Exam 2 Review

Exam 2 Review - 1 Pseudocoelomate animals Pseudocoelom...

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1. Pseudocoelomate animals Pseudocoelom Organ-system level of organization Bilateral symmetry Hydroskeleton Dioecious Nematode characteristic shape and movement due to longitudinal muscles only “New evolution” – body cavity partially lined with mesoderm Complete digestive tract Cuticle – secreted, collagenous and flexible Usually parasitic Phylum nematoda – round worms Ascaris, hookworm, pinworm, C. elegans Phylum Rotifera – rotifers Philodina, ciliated corona (crown) for locomotion, mastax – muscular bulb structure for jaw system, foot – on posterior end with toes 2. The molluscs and Annelids Phylum Mollusca Head, foot, visceral mass, and mantle Head – absent in bivalvia, radula (tongue-like) Mantle - protect visceral mass, excrete shell True coelom Organ system level of organization; triploblastic, protostome o Class Gastropoda – “stomach foot”, have one valve ex. Snails, slugs, conchs, whelks Bilateral sym., torsion
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Exam 2 Review - 1 Pseudocoelomate animals Pseudocoelom...

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