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1 2004 The Anthropological Society of Nippon

ANTHROPOLOGICAL SCIENCE

Vol. 000, 000-000, 2004

Sivapithecus is east and Dryopithecus is west,and never the twain shall meet

DAVID R. BEGUN1*

1Department of Anthropology, University of Toronto, Toronto, Ontario, M5S 3G3, Canada

Received 26 June 2003; accepted 7 March 2004

Abstract Sivapithecus and Dryopithecus are well-described Miocene hominids (great apes andhumans), both known since the 19th century. Over the years these genera have been combined into one(Dryopithecus) or separated up to the subfamily level. Each have been dismissed as interesting sidebranches, hailed as direct ancestors, or recognized as sister clades to one or more clade of extant hom-inid. Here I argue that they are each stem taxa of the two living hominid clades Ponginae and Homi-ninae. A famous poem by Rudyard Kipling tells the tale of a British and Afghan soldier whosedifferences (in ethnicity) obscure their similarities (in character). The relationship between Sivapithe-cus andDryopithecus is similar. On the one hand, Sivapithecus is restricted to South Asia, has thicklyenameled molars, robust jaws, and superficially baboon-like forelimbs; Dryopithecus is European, hasthinly enameled molars and gracile jaws, with suspensory forelimbs. On the other hand, both are greatapes, both had suspensory adaptations, large brains, and delayed development, and both are closelyrelated to living hominids. Recognition of the likely relations ofSivapithecus and Dryopithecus pro-vides insight into the causes, timing, and paleobiogeography of crown hominid origins.

Key words: hominid origins, Asia, Europe, climate change

Introduction

Sivapithecus is east andDryopithecus is west, and never

the twain shall meet, Till climates change, forests shrink,and hominids retreat. Alas, today they are neither east norwest, on the continents of their birth, Since hominids movedSouth of Cancer from opposite ends of the earth (shame-lessly modified from Rudyard Kiplings The Ballad of Eastand West, The One Volume Kipling Authorized, Double-day, Doran & Company, Garden City, New York, 1928).

Dryopithecus was first described in 1856 from fossilsfound in the foothills of the French Pyrenees, three yearsbefore Darwins publication of On the Origin of Species(Lartet, 1856). Lartet and most subsequent workers in the19th century recognized the great ape affinities of this fossiltaxon, and a number noted the resemblances ofDryopithe-

cus to African apes (e.g. Gaudry, 1890). Sivapithecus wasfirst definitively described by Lydekker (1879), from fossilsfrom the Potwar Plateau of present day Pakistan, though heoriginally named the taxonPaleopithecus [noting thatPale-opithecus is preoccupied, Pilgrim (1910) introduced thenomen Sivapithecus]. Again, a number of researchers,including Lydekker, noted particular similarities to orangu-tans. Kelley (2002) and Begun (2002) review the history ofthese and other Eurasian hominoid discoveries. To make along story short, once hominoids were recovered in Africa

[reviewed recently by Harrison (2002) and Ward and Duren(2002)] it seemed less likely to many researchers that Eur-asian fossil hominoids could be directly related to living

taxa, though many continued to believe that Sivapithecus (orRamapithecus) in particular had a specific relationship tohumans (see Appendix for a classification of the Miocenehominoids discussed here).

In the modern era most researchers now agree thatDryo-pithecus and Sivapithecus are great apes, but there is dis-agreement on their relations to living taxa. Most researchersconclude that Sivapithecus is a sister clade toPongo. A fewresearchers, focusing primarily on differences betweenPongo and Sivapithecus in postcranial anatomy, but also inpart on gnathic differences, have suggested that the fossiltaxon is either a stem great ape or a stem hominoid, withouta direct relationship to Pongo (e.g. Benefit and McCrossin,

1995; Pilbeam, 1997). In my view the case for aPongoSivapithecus clade, reviewed briefly below, is considerablystronger. The relations ofDryopithecus are even less wellagreed upon. A number of researchers also feel thatDryop-ithecus is a stem hominid (Andrews, 1992) or hominoid(Benefit and McCrossin, 1995; Pilbeam, 1997). Others seeDryopithecus as a member of a very diverse Pongo cladethat includes most Eurasian hominids, including Ouranop-ithecus and Oreopithecus (Moy-Sol and Khler, 1993).Finally, some researchers viewDryopithecus as a member ofthe African ape and human clade, along with Ouranopithe-cus, though these researchers disagree on the precise rela-tions among African apes and humans (e.g. de Bonis andKoufos, 1993, 1997; Koufos, 1995; Begun et al., 1997;

Begun, 2001, 2002). I will argue here that most of the mor-

* Corresponding author. e-mail: [email protected]: +1-416-978-8850; fax: +1-416-978-3217

Published online 30 September 2004in J-STAGE (www.jstage.jst.go.jp) DOI: 10.1537/ase.04S008


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2 D.R. BEGUN ANTHROPOLOGICAL SCIENCE

phological evidence ofDryopithecus and Ouranopithecuspoints to a sister clade relationship to African apes andhumans.

