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Lecture 13

Lecture 13 - Mollusca.docx

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Department
Biology (Sci)
Course
BIOL 111
Professor
Suzanne Gray
Semester
Fall

Description
October 18 , 2011 Mollusca Phylum Mollusca:  Mollusks, shellfish nd 100,000 species  2 largest animal phylum  Terrestrial or aquatic  Bilaterally symmetrical, triploblastic  Coelomate protostomes  Trochophore larvae (marine mollusks)  Major groups: oClass Polyplacophora oClass Gastropoda oClass Bivalvia oClass Cephalopoda  Hi▯▯l▯▯▯▯▯▯▯▯ ▯ ▯▯▯▯ oMorphology oModes of nutrition oReproduction ▯▯▯▯oResponse to environment Mollusk Body Plan: ▯▯▯▯▯▯ ▯▯▯▯▯▯ ▯▯▯ ▯▯▯▯▯ ▯▯"#▯▯$▯ ▯▯▯▯ "▯▯▯▯▯$ ▯▯ ▯▯▯▯▯▯ ▯▯▯▯▯ /▯ ▯▯▯▯▯ !▯▯▯▯▯ ▯▯▯ ▯▯▯▯▯ ▯▯ ▯ ▯▯ ▯▯ ▯▯▯▯ ▯ ▯▯▯ ▯▯▯▯▯▯ // + $▯▯▯▯▯▯▯▯7▯▯▯▯▯▯$▯▯▯ 8 + ▯▯▯▯$▯ October 18 , 2011 Mollusca + ▯▯▯▯ Class Polyplacophora:▯ ▯▯▯ ▯$▯▯=▯▯/▯▯  Many plates  Segmented shell (8 overlapping plates)  Multiple gills  Large muscular foot  Ability to roll in&▯▯▯▯▯▯l▯▯▯  Gills located in man▯( ▯▯▯▯oves  Omnivorous o Radula sc+▯ ▯▯▯▯▯▯ae+ ▯▯▯▯▯▯▯▯▯▯ bryozoans+ $▯ ▯▯ ▯▯▯▯▯ /▯ + ▯$▯▯▯▯$▯ + ▯$▯▯▯▯▯▯▯ Class Bivalvia:  “Two valves”  Reduction of head  Hinged shell  Enlargement of foot  Mantle cavity modified by siphons  Enlargement of gill  Relatively sessile  Filter feeders /,  Broadcast spawners  Example: scallop o Large adductor muscles to close shell o Mantle lined eyes – can detect motion and light Siphons: extensions of posterior mantle  Water flows in mantle cavity and then across gills that act as filters for food  Foot used as anchor and for digging Class Gastropoda:  “Stomach foot”  Most diverse class (70,000 species)  Terrestrial or aquatic  Shelled (snails) or shell-less (slugs, nudibranchs)  Herbivores, predators, scavengers  More complex head and eye  Internal or external fertilization  Either dioecious or hermaphroditic but can produce only sperm or eggs at one time ▯▯▯▯▯▯▯▯▯▯ Torsion: (twisting) of body  180 degree rotation of visceral mass  Mantle Cavity  Anus moved over head Coiling of visceral mass + ▯▯▯7▯▯$8▯▯▯▯ :23▯▯▯▯▯▯ ▯▯▯▯ ▯ th October 18 , 2011 Mollusca *▯▯▯▯▯▯▯▯ ▯ ▯▯▯▯▯▯ +▯▯▯▯▯
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