Adi Beal, Lynsey Brinker, Deanna Holby, Rylie Williams

Symmetry in mollusks Bilateral symmetry

How do mollusks move? Most – muscular foot Tentacles Shells

Nervous system Present nervous system Nerve bundles Ganglia Squid-large developed eyes similar to human

Digestive System Siphon system Waste

Excretory system Nephridium Kidney One-way

Circulatory system Cephalopods-closed Gastropods and Bivalves-open

Respiratory System Siphons Gills

Support of skeletal system Outer shell Soft body Muscular foot Tentacle's

Reproductive system Sexually Gonad

Three main classes Gastropod/Univalves Bivalves Cephalopods resources/gastropods article/mollusc/ /~ Lisa_Peck/MarineBi o/syllabus/ch7invertebrates/Invertwp/inv_class _of_06_wp/jiali_cuttlefish/classification.htm

Gastropods/Univalves Largest group of mollusks’ Snails, conchs (univalves), abalones, whelks, sea slugs, and garden slugs On shell (except slugs) rhythmic contraction of muscular foot Use radula to scrape up food islandcolors.comwww.slugwatch.co.uk

Bivalves Clams, oysters, and scallops Two-part, hinged shell joined by strong muscles Close shell by contracting muscles Well adapted to living under water Clams move with their foot Scallops open and close shell rapidly trueoyster.com tbep.org

Cephalopods Most specialized and complex group Squid, octopuses, cuttlefish, and chambered nautiluses Foot divided into many tentacles All live in water Well developed nervous system Only mollusks with closed circulatory system

Why are cephalopods mollusks? Similar internal structures U shaped digestive track mantle Used to have a shell Now kind of internal userwww.sfsu.edu

Videos Cuttlefish Video cuttlefish-hypnosis cuttlefish-hypnosis Giant Squid Video squid.htm squid.htm Scallop Video

Mollusks are referred to as “soft-bodied” because… Composed of shell and fleshy body The shell protects the soft body Fleshy part divided into foot & visceral mass Organs stored soft, fleshy visceral mass

The real meaning Gastropod: “stomach foot” Cephalopod: “head foot”

How pearls are created In oysters, clams, and mussels Foreign substance in shell and mantle Mantle creates substance to protect itself Mantle layers irritant in mantle substance Eventually results in a shell

Coelom Body cavity in Metazonas Testinal canal and Body wall Seperation Transports nutrients

Snail diagram Ganglia

Clam diagram Posterior Abducto r Muscle GillsPalps Mouth Anterior Abductor Muscle Foot Mantle-produces shell

Works Cited "Coelom." - Definition from Biology-Online.org. N.p., n.d. Web. 02 Oct "Marine Education Society of Australasia." Marine Education Society of Australasia. N.p., n.d. Web. 02 Oct "Mollusks." - Acadia's Oceanside Meadows Inn. N.p., n.d. Web. 02 Oct N.p., n.d. Web..

Photo Work Cited sSystem.html sSystem.html annelids/deck/ annelids/deck/ wuVKakLYy9uASb9YIQ&ved=0CAQQqi4oAg