BIO SCI 94 Chapter Notes - Chapter 34: Annelid, Hemimetabolism, Rigid Body

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Catherine Loudon

Document Summary

30 animal phyla known to exist, 22 are protostomes. Proto:major source of food for humans, so they"re economically imp. Farmers rely on proto like earthworms to prepare soil, and on bees to pollinate crops. Some insects = negaive impact on food producion by damaging crops, other insects protect crops from pests. Proto play an imp role in causing/transmiing human diseases, and are common parasites. Proto include 2 of most imp model org in bio sci: fruit ly drosophila melanogaster and roundworm. Two major groups of bilaterally symmetric, triploblasic animals: protosomes and deuterosomes. Recent data shows two major subgroups of proto: lophotrochozoa include mollusks & annelid worms. Diversiicaion in proto =caused by transiion from aquaic to terrestrial habitats, and modular design of many protostome body plans. Only one lineage in deutero moved onto land. Proto made water to land trans many imes. Water to land tran = imp b/c they open up new habitats & resources.