Both hypotheses of specific phylogenetic links betweenAsian great apes on the one hand and Afro-European great

apes on the other are also consistent with proposed phyloge-netic relations and paleobiogeographic patterns among otherMiocene to recent Eurasian and African mammals. They arealso consistent with most estimates of divergence dates frommolecular data and suggested patterns of dispersal caused bychanging ecological settings. The combined evidence ofmorphology, functional anatomy, phylogeny (morphologyand molecular), climate change, and paleobiogeographyprovide the basis for a model of modern hominid origins.

Eurasian Hominid Origins

Current evidence suggests that Eurasian hominids and

middle Miocene African hominoids derive from one or moremembers of a group (probably paraphyletic) loosely referredto here as the griphopiths. This includes Griphopithecusfrom Europe and Turkey, and Equatorius (or Griphopithe-cus),Nacholapithecus andKenyapithecus from Kenya. Thecf. Griphopithecus from Engelswies, Germany and Gripho-pithecus alpanifrom Paalar and andr, Turkey are appar-ently the oldest griphopiths, though some uncertaintypersists with regard to the age of the Turkish samples. Ger-man and Turkish Griphopithecus is currently estimated to be~1616.5 Ma (Heizmann and Begun, 2001; Begun et al.,2003). African and Slovakian griphopiths are younger, at~15 Ma (Steininger, 1999; Ward et al., 1999). Africangriphopiths may have evolved from Eurasian Griphopithe-

cus, though the fossil record of middle Miocene hominoidsin Africa is very poor and the possibility that in situ ances-tors existed cannot be dismissed. Griphopiths from allthree continents are united by a suite of derived charactersthat distinguish them from early Miocene hominoids such asProconsul, including large, thickly enameled molars withlow cusps and restricted dentine penetrance, some reductionin cingulum development and frequency, robust jaws, andcertain modifications to the upper incisors. They are distin-guished from Afropithecus in lacking the autapomorphicfeatures of the anterior dentition, premolars, palate, andmandible (Leakey and Walker, 1997). One griphopith,Nacholapithecus, more closely resembles Afropithecus in

having a relatively long and more horizontal nasoalveolarclivus and robust, relatively low-crowned upper canines, butlacks most of the dental features and the deep mandibles ofAfropithecus (Ishida et al., 2004). It may be in the end thatNacholapithecus is more closely related toAfropithecus andis not a griphopith.

Very little is known of the skull of the griphopithsbeyond the gnathic region, but postcranially they are as agroup broadly similar to early Miocene hominoids (Begun,1992, 2002; Benefit and McCrossin, 1995; McCrossin andBenefit, 1997; Nakatsukasa et al., 1998; Ward and Duren,2002). While all of the later-occurring taxa from East Africahave individual postcranial autapomorphies suggestive ofspecialized adaptations [e.g. elongated, robust forelimbs in

Nacholapithecus; indications of terrestriality in Equatorius

(McCrossin et al., 1998; Ishida et al., 2004)], none show anyindication of any type of below-branch quadrupedalism as inextant and late Miocene hominoids.

The principle distinguishing feature of the griphopiths istheir robust gnathic morphology, and this is probably related

to a novel adaptation to exploit a wider range of food typesin the slightly more seasonal environments of the middleMiocene of Eurasia (Heizmann and Begun, 2001). Ampleevidence exists to indicate that the climate changes thatwould lead eventually to the disappearance of tropical andsubtropical ecological settings in most of Eurasia werealready under way at the beginning of the middle Miocene(see below).

Eurasian Hominid Diversity

It is intriguing that the griphopiths have a European,Asian, and African distribution, and it is tempting to con-

clude that this represents the initial separation of both Eur-asian great ape clades and the African ape clade (Figure 1).However there is no evidence for this. Griphopithecusalpanidoes not share any derived character with any lateMiocene hominid, despite tentative suggestions to the con-trary (e.g. Alpagut et al., 1990). Similarly,Equatorius,Ken-yapithecus, and Nacholapithecus do not share specificsynapomorphies with great apes, again despite a few claimsto the contrary (e.g. McCrossin et al., 1998; Ishida et al.,2004). While the nasoalveolar clivus ofNacholapithecus hasbeen interpreted as elongated and overlapping with the max-illary palatine process, resulting as well in some reduction ofthe incisive foramina, other similarities to great apes arelacking. These premaxillary similarities are more parsimoni-

ously interpreted as homoplasies possibly related to theenlarged anterior dentition ofNacholapithecus, apparentlyalso shared byAfropithecus (Ishida et al., 2004). All of thesetaxa are best viewed as broadly ancestral to all hominids.

