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 OPEN

CIRCULATIONcoelom contains circulatory fluid (blood) = HEMOCOEL

Blood = HEMOLYMPH

Image: http://fig.cox.miami.edu/Faculty/Dana/ham.gif

CLAMS

Strain food from water =

FILTER FEEDERS

Clams stay in one place = SESSILE

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

http://www.4discountcookware.biz/market/15189

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 LARVAFound in all

AQUATIC mollusks EXCEPT CEPHALOPODS

http://www.mbari.org/seminars/2003/summer2003/august4_rouse.html

http://www.okc.cc.ok.us/biologylabs/Documents/Evolution/Trochophore_larva.htm

TORSION in Gastropods

Twisting of body 180° during development

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

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

CLASSES of MOLLUSKS

BIVALVES

Clams, oysters, scallops

http://seattle.citysearch.com/feature/10243

http://www.meddybemps.com/shells/2draw_scallop.html

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

Snails, slugs, conchs, nudibranchshttp://www.seaotter.com/marine/research/tritonia/diomedea/pics/pink_nudibranch.jpg

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

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

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)

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

CLASSES of MOLLUSKS

CEPHALOPODS

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

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 theINVERTEBRATES

• Many have INK for defense