BIO SCI 94 Lecture Notes - Lecture 11: Filter Feeder, Annelid, Mollusca

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

Herbivorous feeders: eat plants and algae (vegans) Mass feeders - eat chunks of food and need substantial mouth parts to acquire those chunks. Deposit feeders - animals that eat its way through a food-containing substrate. Filter feeders - organisms that obtain food by filtering small particles or small organisms out of water or air. Initiate gastrulation from a pore that becomes their mouth. In the protostomes, coelom forms later in development, from cavities that arise within blocks of mesoderm, rather than being formed by cells that get pinched off the gut. Water-to-land transitions were important in evolution of the protostomes, because this opened up entirely new habitats and new resources to exploit. To make transition to land, new adaptations must allow protostomes to. Desiccation-resistant eggs evolved repeatedly in populations that made the transition to life on land. Insect eggs have thick membrane that keep in moisture. Snail and slug eggs have thick shell that retains water.