mollusca part 1 - city college of san francisco · 2009-10-08 · mollusca part 1 polyphacophora...
TRANSCRIPT
![Page 1: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/1.jpg)
1
MOLLUSCA Part 1
PolyphacophoraScaphopodaGastropoda
Phylum Mollusca
Large group of aquatic & terrestrial invertebrates with bilateral symmetry and a body covering called the mantle, commonly with a calcareous shellMost well preserved (except slugs)Most Important group of Fossils (numbers)Organs include heart, stomach, nerve cord, musclesInferred evolution from the Hypothetical Ancestral Mollusc
![Page 2: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/2.jpg)
2
Taxonomy to know
Kingdom AnimaliaPhylum Mollusca
Class Polyplacophora- chitonsClass Scaphopoda-tusk shellsClass Gastropoda-snailsClass Bivalvia-clamsClass Cephalopoda-nautiloids
Class Polyplacophora
Shell with 8 dorsal platesHerbivores, rocky environmentsCambrian to recent
![Page 3: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/3.jpg)
3
Fossil Polyplacophora
Cambrian – disarticulated plates
Ordovician
Class Scaphopoda
Tusk shaped, hollow shell (boat foot)Sandy or silty bottom, shallow water marineOrdovician to RecentSometimes very abundant e.g. Pennsylvanian of Texas
![Page 4: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/4.jpg)
4
Class Scaphopoda
Fossil Scaphopods
![Page 5: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/5.jpg)
5
Class Gastropoda
Stomach footSnails, slugs, whelks, limpets, abaloneHead with eyes, tentacles, broad flat foot, gills or lungsTypically coiled, unchambered shell (some cap-shaped)
coiled around a columella (axial pillar)Apex, whorl, spire, lip (see p. 291)Operculum
Typically aragonite shells that disolve in acid – casts, molds, steinkernsCambrian to Recent
Class Gastropoda
![Page 6: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/6.jpg)
6
Class Gastropoda
Fossil Gastropods
Pliocene Turritella
![Page 7: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/7.jpg)
7
Fossil Gastropoda
Amphiscapha catilloides Penn. Texas
Fossil Gastropoda
Worthenia tabulataPenn. TexasGyrodes genti Cretaceous, England
![Page 8: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/8.jpg)
8
MOLLUSCA Part 2
BivalviaCephalopoda
Taxonomy to know
Kingdom AnimaliaPhylum Mollusca
Class Polyplacophora- chitonsClass Scaphopoda-tusk shellsClass Gastropoda-snailsClass Bivalvia-clamsClass Cephalopoda-nautiloids
![Page 9: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/9.jpg)
9
Class Bivalvia
Class Bivalvia aka Pelecypoda
Shell with two mirror image partsHinge with various designsNo headCambrian to recent
![Page 10: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/10.jpg)
10
Class Bivalvia
Class Bivalvia
![Page 11: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/11.jpg)
11
Class Bivalvia
Fossil Bivalves
Anadara, a bivalve with taxodontdentition from the Pliocene of
Cyprus.
an extinct bivalve from the of Wooster, Ohio (external mold).
![Page 12: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/12.jpg)
12
Class Cephalopoda
Class Cephalopoda
“Head Foot” eyes, tentacles, head well developedIntellegentStraight or coiled shell, usually planispiralOrdovician – Recent1st large group of predators
![Page 13: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/13.jpg)
13
Class Cephalopoda
Ammonites
![Page 14: MOLLUSCA Part 1 - City College of San Francisco · 2009-10-08 · MOLLUSCA Part 1 Polyphacophora Scaphopoda Gastropoda Phylum Mollusca zLarge group of aquatic & terrestrial invertebrates](https://reader034.vdocument.in/reader034/viewer/2022042400/5f0f440d7e708231d4434e3a/html5/thumbnails/14.jpg)
14
Fossil Cephalopod
Fossil Cephalopod