more mollusks
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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 CIRCULATION
coelom 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 WATERMARINE – 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 the
INVERTEBRATES• Many have INK for defense