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)