MORE MOLLUSKS

VOCAB

RADULA

TONGUE covered with teeth unique to mollusks Used to drill OR scrape food off surfaces NO RADULA IN BIVALVES

Image from: http://www.wildsingapore.com/chekjawa/text/i900.htm#r

CHROMATOPHORES

Pigments in the skin that help organisms blend in with their surroundings Image from: http://www.biosbcc.net/ocean/marinesci/03ecology/mlimg/mlpop.jpg

COELOM = body cavity

In organisms with = HEMOCOEL OPEN CIRCULATION coelom contains circulatory fluid (blood) Blood = HEMOLYMPH Image: http://fig.cox.miami.edu/Faculty/Dana/ham.gif

CLAMS

http://www.cinderzelda.com/czpics/potato2.jpg

Clams stay in one place = SESSILE http://www.4discountcookware.biz/market/15189 Strain food from water = FILTER FEEDERS

MARINE/FRESH WATER

MARINE – live in salt water FRESH WATER live in ponds, lakes, streams, rivers, etc.

Image: http://www.belizeanjourneys.com/grc/mangrove/man2.jpg

TROCHOPHORE LARVA

Found in all AQUATIC mollusks EXCEPT CEPHALOPODS http://www.mbari.org/seminars/2003/summer2003/august4_rouse.html

http://shells.tricity.wsu.edu/ArcherdShellCollection/Illustrations/TorsionStages.html

TORSION in Gastropods

Twisting of body 180 ° during development

CLASSES of MOLLUSKS

Clam from: http://www.geocities.com/TheTropics/2428/directory.html

BIVALVES

http://seattle.citysearch.com/feature/10243 http://www.meddybemps.com/shells/2draw_scallop.html

Clams, oysters, scallops

BIVALVES

• 2 SHELLS • FILTER FEEDERS • Only mollusks WITHOUT A

RADULA

• Only mollusks WITHOUT

CEPHALIZATION

• OPEN CIRCULATION • INDIRECT DEVELOPMENT with a

TROCHOPHORE LARVA

• SESSILE as ADULTS

CLASSES of MOLLUSKS

http://ippc2.orst.edu/potato/grayslugs.jpg

http://mysticearth.us/images/conch.JPG

http://www.seaotter.com/marine/research/tritonia/diomedea/pics/pink_nudibranch.jpg

Snails, slugs, conchs, nudibranchs

GASTROPODS

• MOST HAVE 1 SHELL • MOST SLOW CRAWLING – VEGGIE GRAZERS with RADULA • CEPHALIZATION • OPEN CIRCULATION • Aquatic ones have INDIRECT

DEVELOPMENT with a TROCHOPHORE LARVA

• TORSION (twisting of body)

CLASSES of MOLLUSKS

CEPHALOPODS http://www.geocities.com/TheTropics/2428/directory.html

http:// www.seasite.niu.edu/indonesian/Themes/Animals/sea/images/cuttlefish.jpg

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CEPHALOPODS

MOST HAVE NO SHELL FAST SWIMMING CARNIVORES (RADULA) CEPHALIZATION Only mollusks with CLOSED CIRCULATION

• • •

Only group with DIRECT DEVELOPMENT CHROMATOPHORES for camouflage MOST INTELLIGENT of the INVERTEBRATES

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Many have INK for defense