Because the griphopiths are distributed widely both geo-graphically and temporally, it is not clear exactly when andwhere the two main clades of living hominids evolved (Fig-ure 1). However, by ~12.5 Ma both are established in theirrespective regions, Sivapithecus in Chinji Formation depos-its in the Potwar plateau andDryopithecus from St. Gaudensin France and St. Stefan in Austria (Kappelman et al, 1991;Steininger, 1999). All hominids from the Potwar plateau arecurrently attributed to Sivapithecus (Kelley, 2002), though

the earliest specimens from Chinji are much more poorlypreserved than at later Potwar localities, from which the bulkof Sivapithecus is known. This is interesting becauseAnkarapithecus from Anatolia, of equivalent age to much ofthe Sivapithecus sample (from the Nagri Formation, whichis ~10 Ma and occurs in the middle of the Potwar hominidsequence) is related to Sivapithecus but lacks key derivedcharacters and is thus excluded from the SivapithecusPongo clade (Alpagut et al., 1996; Begun and Gle, 1998;Kappelman et al., 2003). It is possible that the SivapithecusAnkarapithecusPongo clade evolved somewhere in theeastern MediterraneanSouth Asian area and dispersedwithin the region into a number of taxa. If Chinji (the oldest)hominids are the ancestors of this radiation, then they would

have to be a different genus from Sivapithecus andAnkarap-


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ASIAN AND AFRICAN GREAT APES DIVERGED IN EURASIA 3Vol. 112, 2004

ithecus, its putative descendents (Begun and Gle, 1998).Only more complete fossils from Chinji age deposits cananswer this problem.

The origins ofDryopithecus are similarly murky. The old-est specimens ofDryopithecus are roughly the same age asSivapithecus, though this is based on less reliable evidence

from relatively small faunal samples. Middle MioceneDry-

opithecus is known from Spain (Can Vila, Can Mata, Castelde Barbera), France (St. Gaudens, La Grive), and Austria(St. Stefan), all of which are dated mainly on the basis of theabsence of typical late Miocene taxa [true mice (murids) andthree-toed horses (hipparionines)]. These localities are usu-

ally attributed to the European land mammal biochronologiczone known as MN 7/8, which is correlated to localitiesdated between about 14 and 11.5 Ma (Steininger, 1999).Thus they are roughly contemporaneous with earliest Sivap-ithecus, though they could be a bit older or younger. As withSivapithecus,Dryopithecus radiates in situ into at least fourspecies distributed from Spain in the west to Hungary andpossibly Georgia in the east [the possibility ofDryopithecusin East Asia exists but is currently unsubstantiated (Kelley,2002)]. In the late Miocene, hominids diversify at thegeneric level in both Europe and Asia. Between about 10and 7 Ma, Sivapithecus radiates into a diversity of taxa inAsia andDryopithecus does the same in Europe. Ouranop-

ithecus appears in Greece and possibly Anatolia betweenabout 9.5 and 78 Ma, possibly as a derived member of theDryopithecus clade (see below). Oreopithecus may be a partof the same radiation (Harrison and Rook, 1997), though inmy view this late Miocene taxon is a distinct clade (Begun,2002). Sivapithecus apparently shares an ancestry withGigantopithecus and Lufengpithecus. Gigantopithecus is aproblematic taxon because it is known only from lower jawsand isolated teeth, the large size of which make them looksimilar. It is quite possible that this includes more than onegenus, one represented by the Miocene specimens (Giganto- pithecus giganteus) and the other by Pleistocene fossils(Gigantopithecus blacki). Once again, more and better pre-served specimens are needed.Lufengpithecus is represented

by large samples from Yunnan Province, China, that provideevidence of a distinctive cranial morphology in combinationwith dental and postcranial similarities toPongo (Schwartz,1997; Kelley, 2002; personal observations). Because Sivap-ithecus more closely resemblesPongo in facial morphologywhileLufengpithecus more closely resemblesPongo in den-tal morphology, the relations among these taxa are not com-pletely clear, though most researchers agree that all aremembers of the same clade.

Eurasian Hominid Phylogeny

Europe

As noted earlier, relations among European middle andlate Miocene hominids and between them and living homi-nids are currently debated. Rather than reviewing this litera-ture here [it is reviewed in Begun (1994, 2001, 2002), Begunand Kordos (1997), and Kordos and Begun (2001b)] I willsimply review the evidence that supports the conclusions mycolleagues and I have reached concerning European homi-nids.

In an analysis of 240 characters in fossil and living homi-noids (Begun et al., 1997), more recently expanded to 247characters (Begun, 2001), we found thatDryopithecus aloneor Dryopithecus and Ouranopithecus together are sisterclades to the African apes and humans. The numerous char-acters that represent synapomorphies of the great

apes + Dryopithecus and African apes + Dryopithecus

Figure 1. Paleobiogeography of late early to early middle Miocenehominoids. (A) In the Karpatian, hominoids enter western Eurasiabefore the Langhian transgression temporarily stops land mammalmigrations between Eurasia and Africa. The source may have beenEast Africa (Afropithecus) or Saudi Arabia (Heliopithecus). The earlierhominids (griphopiths) first appear in Europe east of the Rhine gra-ben (dotted line) and in Anatolia. (B) After the Langhian (Badenian)

griphopiths spread and have thus far been recovered in Slovakia andEast Africa. Sometime toward the end of this initial dispersal periodthe clades of living hominids emerged. Pongines may have evolvedfrom western Eurasian ancestors while hominines may have evolvedin situ in the west. In this and in Figure 3 the shaded areas representexposed land surfaces as reconstructed by Rgl (1999).


