phylum mollusca

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powerpoint presentation phylum mollusca fig. 16.co phylum mollusca protostomes lophotrochozoan group eucoelomates (coelomates) tridacna squamosa tridacna gigas phylum mollusca soft bodied shelled some without cephalization sensory organs mouths body divisions visceral mass head-foot mantle tonicella lineata fig. 16.1a phylum mollusca complete digestive tract digestive glands specialized feeding structures circulatory system heart (2 chambers) open system in most groups closed in cephalopods coelom restricted to pericardium in most cases octopus briareus phylum mollusca advanced nervous system brain sensory organs eyes (simple and camera) sensory papillae excretory system kidney-like nephridia reproduction monoecious and dioecious external development external & internal fertilization mollusc phylogeny ~50-80k extant species ~40k extinct species fossil records from precambrian period of proterozoic eon (>570my bp) fig. 16.41 mollusc phylogeny mantle secreting shell muscular foot chambered heart fig. 16.42 mollusc taxonomy major classes polyplacophora chitons chiton tuberculatus lives in the rocky intertidal zones eat algae with its radula 8 shell …

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es polyplacophora gastropoda bivalvia cephalopoda octopus, squid, nautilus giant cuttlefish (sepia latimanus) nautilus sp octopus sp mollusc taxonomy major classes polyplacophora gastropoda bivalvia cephalopoda minor classes monoplacophora solenogastres caudofoveata generalized mollusc anatomy fig. 16.2 gastropod feeding apparatus fig. 16.3 respiration: gills fig. 16.4 shell structure & formation fig. 16.5a a pearl among the swine fig. 16.5b mollusc reproduction & development indirect development larval stages trochophore larva free swimming, ciliated, shell formation begins veliger larva free swimming, ciliated velium forms, shell/body torsion occurs spat metamorphic form between veliger and juvenile shell elaborates trochophore larva fig. 16.6 gastropod veliger larva velia mouth shell fig. 16.7 zygote trochophore veliger spat juvenile adult adult abalone fig. 16.15a class polyplacophora - chitons fig. 16.10 polyplacophoran anatomy fig. 16.9 class gastropoda the shell game fig. 16.12 class gastropoda - torsion fig. 16.13 gastropod shell coiling fig. 16.14 gastropod gill/mantle cavity evolution fig. 16.17 generalized gastropod anatomy …

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(region of mantle cavity) release of glochidia veliger larvae glochidia attach to gills of fish and are distributed fig. 16.35a phylum mollusca, class cephalopoda closed circulatory system shell: lost in octopus, extremely reduced and enclosed in mantle in squid, planar spiral in nautilus cephalization eye beak around mouth tentacles/arms fig. 16.37 cephalopod anatomy fig. 16.38a squid are the largest cephalopods nautilus anatomy fig. 16.36b cephalopod eye fig. 16.39 mating fig. 16.40 direct development in cephalopods color & morphology changes for camouflage

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powerpoint presentation phylum mollusca fig. 16.co phylum mollusca protostomes lophotrochozoan group eucoelomates (coelomates) tridacna squamosa tridacna gigas phylum mollusca soft bodied shelled some without cephalization sensory organs mouths body divisions visceral mass head-foot mantle tonicella lineata fig. 16.1a phylum mollusca complete digestive tract digestive glands specialized feeding structures circulatory system heart (2 chambers) open system in most groups closed in cephalopods coelom restricted to pericardium in most cases octopus briareus phylum mollusca advanced nervous system brain sensory organs eyes (simple and camera) sensory papillae excretory system kidney-like nephridia reproduction monoecious and dioecious external development external & internal fertilization mollu...

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