WFSC 302 Study Guide - Midterm Guide: Weberian Apparatus, Tiktaalik, Cranial Kinesis

• School: Texas A&M University
• Department: Wildlife & Fisheries Sci.
• Course: WFSC 302
• Professor: Conway Kevin

Document Summary

Three types of multicellular animals: metazoa (multicellular animals, porifera (sponges): no germ layers, no true tissues or organs, intracellular digestion. Eumetazoa (all other animals): germ layers present, true tissues and organs, mouth and digestive system present. Further divided into two groups: radiate animals (phylum cnidaria and ctenophora, 2 germ layers (diploblastic, radial symmetry, bilateria (all remaining phyla, bilateral symmetry, 3 germ layers (triploblastic. Three germ layers (triploblastic: ectoderm (outer layer-integument, endoderm (inner layer-gut, mesoderm (middle layer- forming muscle layers and numerous organs) Protostomata: blastopore forms mouth, anus forms from opening that develops later. Deuterostomata vertebrates: blastopore forms anus, mouth forms from opening that develops later. Phylum chordata: urochordata (tunicates/sea squirts) more recent studies indicate they are sister group to vertebrata, cephalochordata (lancelets) traditional view of chordate relationships based on number of anatomical similarities, vertebrata (chordates with craniums, most with vertebrae)