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Mollusca

Mollusca. Sheridan Olivia Kel. http://www.infovisual.info/02/photo/Avisual-Mollusca.html. Body Structure & functions. Muscular foot - used for movement Visceral mass - contain most of the internal organs Mantle - a fold of tissue that drapes over the visceral mass and secretes a shell

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Mollusca

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  1. Mollusca Sheridan Olivia Kel http://www.infovisual.info/02/photo/Avisual-Mollusca.html

  2. Body Structure & functions • Muscular foot - used for movement • Visceral mass - contain most of the internal organs • Mantle - a fold of tissue that drapes over the visceral mass and secretes a shell • Mantle cavity - houses the gills, anus and excretory pores • Radula - scrape food http://waterquality.ec.gc.ca/WaterQualityWeb/media /cabin/bugs/Mollusca.jpg Kel Chan

  3. Major classes of Phylum Mollusca • Polyplacophore (e.g. Chitons) - shell with eight plates, foot used for locomotion, radula, no head • Gastropoda (e.g. snails, slugs) - asymmetrical body, coiled shell (if one is present), foot for locomotion, radula • Bivalvia (e.g. clams, mussels, scallops, oysters) - flattened shell with two valves, no head, paired gills, no radula, suspension feeders, mantle forms siphons • Cephalopoda (e.g. squids, octopuses, cuttlefish, chambered nautiluses) - head surrounded by grasping tentacles, have suckers, shell external, internal or absent, mouth w/ or w/o radula, locomotion by jet propulsion by siphon Kel Chan

  4. http://wps.aw.com/wps/media/objects/1668/1708348/ebook/fig/big/3714633055.jpghttp://wps.aw.com/wps/media/objects/1668/1708348/ebook/fig/big/3714633055.jpg Kel Chan

  5. Bivalves http://www.geocities.com/ymike2002/images/BIVALVE.jpg Olivia Petrocco

  6. Cephalopods http://i.ehow.com/images/GlobalPhoto/Articles/2181866/squid-main_Full.jpg http://img3.travelblog.org/Photos/1/195834/f/1458234-Coconut-Octopus-0.jpg http://hoopermuseum.earthsci.carleton.ca/saleem/Images/Ammonites.jpg Olivia Petrocco http://www.manandmollusc.net/advanced_introduction/MainPage/Nautilus.gif

  7. Chitons Structure: -oval-shaped body, not segmented -shell with 8 dorsal plates, segmented Food: -uses it’s radula to cut and ingest algae Marine; usually found clinging to rocks. Its foot acts as a suction cup to grip the rock and creep along it. (http://www.bethel.edu/~johgre/bio114d/images/higher%20inverts/nChiton.jpg) Sheridan Edwards

  8. Gastropods Structure: -torsion: in embryonic development, the visceral mass rotates 180 degrees -differs from shell formation -asymmetrical body usually with a coiled shell Food: -use radula to graze on algae or plants -predators with radula modified to boring holes in shells or tearing apart prey Terrestrial snails lack gills and use the lining of the mantle cavity as lungs. Sheridan Edwards (http://images.encarta.msn.com/xrefmedia/aencmed/targets/illus/ilt/T629043A.gif)

  9. Pop Quiz • What is the only form of cephalopod with an external shell? • What is the most common form of a mollusc? • What part of a mollusc houses the gill, anus and excretory pores? • What do you call the straplike organ that scrapes food?

  10. ANSWERS!!!!!!! • Chambered Nautilus • Gastropod • Mantle cavity • Radula

  11. Cuttlefish Out! http://www.tnaqua.org/Newsroom/HighRes/ComCuttlefish9.jpg

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