01:119:116 Lecture Notes - Lecture 6: Gastrovascular Cavity, Filter Feeder, Radula

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:116
• Professor: Gregory Transue

Document Summary

2/3/17 true coelom: ancestral state pseudocoelom: derived character: basal animals. Lack more specific derived traits present in most animals. No symmetry, tissues, or organs: sponge morphology. Not a digestive cavity-digestion is intracellular: choanocytes. Diverse, paraphyletic group, ancestral developmental traits: deuterostomes. Attaches self to inner walls of intestines and absorb food digested. Very small: 50 um-2mm; smaller than many protists. Crown of cilia at anterior end: phylum mollusca. Mantle: thin sheet of tissue covering visceral mass. Visceral mass: main body mass, contains viscera (internal organs) Body wall, coelom, many organs divided into segments. Abdomen, thorax (legs and wings), head, compound eye, antennae. Ex: spiders, scorpions, centipedes, millipedes, crabs, lobsters, insects. Costs: limits growth (must molt to grow) limits size. Found throughout animal phylogenetic tree: phylum porifera (sponges) Specialized cells; no true tissues or organs so metazoan. Not a digestive cavity; sponges are filter feeders. Have hollow sac with mouth and tentacles at one end.