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clades are listed in Table 1. Using a smaller number of char-acters from a restricted anatomical region (20 features of theface), three features have been used to suggest that Dryop-ithecus is more closely related to Pongo (Moy-Sol andKhler, 1995). The problem here, beyond their very small

number, is that these characters are actually variable inDry-opithecus (Hungarian Dryopithecus differs in all of thesefeatures from SpanishDryopithecus), or they are based on areconstruction that can be interpreted differently (Begun andKordos, 1997; Kordos and Begun, 2001b). So they do notcharacterize most knownDryopithecus crania. Furthermore,all of these characters are known to be variable, and thus ofunpredictable phylogenetic significance in hominids gener-ally (Eckhardt and Eckhardt, 1995; Msuya and Harrison,1996).

Among the most important apparent synapomorhies of theAfro-European great ape clade are the morphology of thetemporal bone, the premaxilla and the basic architecture of

the cranium. Although the temporal bone ofOuranopithecusis not known, in Dryopithecus the tympanic and articularportions are fused, the entoglenoid process is strongly devel-oped, and the glenoid fossa is relatively deep. These aredetailed developmental and morphological features sharedwith African apes and humans in a region that has beenfound to have a strong phylogenetic signal in hominids(Brown and Ward, 1988). A new specimen ofDryopithecusfrom Rudabnya, Hungary shows clearly for the first timethat the face of this taxon is klinorhynch, or ventrallyrotated, as in African apes and humans. While it is less wellpreserved, the cranium ofOuranopithecus was probably kli-norhynch as well (Begun, 1994; Begun and Kordos, 1997;Kordos and Begun, 2001b). Ventral rotation of the face rela-

tive to the neurocranium in African apes has been related tothe development of the supraorbital structures (supraorbitaltori/supratoral sulci), both of which are also more stronglydeveloped in Dryopithecus and Ouranopithecus than inother Miocene apes, though less strongly developed than inAfrica apes and most humans (Shea, 1988; Begun, 1994).

Finally, three specimens from Rudabnya preserve partialpremaxillae and anterior nasal fossae, all indicating the pres-ence of a stepped subnasal fossa and a true incisive canal(Begun, 1992, 1994; Begun and Kordos, 1997; Kordos andBegun, 2001b). All three specimens (RUD 12, RUD 44/47,and RUD 200) are damaged in this region, but together agood picture of the morphology of the region emerges, espe-

cially in light of newly recovered fragments and teeth thatare associated with RUD 44/47 (Kordos and Begun, 2001a;Begun, 2002). The Dryopithecus fossil evidence in itsentirety has not been considered in previous interpretationsof this region (e.g. Ward and Kimbel, 1983; Ward and Pil-beam, 1983; McCollum and Ward, 1997). While other fossiltaxa have been said to demonstrate a stepped subnasal fossaor an elongated premaxilla, none other than Dryopithecusand Ouranopithecus among Miocene apes has the full suiteof features that typify this region in living African apes andin australopithecines. For example, Afropithecus andNacholapithecus have moderately elongated premaxillae butones that are relatively horizontal, labiolingually com-pressed with little or no overlap with the palatine process.

Afropithecus has the typical mammalian pattern of a fenes-

trated palate, as inProconsul[the premaxilla separated fromthe palatine process by a foramen (fenestra) rather than acanal (Schwartz, 1983)]. In Nacholapithecus there is moreoverlap with the maxilllary palatine process, but the overallconfiguration is nonetheless similar toAfropithecus (Ishida

et al., 2004). In African apes and humans,Dryopithecus, andOuranopithecus the nasoalveolar clivus region consists of anelongated premaxilla that is thick labiolingually and bi-con-cave labially. It overlaps to varying degrees with the palatineprocess of the maxilla but is vertically displaced and not incontact with the palate in the midline, thus contributing to astep into the nasal fossa. Gorilla,Dryopithecus, and Ouran-opithecus have relatively short premaxilla and limited over-lap with the palatine process while Pan andAustralopithecus have more elongated premaxilla with moreextensive overlap. The former condition has been inter-preted as primitive for the African ape and human clade(including the Eurasian fossil taxa) and the latter a synapo-

morphy of thePanhominin clade (Begun, 1992, 1994).The remaining synapomorphies of the Afro-Europeanhominid clade are too numerous to summarize here (Table1). It is simply worth noting that these features come frommany regions of the cranium, as do the synapomorphies ofthe great apes found in Dryopithecus. It seems highlyunlikely that they are all functionally or structurally interre-lated (though some may be), and more likely that most rep-resent distinct evolutionary transformations. Given theirnumber and diversity it is therefore very unlikely that allappear in parallel in European and African taxa.

