BIOL 1209 Chapter : 20140425 123428
Document Summary
Chapter 33- invertebrates: most recent hypothesis about animal phylogeny, no true tissue (membranous coating which contains cells that perform similar funtions) - 1st --- porifera , diploblastic: two tissue layers --- eumetazoa, triploblastic: 3 tissue layers --- bilateria. Scyphozoa - true jelly fish; mainly in medusa stage. Cubozoa very toxic and kills many humans. Anthozoa nemo is found in here; forms the largest sea marines. Concept 33. 3- lophotrochazoans, a clad identified by molecular data, have the widest range of animal body forms. Coelomate body cavity; entire tissue covered by mesoderm tissue layer. Pseudocoelomate body cavity is covered by pseudocoelom. Insects and their relatives: more species rish than all other animals. Insects are characterized by having 3 pairs of walking legs on thorax: 1-2 pairs of wings, 3 body regions. Ophiuroidea long brittle arms gives them their names ( brittle stars ) Echinoidea spines that radiate out of their body; pentasymmetry (multiples of 5)
