Transcript Mollusca - Mrs. Theofilos` Biology Page

Mollusca
By: Miranda & Ashley :]
Mollusca Characteristics
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Bilaterally symmetrical.
Body has more than two cell layers, tissues and organs.
Body without cavity.
Body possesses a through gut with mouth and anus.
Body monomeric and highly variable in form, may
possess a dorsal or lateral shells of protein and
calcareous spicules.
• Has a nervous system with a circum-oesophagal ring,
ganglia and paired nerve chords.
Ramel, Gordon. "The Molluscs (Phylum Mollusca)." The Earth Life Web. Web.
04 Apr. 2011. <http://www.earthlife.net/inverts/mollusca.html>.
Mollusk Facts
• Mollusks eat a wide range of material.
• Mollusks live in most environments.
• After the Arthropods the Molluscs are the
most successful of the animal phyla in
terms of numbers of species.
• There are about 110,000 species known to
science most of which are marine.
Bivalvia
• Bivalves have shells made up of 2 asymmetrically rounded halves
called valves that are mirror images of each other
• They need fresh water to breathe, reproduce and eat
• Most species burrow into mud and sand.
• Most bivalves eat bits of plants and animals floating in the water.
• A few species collect food from the bottom
• Others absorb nutrients directly into their bodies
http://animals.jrank.org/pages/1908/Bivalves-Bivalvia.html
Bivalves: Bivalvia - Physical Characteristics, Behavior And
Reproduction, Bivalves And People, Conservation Status, Blacklipped Pearl Oyster (pinctada Margaritifera): Species Accounts GEOGRAPHIC RANGE, HABITAT, DIET
Giant Clam(Bivalvia)
Phylum:Mollusca
Class:Bivalvia
Subclass:Heterodonta
Order: incertae sedis
Family:Tridacninae
Genus:Tridacna
Species:T. gigas
Giant Clam
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The Giant Clam is the largest immobile mollusc in the world, reaching up to
6 feet in length.
Once a Giant Clam settles somewhere it stays there for the rest of its life.
They live in tropical waters, and feed on plant and animal matter.
Giant clams are eaten by humans
Giant clams generally have bad interaction with humans because humans
decrease the clam population with hunting. :]
Human pollution affects Giant Clams because humans pollute the water
they live in
They are endangered
They are hunted by humans for a muscle that is eaten in many countries.
Marine Parks throughout the world are working to protect clams.
• Clam Video :]
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"Giant Clam." True Wild Life True Wild Life. Web. 25 Mar. 2011.
Source
Gastropods
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Gastropods are the largest variety of mollusks
There are over 90,000 different types of Gastropods.
They occupy every habitat on earth
It is the only class to contain species that have ventured
permanently on to land.
• Over 15,000 fossil forms have been described and over
90,000 species exist today
• Gastropods exhibit the least change from the ancestral
molluscan plan of all the molluscs.
G. Atlanticus
Kingdom:Animalia
Phylum:Mollusca
Class:Gastropoda
Superfamily:Aeolidioida
Family:Glaucidae
Genus:Glaucus
Common Name:
Nudibranch
Glaucus Atlanticus
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A species of medium-sized blue sea slug
They are between 5 and 8 centimeters in length
They live Tropical waters
They prey on other larger pelagic organisms like the dangerously venomous
Portuguese man o’ war
If there is no food around, they will resort to cannibalism and eat other G.
Atlanticus
They float upside down
They are not eaten by humans
Human pollution affects the water they live in
They are not endangered
Humans havent really taken any steps to protect them
They are not hunted by humans
Human interaction is neutral.
Cephalopods
• Cephalopods are found in all of the worlds
oceans
• Cephalopods have 3 hearts, and blue blood
• All species of cephalopods are marine
• There are 800 living types
• They grow fast, reproduce, and die over a short
period of time.
• They were once one of the dominant life forms
of the oceans.
Giant Squaid
Architeuthis dux
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Teuthida
Suborder: Oegopsina
Family: Architeuthidae
Genus: Architeuthis
Species: Architeuthis dux
Geographic Range
Giant Squid Facts
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Giant squids can grow to over 26 feet.
Giant squid eat hoki fish (the same fish used in McDonalds filet o fish
sandwiches. Yum:]), and shrimp
They are the largest invertebrate on earth
They have the largest eyes in the animal kingdom, measuring 10 inches in
diameter
They move with fins, and use their funnel as a propulsion system, drawing
water main part of the body, and forcing it out the back
Giant squid carcasses have been found in all the worlds oceans
Giant squids are usually not eaten by humans, but it porbably is possible.
Because they live where humans rarely go, its hard to tell whether they are
endangered or not.
There are no protection efforts for the giant squid
Resources :]
• Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S.
Hammond, and T. A. Dewey. 2008. The Animal Diversity
Web (online). Accessed March 25, 2011 at
http://animaldiversity.org.
• Postlethwait, John H., and Janet L. Hopson. Modern
Biology. Orlando: Holt, Rinehart and Winston, 2006.
Print.