AsiaA comprehensive review of the evidence for an Asian

great ape clade is beyond the scope of this paper, especiallysince several recent reviews are available (Ward, 1997;Kelley, 2002). I touched earlier on the possible relations

Table 1. Great ape and African ape cranio-dentalcharacter states ofDryopithecus

Great ape character states African ape character states

Labiolingually thick incisors Bi-convex premaxillaCompressed canines Stepped subnasal fossa Elongated premolars and molars Patent incisive canalsM1 = M2 Broad, flat nasal aperture base

No molar cingula Shallow canine fossa Reduced premolar cuspheteromorphy

Supraorbital torus

High root of the zygomatic Inflated glabellaElongated midface Frontal sinus above and below

nasionBroad nasal aperture

below the orbitsProjecting entoglenoid process

Reduced midfacial prognathism Fused articular and tympanictemporal

Elongated, robust premaxilla Broad temporal fossaPremaxillapalatine overlap Deep glenoid fossaShallow subarcuate fossa Elongated neurocraniumEnlarged semicircular canals Moderate alveolar prognathismLarge brain KlinorhynchyHigh cranial base

Modified from Kordos and Begun (2001b).


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among Sivapithecus, Ankarapithecus, Lufengpithecus, andGigantopithecus (see Figure 2). I will focus briefly on someproblem areas.

Sivapithecus is widely believed to be the sister taxon toPongo (Pilbeam, 1979, 1982; Andrews and Cronin, 1982;Ward and Pilbeam, 1983; Kelley and Pilbeam, 1986; Brownand Ward, 1988; Andrews, 1992; Ward, 1997; Kelley, 2002).

Disagreement comes from two main sources. On the onehand, certain aspects of the morphology ofSivapithecus aredistinctly unlike that ofPongo. On the other hand, for someof these anatomical regions fossils more closely resemblingPongo are known. From the perspective of larger patterns ofdispersals and origins discussed here there are two importantquestions that arise from these objections. Are any of theAsian fossil great apes specifically related toPongo and ifso, which clade is the most likely sister taxon?

Most of the researchers cited above have noted that theface ofSivapithecus is remarkably similar to that ofPongoin many details of the premaxilla, subnasal fossa, anteriornasal and periorbital regions, temporal bone morphology,

dental implantation, and various aspects of dental propor-tions. However, most of these authors and others who havedescribed this material (e.g. Pilbeam et al., 1980; Kelley,1988; Brown, 1997) also note that Sivapithecus gnathic mor-phology is generally more robust, particularly the mandibleand zygomatic, than in similarly sized Pongo (only thelarger specimens of Sivapithecus fall within the range ofPongo, and even here they are for the most part within thefemalePongo range). The canine crowns tend to be shorterand more robust and the postcanine dentition is large, thicklyenameled with broad, low, rounded cusps, shallow basins,and low dentine penetrance. This suite of characters hasbeen related by many authors to powerful mastication (e.g.Kay, 1981) and in fact occurs in many living and extinct pri-

mate clades (Begun, 2001, 2002). In the case of the homi-

nids it is almost certainly the primitive condition, beingfound in the griphopiths and to some extent in earlierclades (e.g. Afropithecus), though it recurs periodically(Ouranopithecus,Australopithecus, Gigantopithecus). Thusit is not too surprising that Sivapithecus may retain a numberof primitive features while sharing other characters withPongo, an example of one of the most commonly observed

phenomena in paleobiology, mosaic evolution.Other apparent homoplasies are more difficult to explain.

Several authors have noted that Sivapithecus lacks a numberof postcranial characters present in Pongo. While some ofthese can also be attributed to the fact that Pongo and itsancestors have experienced millions of years of selectionsince Sivapithecus (e.g. the absence of a fovea for the liga-mentum teres of the femur inPongo), others are not so easilydismissed as mosaic evolution. In particular, the upper fore-limb morphology ofSivapithecus is said to be too primitivefor the taxon to be related toPongo (Benefit and McCrossin,1995; Pilbeam, 1996, 1997). This is based primarily on theobservations that the proximal half of the shaft of the

humerus in Sivapithecus is retroflexed or bent posteriorlyand distally (concave posteriorly), as in early Miocene hom-inoids, monkeys, and indeed most mammals (Pilbeam et al.,1990; Rose, 1997; Madar et al., 2002). The region is alsocharacterized by a very strongly developed platform for theinsertion of the pectoralis major and deltoideus muscles. Incontrast, the proximal humerus ofDryopithecus and all otherhominids is anteroflexed (smoothly concave anteriorly), orstraight, depending on the taxon. The humeral morphologyofSivapithecus has impressed many researchers for a num-ber of good reasons. Sivapithecus is uniquely different fromall other hominids; it appears to share a morphology withmost other mammals; this morphology of the humerus isassociated with a fundamental aspect of behavioral ecology

(retroflexed humeri are associated with pronograde quadru-

Figure 2. Phylogenetic relations and geographic distribution of some of the taxa discussed in the text. To save space, Griphopithecus repre-sents the griphopiths Griphopithecus , Equatorius, Kenyapithecus, and Nacholapithecus.


