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3454lablecture6 - Sessile shell made totally of calcium...

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PHYLUM ARTHROPODA SUBPHYLUM CRUSTACEA Mostly aquatic, some terrestrial Economically important – part of zooplankton food web, barnacles, food 3 body regions – head, thorax, and abdomen Stalked compound eyes Biramous limbs – outer part=exopodite, inner part=endopodite, used to walk, swim, feed, fight, respire, clean gills, etc. Book gills Two antennae Chitinous exoskeleton with calcium carbonate is very tough Variable degrees of tagmatization and variable mouthparts Mandibles, maxillae, and maxillipeds CLASS BRANCHIOPODA Filter feeders, planktonic ORDER ANOSTRACA Fairy shrimp, no abdominal limbs Carapace like a shell Nauplius larval stage ORDER CLADOCERA ( DAPHNIA) Bivalve, 2 nd pair of antennae used for swimming
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CLASS MAXILLOPODA ORDER COPEPODA (COPEPODS) Dorsally flattened as opposed to laterally flattened Use 1 st pair of antennae to swim Nauplius eye – single, noncompound eye ORDER OSTRACODA (OSTRACODS) Bivalve, benthic animals Use 1 st pair of antennae to swim ORDER CIRRIPEDIA (BARNACLES)
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Unformatted text preview: Sessile, shell made totally of calcium carbonate Planktonic larvae Filter feeders Largest penis/body size ratio in animal kingdom CLASS MALACOSTRACA Advanced crustaceans Ancestrally, have 19 body segments with a pair of limbs on each segment ORDER ISOPODA Isopods (rolly pollies), terrestrial crustaceans ORDER AMPHIPODA Some terrestrial, most aquatic Have ancestral 19 segments with 19 pairs of limbs No larval stage, brood eggs ORDER DECAPODA (LOBSTERS, SHRIMP, CRAYFISH, CRABS) Many larval stages Chelipeds (pincers) – even in shrimp – Boxing shrimp that kills with chelipeds Variable levels of tagmatization OMISSIONS Ex. 2 – no nauplius larvae, instead observe live isopod Ex. 13 – just draw limbs in lab book, don’t tape to page. Draw on the page and tape the mouthparts to a paper towel On table, big barnacle=stalk barnacle, small barnacle=goose barnacle, acorn barnacles on display table...
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