MOLLUSKS Phylum Mollusks Ashley Hanooman Mariya Borogodova Siu Lam Koo Amanda Surujdeo Period 3...
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Transcript of MOLLUSKS Phylum Mollusks Ashley Hanooman Mariya Borogodova Siu Lam Koo Amanda Surujdeo Period 3...
MOLLUSKSPhylum Mollusks
Ashley HanoomanMariya BorogodovaSiu Lam KooAmanda SurujdeoPeriod 3
Welcome to Brooklyn Tech’s Zooquarium and Odditorium. We present to you...
What are mollusks?
• Mollusks are...– Invertebrates that include snails, clams,
oysters, octopods, slugs and the giant squid
– Soft bodied animals
– Most of them include a shell
– Mollusca means ‘soft’
Characteristics of Mollusks
• True coelom (fluid filled cavity)• Four body parts
– shell - made of calcium carbonate – mantle - thin tissue wrapping body– muscular foot - contains mouth and other
feeding parts. – visceral mass - contains internal organs
• Bilaterally symmetrical• Most have one or two shells• Mantle -makes the shell
Class Gastropoda: Periwinkle Snails
• Scientific Name: Littorina littorea
• Grows up to 10-12 mm at maturity
• Native to the northeastern Atlantic Ocean (Spain, Ireland)
• Average life expectancy: 5-10 years
• Consume tiny algae growing over rocks
• Overhunted by humans for their meat and shells (jewelry)
Class Gastropoda: Headshield Sea Slugs
• Scientific Name: H. Cephalaspidea
• Head shaped like a shield and fleshy wing-like flaps for locomotion
• Well developed eyes on anterior of head
• Live just beneath surface of the sand
• Sensory cilia around mouth enables them to track prey’s mucous trails
Class Bilvalvia: Bay Scallops• Scientific Name: Argopecten
irradians• Motile: “swims” by opening and
closing shell• They are filter feeders and
others eat plankton• They have eyes; however it only
detects light and motion• Found in all oceans and is a
delicacy to all
Class Polyplacophora: Lined Chiton
• Scientific Name: Tonicella lineata
• Colorful chiton that grows to 5cm at maturity
• Found mainly in Pacific Ocean (Alaska, California, near mainland of Japan) in subtidal waters (30m-90m)
• Contracts into a ball to protect its ventral side
• Consumes coralline algae
Class Cephalopoda: Octopus• Scientific Name:
Octopus vulgaris• Eight arms with many suction
cups• Relative short life expectancy: 6
months – 5 years• 2/3 of its nerve cords are found
in its arms• Highly intelligent creatures that
have both short and long term memory
• Self Defense: ink sacs, camouflage, autotomising limbs
Class Cephalopoda:Giant Squid • Scientific Name:
Architeuthis dux• Largest Invertebrate:
largest recorded being over 18m (59 feet!)
• Found in Northern Atlantic and Bering Sea regions
• Hunted by Sperm whales• Found in ocean depths of
200m-1000m
Interesting Facts
• An Octopus has three hearts and it can squeeze through a hole the size of a 10-cent coin.
• Each octopus has a total ~240 suction cups underside of each arm
• Many land snails can lift 10 times their own weight up a vertical surface.
• Mollusks are the only phylum with its members virtually EVERYWHERE!– Intertidal depths as well as land
Interesting Facts Cont’d…• The eyes of a giant squid are almost the size of
basketballs. • They can weigh as much as 1 ton (~2000 lbs!)• Female giant squids are bigger than males!• Chitons are primarily shallow water organisms,
but they have been found in depths greater than 7,000 meters
• Chitons roll up into balls when threatened
Featured Show: Houdini Octopus
• Escaping the jaws of death through the size of a dime shaped hole!
• Show times:1:00 pm, 2:15 pm, 5:30 pm
Bibliography• Bay Scallops• http://en.wikipedia.org/wiki/Scallop• http://www.nwrc.usgs.gov/wdb/pub/species_profiles/82_11-012.pdf• Periwinkle Snails• http://www.britannica.com/EBchecked/topic/452111/periwinkle• http://en.wikipedia.org/wiki/Common_periwinkle• Sea Slugs- Headshield Slugs• http://www.seaslugforum.net/• http://en.wikipedia.org/wiki/Nudibranch• Octopus: • http://en.wikipedia.org/wiki/Octopus• Giant Squid: • http://en.wikipedia.org/wiki/Giant_squid• Lined Chitons:• http://en.wikipedia.org/wiki/Chiton • http://seawrold.org/animal-info/animal-bytes/animalia/eumetazoa/coelomates/protostomes/mollusca/chitons.pdf • Videos:• http://www.toxicjunction.com/get.asp?i=V1329• (Octopus Intelligence: Escaping outside a glass box)• http://videos.howstuffworks.com/discovery/29073-the-ultimate-guide-octopus-octopus-intelligence-video.htm• (Octopus Intelligence: Opening Lid to attain Crabs, Strength, Capabilities)• http://science.discovery.com/videos/ultimate-guide-to-octopus-shorts-giant-squid.html• (Giant Squid Interesting Facts)