Animal Phylogeny Traits (BIO 181 Exam 3)
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11 Terms
What is the outgroup of the animal phylogeny?
Choanoflagellates
What main characteristic separates the organisms in the ingroup from the outgroup?
Multicellularity
How does porifera differ from all other animals?
They lack tissues due to a differing cell type
Which are the first organisms to exhibit tissue layers, and as such, have only two tissue layers, diploblastic?
Cnidaria and Ctenophora
Which organisms exhibit three tissue layers and are therefore, triploblasts?
All organisms after Cnidaria and Ctenophora
Which organisms have no coelom (acoelomates)?
Platyhelminthes (flatworms)
Which organisms have a true coelom?
Annelida (ring worms), Mollusca, Arthropoda, Echinodermata, Chordata
Which organisms have a pseudocoelom?
Rotifera (wheel animals) and Nematoda (roundworms)
Which organisms exhibit radial symmetry?
Cnidaria (jellyfish), Ctenophora (comb jellies), Echinodermata (sea stars, sea urchins)
Which organisms exhibit bilateral symmetry?
all other organisms except Cnidaria, Ctenophora, Echinodermata
Which organisms exhibit segmentation?
Annelida, Arthropoda, Chordata
Note 
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