Mollusks Adi Beal, Lynsey Brinker,

Deanna Holby, Rylie Williams

Symmetry in mollusks Bilateral symmetry

How do mollusks move?Most – muscular footTentacles Shells

http://gotmuscle.weebly.com/mollusca.html

Nervous systemPresent nervous systemNerve bundlesGangliaSquid-large developed eyes similar to human

Digestive SystemSiphon system Waste

Excretory systemNephridium KidneyOne-way

Circulatory systemCephalopods-closed Gastropods and Bivalves-open

Respiratory SystemSiphonsGills

Support of skeletal systemOuter shellSoft bodyMuscular foot Tentacle's

Reproductive systemSexuallyGonad

Three main classesGastropod/UnivalvesBivalvesCephalopods

http://www.isgs.uiuc.edu/outreach/geology-resources/gastropods

http://www.thecanadianencyclopedia.ca/en/article/mollusc/

http://w3.shorecrest.org/~Lisa_Peck/MarineBio/syllabus/ch7invertebrates/Invertwp/inv_class_of_06_wp/jiali_cuttlefish/classification.htm

Gastropods/UnivalvesLargest group of mollusks’Snails, conchs (univalves), abalones, whelks, sea slugs, and

garden slugs On shell (except slugs) rhythmic contraction of muscular footUse radula to scrape up food

islandcolors.com www.slugwatch.co.uk www.caribbeanfmc.com

BivalvesClams, oysters, and scallopsTwo-part, hinged shell joined by strong musclesClose shell by contracting musclesWell adapted to living under waterClams move with their footScallops open and close shell rapidly

trueoyster.com tbep.org

CephalopodsMost specialized and complex groupSquid, octopuses, cuttlefish, and chambered nautilusesFoot divided into many tentacles All live in waterWell developed nervous systemOnly mollusks with closed circulatory system

www.practicalfishkeeping.co.uk

www.arkive.org

Why are cephalopods mollusks?Similar internal structures

U shaped digestive trackmantle

Used to have a shellNow kind of internal

userwww.sfsu.edu

VideosCuttlefish Video

http://video.nationalgeographic.com/video/worlds-deadliest-ngs/deadliest-cuttlefish-hypnosis

Giant Squid Videohttp://

www.discovery.com/tv-shows/curiosity/videos/first-video-of-a-giant-squid.htm

Scallop Videohttp://www.youtube.com/watch?v=zaYNFQd_7HE

Other Phylum Facts

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

The real meaningGastropod: “stomach foot”Cephalopod: “head foot”

How pearls are createdIn oysters, clams, and musselsForeign substance in shell and mantleMantle creates substance to protect itselfMantle layers irritant in mantle substanceEventually results in a shell

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

Snail diagram

Ganglia

Clam diagram

PosteriorAbductorMuscle

GillsPalps

Mouth

Anterior Abductor Muscle

Foot Mantle-produces shell

Works Cited"Coelom." - Definition from Biology-Online.org. N.p., n.d. Web. 02 Oct. 2014.

<http://www.biology-online.org/dictionary/coelom>.

"Marine Education Society of Australasia." Marine Education Society of Australasia. N.p., n.d. Web. 02 Oct. 2014. <http://mesa.edu.au/>.

"Mollusks." - Acadia's Oceanside Meadows Inn. N.p., n.d. Web. 02 Oct. 2014. <http://www.oceaninn.com/wildlife/mollusks.htm>.

N.p., n.d. Web. <http%3A%2F%2Fmolluskscience.weebly.com>.

N.p., n.d. Web. <http%3A%2F%2Fwww.earthlifenetinverts%2Fmollusca.html>.

N.p., n.d. Web. <http%3A%2F%2Fwww.tulane.edu%2Fbfleury%2Fdiversity%2Flabguide%2Fmlannel.html>.

Photo Work Cited http://

shells.tricity.wsu.edu/ArcherdShellCollection/Illustrations/NervousSystem.html

http://www.livebinders.com/play/play/307257http://

www.madsci.org/posts/archives/1998-05/892237971.Zo.r.htmlhttp://

www.studyblue.com/notes/note/n/mollusks-and-annelids/deck/6225786

https://www.google.com/imghp?hl=en&tab=wi&ei=M-wuVKakLYy9uASb9YIQ&ved=0CAQQqi4oAg