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peds and anteroflexed humeri with suspensory hominoids).These considerations have led some to question the phyleticlink between Sivapithecus and Pongo (e.g. Pilbeam, 1997;Larsen, 1998).

There is a risk here of throwing the baby out with the bath

water. Anatomical complexes that contribute in an inte-grated fashion to specific adaptations (i.e. suspensory posi-tional behavior) can be modified with various charactersdecoupled from others in response to specific selective pres-sures. Good examples include the australopithecine hip andthe hip of Pleistocene to recent Homo. Both are clearlyadapted to bipedalism and thus integrated tightly to numer-ous other postcranial attributes, but both are easily distin-guished from one another (Lovejoy, 1974; Stern andSusman, 1983). Differences in the paleobiology of eachtaxon accounts, at least in part, for dramatic differences in apart of the anatomy that is otherwise critical to the normalfunctioning of an essential aspect of their adaptation. If one

were to predict that a fossil with a chimpanzee-sized femoralhead could not have been from a biped, one would be wrongin the case ofAustralopithecus despite strong correlationsand good biomechanical arguments. We know this becausewe have a relatively good knowledge of the anatomy of thehip ofAustralopithecus. We do not have a good knowledgeof the shoulder of Sivapithecus. The proximal humerus ofSivapithecus, like the proximal femur ofHomo, may havebeen modified in response to selection for a biomechanicallydifferent form of an otherwise similar positional behavior,antipronograde quadrupedalism, without losing the adapta-tion entirely.

In the end, Sivapithecus has more hominid-like postcra-nial attributes than not, and those, primarily of the proximal

humerus, that are non-hominid like are probably autapomor-phies of that genus, and have no bearing on the issue of itsrelationship toPongo (Begun et al., 1997; Rose, 1997). Par-simony and an appeal to other examples in the hominoid fos-sil record both support the phylogeny depicted in Figure 2.

For the purposes of this paper it is not necessary to resolvethe issue of which Asian late Miocene hominid is mostclosely related toPongo. Recent discoveries ofLufengpithe-cus in Thailand with postcanine teeth more closely resem-bling those of Pongo may help resolve this debate(Chaimanee et al., 2003), especially when cranial and post-cranial material is recovered. Despite the fact that Pongo,Lufengpithecus from China, and cf. Lufengpithecus from

Thailand share complexly crenulated molar occlusal sur-faces, the faces of Sivapithecus and Pongo much moreclosely resemble one another than do the faces ofPongo andLufengpithecus. As with European hominids, it seems thatthere is great diversity in this radiation of Asian great apes.Sivapithecus is more likely to be the sister clade toPongo. Itcould be that attributes characteristic ofPongo inLufeng-pithecus and cf. Lufengpithecus are emergent in the mor-phology or development of the postcanine dentition of thisclade (they occur occasionally in Sivapithecus as well),providing a plausible explanation for the homoplasticappearance of this feature.

Eurasian Hominid Dispersals and Extinctions

The phylogeny depicted in Figure 2 has implications forthe origin of the modern clades of the great apes andhumans. Cladistic relations among Eurasian and African

extinct and living hominids suggest that African hominidsderive from a European ancestor andPongo derives from anAsian ancestor (Begun, 1994, 2001; Begun et al., 1997).This view has been supported by genetic evidence (Stewartand Disotel, 1998) and criticized based on differences ininterpretations of phylogeny discussed above and on per-ceived limitations of the fossil record. With regard to the lat-ter, it has been noted that Africa is huge and barely sampled,especially in the late Miocene, but a large number of lateMiocene localities are in fact known, many preservingpaleoecological indications of forested settings (Begun,2001). The hypothesis that African hominids originated inEurope or western Asia is not based simply on the absence

of evidence from Africa. It is based on two phylogeneticconclusions. Firstly, the hominine clade is present in Europein the late Miocene (Begun et al., 1997; Begun, 2001). Sec-ondly, the few contemporaneous hominoids from Africa arenot cladistically hominid (Begun, 2001). Otavipithecus isclearly primitive (Begun, 1994; Singleton, 2000). Sambu-rupithecus superficially resembles gorillas in a few aspectsof molar morphology but retains many primitive dental andmaxillary characters (Begun, 2001). The isolated teeth fromNgorora have been described as having affinities primarilywith the Proconsuloidea or middle Miocene East Africanhominoids (e.g. Equatorius) (Hill and Ward, 1988; Begun,2001; Hill et al., 2002).

Even if the absence of the hominine clade in Africa before

the latest Miocene represents a sampling bias, why is itpresent in Europe? If European hominids are not related toAfrican hominids, then why do they share so many charac-ters with African hominids? These may be homoplasies, butas noted above this is highly unlikely. In other words, Eur-asian late Miocene hominids are most reasonably interpretedas hominids: those from Europe are stem hominines (Afri-can apes and humans), and the Asian late Miocene hominidsare stem pongines (Pongo). It is on this basis that I wouldexplain the fact that a crown hominid (related to both Afri-can and Asian hominids) has not yet been found in Africa.On the other hand it may well be that the Afro-Europeanhominine clade was widely distributed across Europe, west-

ern Asia, and Africa, but that up until now they have onlybeen found in Europe. It is certainly possible that new fossildiscoveries will show that the African ape and human claderemained in part in Africa; that the clade expanded intoEurope but a core remained in Africa; and that in the endEuropean hominines went extinct and African taxa, cur-rently unknown, are the true ancestors of the African ape andhuman clade.

