ZOO 2700 Lecture 28: Lecture 28
28 Mar 2018
School
Department
Course
Professor
Document Summary
Pyloric cecum: bind end of the digestive system: sacs that can retain food for long periods of time. Madreporite: opening to allow to control the water throughout the system. Muscles can move the tube feet back and forth: can expand/contract foot. Tube feet: walk around, capture prey, break open scallops. Perivisceral- including the discs and tube feet of the arms: 3. Can go from food rich environments to food poor areas: go into starvation mode and preserve gonatal tissue, can"t reproduce but can keep themselves alive. Produce up to 2. 5 million gametes per spawn. Asexual: can occur in both larva and adult. Only need 1/5th of the disc to regenerate arm. Larval: can produce little tiny tissue pieces called buds that go through stages and become larva. Test: hard shell of sea urchin; bunch of fused ossicles- connected with each other to form a rigid outer shell. Artstotle"s lantern: strong jaw that helps them to feed on algae and kelp.
