EARLY PALEOZOIC LIFEMetazoan InvertebratesMollusca

Cephalopods

ChamberedNautilus

EARLY PALEOZOIC LIFEMetazoan InvertebratesMollusca

Cephalopods

ChamberedNautilusInternal

ChambersSimple Suture Pattern

EARLY PALEOZOIC LIFEMetazoan InvertebratesMollusca

Cephalopods

Ammonoid Cephalopod

Complex Suture Pattern

EARLY PALEOZOIC LIFEMetazoan InvertebratesMollusca The Cephalopod Eye

EARLY PALEOZOIC LIFEMetazoan InvertebratesMolluscaGastropodsShell and viscera twisted 180 above foot ("Torsion") Shell grows in asymmetrical spiral ("Lateral Coiling") Radula changes form and function in different lineages

•scraping plants•grazing on plants •scavenging animals •hunting animals

Early Cambrian to Recent

EARLY PALEOZOIC LIFEMetazoan InvertebratesMollusca Gastropods

EARLY PALEOZOIC LIFEMetazoan InvertebratesMollusca Gastropods

EARLY PALEOZOIC LIFEMetazoan InvertebratesMolluscaChitons•Ancestor is flattened, elongated •Mantle and shell dominate head, foot •Mantle produces shell in 8 plates •Radula scrapes encrusting vegetation

Late Cambrian to Recent

EARLY PALEOZOIC LIFEMetazoan InvertebratesArthropodaVery large phylumChitinous, external skeletonSegmented bodyPaired and jointed appendagesHighly developed nervous system sensory organs

EARLY PALEOZOIC LIFEMetazoan InvertebratesArthropoda

EARLY PALEOZOIC LIFEMetazoan InvertebratesArthropoda Trilobites

Swimming or crawling arthropodsThree longitudinal segments 2 pleural lobes, axial lobe cephalon, (head), thorax, and pygidium (tail)Flexible skeleton

chitin and CaCO3

Complex eyeEarly Cambrian to late Devonian

extinct at Permian

EARLY PALEOZOIC LIFEMetazoan InvertebratesArthropoda Trilobites

Eye structure

EARLY PALEOZOIC LIFEMetazoan InvertebratesArthropoda Ostracodes

Look like beansSegmented body enclosed in CaCO3 and chitin carapaceMarine and freshwaterUseful in biostratigraphyEarly Cambrian to Recent

EARLY PALEOZOIC LIFEMetazoan InvertebratesArthropoda EurypteridsSwimming or crawling arthropodsSome up to 3 m in length

Ordovician to PermianMostly Silurian and Devonian

EARLY PALEOZOIC LIFEMetazoan InvertebratesEchinodermataSpiny-skinned animalsStarfish, sea urchins sea lilies5 part, radial symmetryEndoskeleton CaCO3 platesWater vascular system tube feet

EARLY PALEOZOIC LIFEMetazoan InvertebratesEchinodermata

EARLY PALEOZOIC LIFEMetazoan InvertebratesEchinodermata

Sessile, benthonic forms common in PaleozoicVagrant, benthonic forms common in Mesozoic and Cenozoic

EARLY PALEOZOIC LIFEMetazoan InvertebratesEchinodermata AsteroideaStarfishOrdovician to Recent

EARLY PALEOZOIC LIFEMetazoan InvertebratesEchinodermata OphiuroideaBrittle StarsOrdovician to Recent

EARLY PALEOZOIC LIFEMetazoan InvertebratesEchinodermata EchinoideaSea UrchinsEarly Cambrian to Recent

EARLY PALEOZOIC LIFEMetazoan InvertebratesEchinodermata Crinoidea

CrinoidsMiddle Cambrian to Recent

EARLY PALEOZOIC LIFEMetazoan InvertebratesEchinodermata Blastoidea

BlastoidsEarly Cambrian to Permian

EARLY PALEOZOIC LIFEMetazoan InvertebratesGraptolithina (Graptolites)

MarinePlanktonic or epiplanktonicSessile benthonicChitin skeletonCambrian to Mississippian?

Good index fossil for Ord-Sil

EARLY PALEOZOIC LIFEMetazoan InvertebratesGraptolithina (Graptolites)

EARLY PALEOZOIC LIFEVertebratesFish

EARLY PALEOZOIC LIFEVertebratesFishAgnatha (Agnathids)Jawless fish

Cambrian to Recent

EARLY PALEOZOIC LIFEVertebratesFishAgnatha (Agnathids)Jawless fish

Astrapis

EARLY PALEOZOIC LIFEVertebratesFishAcanthodii (Acanthodians)Early jawed fishLate Silurian to Permian

EARLY PALEOZOIC LIFEVertebratesFishPlacodermi (Placoderms)Plate-skinned

fishesLate Silurian to

Permian

Bothryolepis

EARLY PALEOZOIC LIFEVertebratesFishPlacodermi (Placoderms)

Dunkleosteus

EARLY PALEOZOIC LIFEVertebratesConodontsChordateResemble teethProterozoic to TriassicCalcium phosphate

EARLY PALEOZOIC LIFEVertebratesConodonts

EARLY PALEOZOIC LIFEVertebratesConodonts