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Cards In This Set
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What is the most common type of fossils found belonging to the Phylum Cnidaria?
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Corals (Class) Anthozoa)
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Name the three orders with the Class Anthozoa.
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Tabulata
Rugosa Scleractina |
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What is the major distinguishing feature of Rugosa corals versus other corals ?
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4 primary septa
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What are the major distinguishing features of Tabulata corals?
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Several individual tubes or coralites all growing from a flat sheet called a tabula.
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What is the major distinguishing feature of Scleractina corals?
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Six (or multiples of six) septa
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What are 3 distinguishing features of the Phylum Cnidaria?
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1. bodies composed of at least two layers
2. A hollow central cavity. 3. Radially symmetrical |
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What are 3 distinguishing features of the Phylum Brachiopoda?
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1. Bivalves
2. filter feeding 3. Bilaterally symmetrical |
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Name two ways to distinguish Brachiopoda shells from Mollusca bivalve shells?
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1. Brachiopoda bivalves are bilaterally symmetrical, Mollusca bivalves are not.
2. Brachiopoda bivalves are nearly always found with both shells locked together. Molusca bivalves are usually found as single shells. |
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What period in history is known as the "Age of the Brachiopods?
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The Silurian period (in the Paleozoic era).
416 -444 Million years ago. |
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Name 2 distinguishing features of the phylum Mollusca?
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1. (Usually) a hard, unsegmented shell
2. A distinctive head and foot. |
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Name the 3 prinicipal fossil classes withing the Phylum Mollusca
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Class Gastropoda
Class Bilvaliva Class Cephalopoda |
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Name the distinguishing feature of animals of the Class Gastropoda within the Phylum Mollusca.
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A trochoidal spiral
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Name the distinguishing feature of animals of the Class Bilvalvia within the Phylum Mollusca.
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Bivalve shells (clamshells) which are the exact mirror image of each other (bilaterally symetrical)
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Name the distinguishing features of animals of the Class Cephalopoda within the Phylum Mollusca.
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Bilaterally symmetrical bodies, head and tentacles
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What are the distinguishing features of the animals in the Subclass of Ammonoidea of the Class Cephalopoda, in the Phylum Mollusca?
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Segmented, coiled shells, uncoiled or planispiral. Except for the earliest examples, these animals had very complex sutures.
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