ZOO 2700 Lecture Notes - Lecture 20: Arthropod Cuticle, Internal Fertilization, Nephridium
28 Mar 2018
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Document Summary
Ecdysozoa: panarthropoda, tartigrada, onycophora, arthropoda, cycloneuralia, priapulidia, loricifera, kinorhyncha, nematode, nematomorhpa. Nervous system at end part of organism: ring like that wraps around pharynx- morphological features. Sucking pharynx: it can protrude to prey. Very closely co-evolved with their host/prey: elegans. Used to understand animals to solve medical problems. C. elegans are attracted to urine from cancer patients while they shy away from non- cancer samples. 242 samples of urine (24 cancerous) tested. Cancerous samples identified with an accuracy of 96% Apomorphies: lots if capallie, some used for sensory, amphids: sensory; important where the nematods use them as test to detect small molecules in the environment, used for production to find mates and to find food. Cuticle: multiple layers, shed in nematode- outer layer sheds and replaces (ecdysis- moulting) Lipids: compounds that are repelling water- protects water from going out; so organism can live in very dry environments. Phasmids (posterior): might be related to reproduction.
