Gen Bio 116 Lecture 6 - Unikont Diversity 3.pdf - Gen Bio 116 Lecture 6 Unikont Diversity III Thursday February 2 2017 3:47 PM I Basal Animals-> CC

Gen Bio 116 Lecture 6 - Unikont Diversity 3.pdf - Gen Bio...

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Basal Animals I. --> CC basal animals Introduction to Bilateria II. --> CC derived traits of bilateria, protostomes, deuterostomes Lophotrocozoa Clade III. --> CC derived traits, member phyla Ecdysozoa Clade IV. --> CC derived traits, member phyla *Know the shared derived traits that unite members of each group Basal Animals *Fig 32.11 Most ancestral, have general derived traits - Lack more specific derived traits present in most animals - 2 groups: Porifera, Cnidaria Porifera - lack tissues and radial symmetry i. Cnidaria - bilateral symmetry, triploblasty ii. Phylum Porifera A. "to have pores" - sponges Shared derived traits Least complex animals 1) Multicellular 2) No symmetry, tissues, organs 3) i. Sponge Morphology ii. simple sponges- some are more complex Porous, sac-like body - Osculum : Open end - Spongocoel : Central cavity - Water passes through, food particles filtered out - NOT a digestive cavity - digestion is intracellular **fig 33.4 - Choanocytes Collar cells, feeding cells of sponges - Very similar to choanoflagellates - Flagellated -

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