Transcript Mollusks
Adi Beal, Lynsey Brinker,
Deanna Holby, Rylie Williams
Symmetry in mollusks
Bilateral symmetry
How do mollusks move?
Most – muscular foot
Tentacles
Shells
http://gotmuscle.weebly.com/mollusca.html
Nervous system
Present nervous system
Nerve bundles
Ganglia
Squid-large developed eyes similar to human
Digestive System
Siphon system
Waste
Excretory system
Nephridium
Kidney
One-way
Circulatory system
Cephalopods-closed
Gastropods and Bivalves-open
Respiratory System
Siphons
Gills
Support of skeletal system
Outer shell
Soft body
Muscular foot
Tentacle's
Reproductive system
Sexually
Gonad
Three main classes
Gastropod/Univalves
Bivalves
Cephalopods
http://www.isgs.uiuc.edu/outreach/geology- http://www.thecanadianencyclopedia.ca/en/
resources/gastropods
article/mollusc/
http://w3.shorecrest.org/~Lisa_Peck/MarineBi
o/syllabus/ch7invertebrates/Invertwp/inv_class
_of_06_wp/jiali_cuttlefish/classification.htm
Gastropods/Univalves
Largest group of mollusks’
Snails, conchs (univalves), abalones, whelks, sea slugs, and garden slugs
On shell (except slugs)
rhythmic contraction of muscular foot
Use radula to scrape up food
islandcolors.com
www.slugwatch.co.uk
www.caribbeanfmc.com
Bivalves
Clams, oysters, and scallops
Two-part, hinged shell joined by strong muscles
Close shell by contracting muscles
Well adapted to living under water
Clams move with their foot
Scallops open and close shell rapidly
trueoyster.com
tbep.org
Cephalopods
Most specialized and complex group
Squid, octopuses, cuttlefish, and chambered nautiluses
Foot divided into many tentacles
All live in water
Well developed nervous system
Only mollusks with closed circulatory system
www.arkive.org
www.practicalfishkeeping.co.uk
Why are cephalopods mollusks?
Similar internal structures
U shaped digestive track
mantle
Used to have a shell
Now kind of internal
userwww.sfsu.edu
Videos
Cuttlefish Video
http://video.nationalgeographic.com/video/worlds-deadliest-ngs/deadliestcuttlefish-hypnosis
Giant Squid Video
http://www.discovery.com/tv-shows/curiosity/videos/first-video-of-a-giantsquid.htm
Scallop Video
http://www.youtube.com/watch?v=zaYNFQd_7HE
Mollusks are referred to as “soft-bodied”
because…
Composed of shell and fleshy body
The shell protects the soft body
Fleshy part divided into foot & visceral mass
Organs stored soft, fleshy visceral mass
The real meaning
Gastropod: “stomach foot”
Cephalopod: “head foot”
How pearls are created
In oysters, clams, and mussels
Foreign substance in shell and mantle
Mantle creates substance to protect itself
Mantle layers irritant in mantle substance
Eventually results in a shell
Coelom
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Body cavity in Metazonas
Testinal canal and Body wall
Seperation
Transports nutrients
Snail diagram
Ganglia
Clam diagram
Palps
Gills
Posterior
Abducto
r
Muscle
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/Nervou
sSystem.html
http://www.livebinders.com/play/play/307257
http://www.madsci.org/posts/archives/1998-05/892237971.Zo.r.html
http://www.studyblue.com/notes/note/n/mollusks-andannelids/deck/6225786
https://www.google.com/imghp?hl=en&tab=wi&ei=MwuVKakLYy9uASb9YIQ&ved=0CAQQqi4oAg