I have suggested that hominids moved south from Eurasiain response to global climate changes that produced moreseasonal conditions in Eurasia toward the end of theMiocene [Begun (2001) based in part on Quade et al. (1989),Leakey et al. (1996), Cerling et al. (1997) and many others].This scenario seems to hold up reasonably well in the east.

Whichever Miocene taxon is ultimately related toPongo, all


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occur north of the current range of the living taxon, consis-tent with a climatic change that made it more challenging forhominids to live north of the Tropic of Cancer. In the west, ifhominines originated in Europe or western Asia, the paleo-biogeographic model is consistent with that from East Asia;

they moved south at the end of the Miocene as well. If anunknown core of hominines has yet to be found in Africa,this model needs revision to account for the origin of thehominines (Figure 3).

Corroborating evidenceAmple evidence now exists for a gradual degradation in

climate throughout much of Eurasia in the late Miocene,which with additional factors, mainly tectonic, culminated inthe development of markedly more seasonal conditions anda number of dramatic ecological changes. The most spectac-ular in the Miocene is the Messinian salinity crisis that led tothe dessication of the Mediterranean basin at the end of the

Miocene (Hs et al., 1973; Clauzon et al., 1996; Krijgsmanet al., 1999). Other consequences include the developmentof Asian monsoons, desertification in North Africa, the earlyphases of Neogene polar ice cap expansion and the expan-sion of North American grasslands (Garcs et al., 1997;Hoorn et al., 2000; Zhisheng et al., 2001; Griffin, 2002; Guoet al., 2002; Janis et al., 2002; Liu and Yin, 2002; Wilson etal., 2002). In both Europe and Asia subtropical forestsretreated and were increasing replaced by more open coun-try, including true grasslands and steppes (Bernor et al.,1979; Bernor, 1983; Fortelius et al., 1996; Cerling et al.,1997; de Bonis et al., 1999; Magyar et al., 1999; Solouniaset al., 1999; Fortelius and Hokkanen, 2001). It is importantto note that in some places forests persisted and elsewhere

more severe changes occurred, creating a number of refugia,some of which continued to host hominids well into theperiod of climatic deterioration. This is the case for theOreopithecus localities of Tuscany and Sardinia (Harrisonand Rook, 1997). Other well known localities such as Dorn-Drkheim in Germany retained a strongly forested characterthough they lack hominoids (Franzen, 1997; Franzen andStorch, 1999).

For the most part though, hominids disappeared fromEurope and western Asia in the late Miocene, but not all atonce. There is a gradient of extinctions of forest forms fromwest to east, corresponding to the gradient of appearance ofmore open country faunas from west to east (Bernor et al.,

1979; Fortelius et al., 1996; Begun, 2001). Between about12 and 10 MaDryopithecus disappeared from localities inEurope, becoming very rare by 9.5 Ma in Spain and Ger-many, and there represented only by one or two specimens.This is despite the persistence locally of apparently suitableecological settings such as at Dorn-Drkheim (Franzen,1997). This wave of extinctions ends coincident with animportant faunal event in western Europe known as the mid-Vallesian event, when a major turnover of terrestrial faunasled to the widespread extinction of local taxa generallyattributed to the development of more open conditions(Moy-Sol and Agust, 1990; Fortelius et al., 1996). Theyoungest specimens possibly attributable to Dryopithecusare so far east that they are actually Asian, though still west

ofSivapithecus localities. These teeth are currently assigned

to Udabnopithecus from the 88.5 Ma locality of Udabno inGeorgia (Gabunia et al., 2001).

In the eastern Mediterranean hominids persisted to theend of this time period and perhaps somewhat beyond.Ouranopithecus in Greece is mainly known from the end ofthe hominid reign in Europe, and may be a terminal taxon of

theDryopithecus clade (Begun and Kordos, 1997). In Ana-

Figure 3. Paleobiogeography of late Miocene hominids. (A) Atthe end of the middle Miocene into the late Miocene hominines diver-sify in western Eurasia and pongines in South and East Asia, whilehominids in Africa become extinct. The one exception to the title ofthis paper may be in central Anatolia (doubled ended arrow) where

one clade of pongine (Ankarapithecus) appears after the earliestappearance of the clade in South Asia, though in fact no hominines areknown from Anatolia at this time. (B) After ~9 Ma hominids progres-sively go extinct in most of Eurasia, starting in the west and movingeast. During this time hominines first appear in Africa, and probably inSoutheast Asia as well.


