Geology lab final- Phylum memorization

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Last updated 8:06 PM on 4/25/26
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8 Terms

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Mollusca

Bivalves (hinged shells), Gastropods (snails), Cephalopods (coiled or straight shells with internal chambers)

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Arthropoda

 exoskeletons divided into segments, jointed appendages. Key fossil group is Trilobites

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Echinodermata

show five-fold symmetry. Includes sea urchins, starfish, crinoids

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Brachiopoda

  • similar to bivalves, with symmetry between the two shells rather than across 

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Cnidaria

corals (solitary and colonial) that form calcareous skeletons

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Bryoza

small, moss-like colonial organisms

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Porifera

sea sponges, asymmetrical, solitary, pores, spicules

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Hemichordata

graptolites, colonial, asymmetrical