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Chapter 10- Phylum Mollusca Includes: snails, slugs, octopus, etc. -…
Chapter 10- Phylum Mollusca Includes: snails, slugs, octopus, etc.
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Reproduction
dioecious, some snails & bivavles arre monoecious
most sexually, some asexually by parthenogenesis
Body Structures
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Head-Foot: photoreceptors range from simple light sensors to image forming eyes. Muscular foot or tentacles
Body Plan
Mantle: formed by 2 folds of skin. secretes a shell over visceral mass. has a mantle cavity-between mantle and body wall, where gill or lungs reside
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5 Major Classes
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Class Bivalvia-mussels, oysters, etc
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umbo-oldest part of the shell. siphons- incurrent & excurrent. crystalline style- gel rod that releases enzyme/churns food. spat-settled larvae. glochidium-freshwater larvae that parasitize fish gills
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Class Gastropoda-snails,slugs,etc
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stomach foot. torsion-twisting of body during ontogenetic development, so one larva grows faster than other. operculum- like a shell trapdoor. coiling- when viscera formed separately from torsion.
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