1. Phylum Mollusks MOLLUSKS
Welcome to Brooklyn Tech’s Zooquarium and Odditorium. We present to you...
Phylum Mollusks
MOLLUSKS
Ashley Hanooman Mariya Borogodova Siu Lam Koo Amanda Surujdeo Period 3

2. 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’

3. 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

4. Class Gastropoda: Periwinkle Snails
Scientific Name: Littorina littorea
Grows up to 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)

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. Bibliography Bay Scallops http://en.wikipedia.org/wiki/Scallop
Periwinkle Snails
Sea Slugs- Headshield Slugs
Octopus:
Giant Squid:
Lined Chitons:
Videos:
(Octopus Intelligence: Escaping outside a glass box)
(Octopus Intelligence: Opening Lid to attain Crabs, Strength, Capabilities)
(Giant Squid Interesting Facts)