BIOL 2P92 Lecture 1: March 15, 2017
22 Mar 2017
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Document Summary
Known for living on back of whales. Homology of segments (each segment has a set of legs that are highly modified for different functions: walking legs, legs with claspers (hands), appendages that are mouth parts, legs that are swimmerets (used for locomotion swimming) Cephalothorax and abdomen (main tagmata: rostrum protective eye covering. Well-developed circulatory (partially closed) and digestive system. Stores waste products in the bladder to be ejected. Statolith mineral formation (sometimes made up of sand they gather) that sits in a cup with sensors: when statolith moves around, the cilia on cells sends a signal to the brain (attached) on locomotion. Some have indirect development (different larval stages from the adult stages) Identifiable at its mysia stage, differentiated at post-larval stage. Tiny shrimp; important food items for whales, fish, and other animals. Crustaceans are the sister group to the hexapods: crustaceans could possibly be a paraphyletic group. Hormonal control: controlled by brain activity, hormone controlled: ecdysone and juvenile hormone.
