Download Henry Guan, Akash Kashyap, and Angus Qian

Henry Guan, Akash Kashyap,
and Angus Qian Akash Kashyap
http://peterbe.mobi/plog/interior-octopus/octopus.jpg
Overview
 85, 000 species
 Marine, Terrestrial, Freshwater habitats
 Very Diverse
 Classes: Chitons, Gastropods, Bivalves, Cephalopods
 Shelled cephlapods called ammonites
http://biology.unm.edu/ccouncil/Biology_203/Images/Protostomes/squid.jpg
http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/Bio%20102/Bio%20102%20lectures/Animal%20Diversity/Protostomes/Lophotrochozoans/chiton_dorsal_surface.jpg
http://www.manandmollusc.net/advanced_introduction/Images/Helix-pomatia1.jpg
http://www.xconomy.com/wordpress/wp-content/images/2008/12/scallop_eyes.jpg
http://www.environment.gov.au/biodiversity/abrs/publications/other/species-numbers/2009/04-02-groups-invertebrates.html#mollusca
http://www.nhm.ac.uk/nature-online/virtual-wonders/ammonite/img0001.jpg
Akash Kashyap
Body Cavity and Symmetry
 Mollusks have a coelom
 Cephalopod (Octopus, Squid)  Bilateral Symmetry
Exception
 Visceral mass contains organs
http://bio1151b.nicerweb.net/Locked/media/ch33/33_15MolluscBodyPlan-L.jpg
http://www.museumeducation.bedford.gov.uk/Bedfordbytes/nature/images_nature/gallery_natural_objects/images/Scallop%20Shell_jpg.jpg
http://infusion.allconet.org/webquest/PhylumMollusca.html
http://fractalontology.files.wordpress.com/2008/03/nautilus.jpg
Akash Kashyap
Nervous System
 2 main nerve cords, 3 in bivalves
 Visceral – internal organs, Pedal – foot
 Ganglia – “control rooms” throughout body
 Cerebral ganglia = eyes’ interaction with brain, pedal
ganglia = foot, commissures
 Brain, Cephalopod most developed
http://infusion.allconet.org/webquest/PhylumMollusca.html
http://faculty.vassar.edu/mehaffey/academic/animalstructure/outlines/mollusca.html
http://www.oceanicresearch.org/education/wonders/mollusk.html
Akash Kashyap
Circulatory System
 Open circulatory system
 Small coeloms surround heart and gonads
 Hemocyanin as oxygen carrier
 Atria of heart functions as part of excretory system
http://www.esu.edu/~milewski/intro_biol_two/lab__11_mollusca/images/bivalve_circulatory.jpg
http://www.biology.ualberta.ca/courses.hp/zool250/Labs/Lab07/Loligo-circ-syst.GIF
http://en.wikipedia.org/wiki/Mollusca
Angus Qian
Digestive System
 Most Mollusks have a radula
 Cephalopods have a beak
 Mouths contain glands that produce mucus
 Cilia in the digestive system sort out particles in the mucus
 Large food particles are sent to the cecum
http://static.howstuffworks.com/gif/octopus-mantle.jpg
http://www.bio.miami.edu/dana/pix/ham.jpg
http://www.seaslugforum.net/images/gut2.jpg
http://en.wikipedia.org/wiki/Mollusca
Angus Qian
Excretory System
 Atria of heart filters waste in blood
 Waste sent to kidneys as urine
 Nephridia collect salvageable materials (return to body) and remaining
materials released in urine
 Waste sent to mantle for expulsion
http://en.wikipedia.org/wiki/Mollusca
http://webs.lander.edu/rsfox/rsfoximages2/bivalve142a_x550_x_413x.gif
Artia doesn’t “filter “
No Kidney like you see in us . .
Use Nephridia (kidney
precursor)
Angus Qian
Locomotive/Musculature
 All molluscs have a muscular foot
 In chitins, foot acts as a suction cup
 In bivalves foot is modified into a burrowing organ
 In cephalopods foot in used in jet propulsion
 Gastropods use the mucus produced in the mouth the mouth to slide
along
http://www.freewebs.com/adoptamollusk/organsystems.htm
http://cas.bellarmine.edu/tietjen/Laboratories/Bio%20Pix%204%20U/Image95.gif
http://en.wikipedia.org/wiki/Mollusca
http://www.palaeos.com/Invertebrates/Molluscs/Images/mollusc_classes.jpg
Angus Qian
Sensory Structures / Features
•Eyes
•Big and developed to small and
basic
•Tentacles (Gastropods, Cephalopods)
•Touch, Smell
•Statocysts
•Balance
•Osphridia
•Mainly used to test incoming water
•Helps gills
http://seawifs.gsfc.nasa.gov/OCEAN_PLANET/IMAGES/squid_radula.gif
http://www.pirx.com/gallery/albums/mollusks/radula.jpg
Henry Guan
Skeletal Type
 Mainly Exo-Skeletons
 Mantle excretes shell
 Chitin, Conchiolin, Hardened with Calcium Carbonate
 Squid’s have a style, support
 Slugs, Squid, Octopuses lost shell during evolution
http://www.worldzootoday.com/wpcontent/uploads/2009/03/aleqm5jnf
mrfbli15mifyiejseclvsvdgg.jpeg
Henry Guan
Reproduction
 Mollusks can be hermaphrodites, or dioecious
 Gonads in visceral mass
 Larval stage called trochophore
 Usually external fertilization (No Copulation)
 Can also go through mating rituals

This involves copulation
http://farm3.static.flickr.com/2418/2265118301_dbcd6bdfd8_o.jpg
http://imgs.sfgate.com/c/pictures/2008/04/17/ba_octo1.jpg
Henry Guan
Gas Exchange
•Gills
•Filmaents (cilia) help gills
•Osphridia also help
•No gills, gasses diffuse through mantle wall
http://i14.tinypic.com/2emev07.gif
Henry Guan
Unique Features
 Largest Eyes in all of Animalia Kingdom
 Colossal Squid!
 Up to 46 Feet
 Largest known Invertebrate
http://photos.mongabay.com/07/0223cs2.jpg
http://www.benjaminmccormick.com/imgphotos/smallSquid_Eye_m.jpg
Henry Guan
Quiz Questions
What other system (no
Circulatory) do the
atria of the heart come
into play with?
Excretory
What are the two
main
components of
the mollusks’
exoskeleton?
Calcium Carbonate
Chitin
What category in
the mollusks do
not have
coelom?
Cephalopods
Fertilization for
mollusks usually
happens where?
External Fertilization
Usually in the ocean/water