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tolia at the eastern edge of the faunal province that includesGreece and the eastern Mediterranean [the Greco-Iranianprovince (de Bonis et al., 1999)] a new, very large hominidresembling Ouranopithecus may be as young as 78 Ma inage (Sevim et al., 2001). During this time, forest taxa were

increasingly replaced by more open country forms. This istrue of virtually all mammalian orders. Among the primates,hominoids declined and cercopithecoids were on theincrease (Andrews et al., 1996). Grazing ungulates andgrassland or dry ecology adapted micromammals alsobecome more common (Fortelius et al., 1996; Agust et al.,1999; de Bonis et al., 1999; Solounias et al., 1999).

The dispersal of late Miocene faunas between Eurasia andAfrica is complex and has intercontinental sources. Thoughthe dominant signature was the rise of open country taxa,forest forms persisted and dispersed as well, including hom-inids. Among the more open country forms horses dispersedfrom North America to the Old World, and modern bovids

and giraffids appear to have dispersed from Europe to Africa(Dawson, 1999; Solounias et al., 1999; van der Made, 1999;Agust et al., 2001). Among the more closed-setting mam-mals, hippos moved from Africa to Europe, and pigs of vary-ing ecological preferences moved from Asia to Europe andAfrica (Fortelius et al., 1996; van der Made, 1999). Smallcarnivores (mustelids, felids and viverrids), larger carni-vores (ursids, hyaenids), porcupines, rabbits, and chalico-theres, most of which also prefer more closed settings, alsodispersed from Eurasia to Africa (Leakey et al., 1996; Gins-burg, 1999; Heissig, 1999; van der Made, 1999; Winkler,2002). In sum, phylogenetic analysis suggests that the ances-tors of many African mammals had appeared in the Valle-sian of Eurasia. Ecologically many of these new taxa were

adapted to more open country conditions (hypsodonty, cur-soriality, etc.), but faunal exchanges among the three OldWorld continents also involved forest or wetter ecologyforms (hippos, some suids, primates, carnivores, rodents,and chalicotheres), which is consistent with the evidence ofclimate change at that time. Many taxa dispersed south intoAfrica as conditions continued to deteriorate, leading to theMessinian crisis; among these taxa were probably the ances-tors of the African apes and humans. While the scenario thatwould have hominid ancestors leave Africa in the earlyMiocene only to return to Africa as hominines in the lateMiocene may seem unnecessarily complicated, this is pre-cisely what seems to have occurred in several mammalian

lineages, including those represented by late Miocene Afri-can species of Orycteropus, several small carnivores, thehippoHexaprotodon, and possibly the proboscideansAnan-cus, Deinotherium, and Choerolophodon (Leakey et al.,1996; Ginsburg, 1999; Heissig, 1999; van der Made, 1999;Boisserie et al., 2003; Werdelin, 2003). This number is likelyto increase as our knowledge of fossil mammal lineagesexpands. Finally, one could well ask how Dryopithecus, asubtropical forest great ape, or Ouranopithecus, a massive-jawed, more open woodland great ape could have made it toAfrica to evolve into the thinly enameled ancestors ofhumans such as Ardipithecus [although there are severalcandidates for earliest human, a discussion of which isbeyond the scope of this paper, Ardipithecus ramidus is in

my view the only taxon with clear and unambiguous affini-

ties to later hominins (Begun, 2004)]. They did not.Dryo-pithecus and Ouranopithecus are sister taxa to the ancestorof the African ape and human clade. The actual last commonancestor of that clade is not known. However, the distribu-tion of characteristics of modern and fossil hominines sug-

gests that this last common ancestor would most likely havebeen woodland or forest dependent and but strongly terres-trial, that is, a knuckle-walker (Richmond et al., 2001).

Conclusions

The phylogenetic divide between Asian and Afro-Euro-pean great apes is deep. The east and west have been sepa-rated for at least 1416 Ma. On the other hand, both lineagesresponded in similar ways to the changing ecological set-tings of late Miocene Eurasia. Both for the most partremained true to their forest ecology origins, and bothmoved south as the forests retreated in that direction.

Acknowledgments

I am grateful to the organizers of the international sympo-sium Asian Paleoprimatology: Evolution of the TertiaryPrimates in Asia for inviting me to participate and to theeditors of Anthropological Science for producing this spe-cial volume. Special thanks go to Masanaru Takai as editorof this special volume for all his hard work. I am also grate-ful to Masato Nakatsukasa and an anonymous reviewer forthoughtful comments that improved this manuscript.

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Appendix. Classification of hominoids included in this analysis

HominoideaEohominoidea

Proconsulidae

ProconsulAfropithecidae

AfropithecusHeliopithecus

Eohominoidea indet. (griphopiths)Griphopithecuscf. Griphopithecus

EquatoriusNacholapithecusKenyapithecus

EuhominoideaHominidae

HomininaeDryopithecusOuranopithecus

PanGorilla

HomoPonginae

SivapithecusLufengpithecusPongoGigantopithecus

Ankarapithecus

Not all possible ranks are named here. The ranks Eohominoideaand Euhominoidea, hominoids of primitive and modern aspect,respectively, are informally used here. See text.

anthropological science vol. 000, 000-000, 2004

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