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Mollusca Sheridan Olivia Kel Sheridan Olivia Kel

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Presentation on theme: "Mollusca Sheridan Olivia Kel Sheridan Olivia Kel"— Presentation transcript:

1 Mollusca Sheridan Olivia Kel 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 / 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 / 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.jpg Kel Chan

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

6 Cephalopods Olivia Petrocco http://www.manandmollusc.net/advanced_introduction/MainPage/Nautilus.gif 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

7 Food: -uses its radula to cut and ingest algae Structure: -oval-shaped body, not segmented -shell with 8 dorsal plates, segmented 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 Chitons

8 Gastropods Structure: -torsion: in embryonic development, the visceral mass rotates 180 degrees -differs from shell formation -asymmetrical body usually with a coiled shell (http://images.encarta.msn.com/xrefmedia/aencmed/targets/illus/ilt/T629043A.gif) 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

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? / 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 / Chambered Nautilus / Gastropod / Mantle cavity / Radula

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


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