Animal Phylogeny Traits (BIO 181 Exam 3)

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11 Terms

1
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What is the outgroup of the animal phylogeny?

Choanoflagellates

2
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What main characteristic separates the organisms in the ingroup from the outgroup?

Multicellularity

3
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How does porifera differ from all other animals?

They lack tissues due to a differing cell type

4
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Which are the first organisms to exhibit tissue layers, and as such, have only two tissue layers, diploblastic?

Cnidaria and Ctenophora

5
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Which organisms exhibit three tissue layers and are therefore, triploblasts?

All organisms after Cnidaria and Ctenophora

6
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Which organisms have no coelom (acoelomates)?

Platyhelminthes (flatworms)

7
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Which organisms have a true coelom?

Annelida (ring worms), Mollusca, Arthropoda, Echinodermata, Chordata

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Which organisms have a pseudocoelom?

Rotifera (wheel animals) and Nematoda (roundworms)

9
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Which organisms exhibit radial symmetry?

Cnidaria (jellyfish), Ctenophora (comb jellies), Echinodermata (sea stars, sea urchins)

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Which organisms exhibit bilateral symmetry?

all other organisms except Cnidaria, Ctenophora, Echinodermata

11
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Which organisms exhibit segmentation?

Annelida, Arthropoda, Chordata