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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