BIO 200 Lecture Notes - Lecture 19: Armadillidiidae, Cuticle, Cephalopod
12 Nov 2017
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Bio 200 jessica poulin lecture 19: mollusks. Different: flame scallop, blue ringed octopus, banana slug (2nd longest slug, 1-foot can be different colors when mating) 4 groups of mollusks: polyplacophora chitons (1,000 species) Live in shallow water: gastropoda snails, slugs (85,000 species) Tentacles common (eyes and chemo or mechano-sensing) Transfer poison to outer surface to protect themselves = hence, bright colors = poisonous! There are variable levels of cephalization in mollusks. Radula mouthpart (microscopic teeth) mollusks use to scrape algae -> gastropods use to drill in shells to slurp victims out. Cross-fertilization -> is common in mollusks change sex, sex switchers: bivalvia bilvalves (30,000 species) Free swimming larvae: cephalopoda: octopodes, squids, and nautili (800 species) Marne predators -> arms, tentacles -> color changing -> jet propulsion -> Cephalopods: complex eyes -> increased nerve system -> incredibly smart. escape from tanks to other tanks and eat inhabitants and go back to other tanks: ecdysozoans grow by molting (horse shoe crabs)
