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Chapter 32

Chapter 32 - Chapter 32 Protostome Animals 32.1 What is a...

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Chapter 32: Protostome Animals 32.1 – What is a Protostome? o Mesoderms are found in the two main triploblastic clades – protostomes and deuterostomes o Protostomes develop mouth first o Deuterostomes develop anus first o Protostomes are Bilaterally symmetrical Has an anterior brain that surrounds the entrance to the digestive tract Has a ventral nervous system that has longitudinal nerves o Lophotrochozoans have a feeding structure known as a lophophore and free licing larva known as trochophores o Lophophores are u shaped rings with cilia and hollow tubes fo food consumption and gas exchange o Lophophorates are usually sessile as adults- they attach to rocks o Trochophores move with cilia o Some Lophotrochozoans exhibit radial cleavage o Ecdysozoans have cuticles which are secreted by the epidermis o They shed the cuticle by molting o Some cuticles are chitinous and serve as exoskeletons o Arthropods that keep the cuticle have adapted appendages to facilitate movement o Arrow worms retain developmental synapomorphies of triploblasts o No circulatory system, waste and materials moved via coelome 32.2 – What features distinguish the major groups of lophotrochozaons?
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