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Mollusks 6

Page history last edited by Stephan Arthur Joanides 13 years ago

 

By Nicole, Shadi and Cole

 


 

 

                                                                                   http://www.oceaninn.com/the-nature-preserve/mollusks/                                                                                  http://www.google.com/imgres?imgurl=http://universe-    review.ca/I10-82                                                                                                                                                                                                                      This is a diagram of a mollusk.

 This is a mollusk that is in its natural habitat.  

      

     The mollusk is an invertebrate. An invertebrate is an animal lacking a backbone, such as an arthropod, mollusk, annelid, ect. The Mollusca family is a large phylum of invertebrate animals. There around 85,000 kinds of mollusks.The phylum Mollusca is the largest and most diverse phylum of animals next to arthropods. Mollusks can be found in nearly every ecosystem on Earth, from high, barren mountains to grassy plains, lakes, rivers and in all seas and oceans. New species of mollusks are being encountered and named every year as new discoveries are made in the ocean and tropical rainforests.

 

Mollusks have three body regions.

1. The head contains the "brain" and the sense organs. 
2. The "visceral mass" contains the internal organs. 
3. The "foot" is the muscular part of the body.

The body of a mollusk is generally composed of the shell and the fleshy, living part. The fleshy parts of a mollusk can be further divided into the foot and the visceral mass. The foot is a distinctive molluscan feature, adapted in a variety of ways for locomotion. The visceral mass includes the organs for digestion, circulation, reproduction, and respiration. The visceral mass also includes two outside flaps of tissue called the mantle, which secretes the calcareous shell and encloses a mantle cavity. The fluid in the mantle cavity, which in aquatic mollusks is continually replaced with water from the outside, carries away excess water, ions and wastes, and helps circulate nutrients and oxygen. Another structure unique to mollusks, found in most groups except bivalves and a few others is the radula. In most forms the radula is a rasping organ near the mouth variously modified for special feeding techniques.

 

These two structures – the mantle and radula – are found in Mollusca and nowhere else in the animal kingdom.

 

 

     

 

 

 

   Some different types of mollusks include clams, scallops, slugs, snails and even the octopus. Some mollusks live on land, such as the snail and slug. Other mollusks live in water, such as the oyster, mussel, clam, squid and octopus.Land living mollusks, like the snail, move slowly on a flat sole called a footOcean living mollusks move or swim by jet propulsion. They propel themselves by ejecting water from their body. 

Other ocean living mollusks, like the oyster, attach themselves to rocks or other surfaces, and can't move. They feed by filtering small food particles from water that flows through them.

 

     Maybe you think that snails, clams, mussels, squid, and octopods are very different. Yet, they are all in the same category of animals known as mollusks and are structurally similar. Mollusks are some of the most well known of invertebrate sea creatures.                                                                                  

 

                                                                                                                                            

              Mollusk

http://chemistry.csudh.edu/faculty/jim/cozaugo4-600/octopus.jpg       http://www.google.com/imgres?imgurl=http://www.allthesea.com/

An octopus is a type of mollusk.        This is an image of many different types of mollusks.                                                  

http://www.mbgnet.net/salt/coral/animals/mollusk.htm 

This is what one of the many types of sea mollusks look like. 

 

Reproduction

 

Most have external fertilization.

In tentacled mollusks and some some snails fertilization is internal.

Some snails are hermaphroditic and engage in cross fertilization.

Hermaphroditic oysters can switch from male to female and vice-versa.

 

There are three types of mollusks the gastropods, bivalves and cephalopods.

 

The largest type are the gastropods such as conchs, snails and whelks.

They have one shell, which is often coiled. Single-shelled animals first appeared in

the fossil record 500 million years ago. Some gastropods, such as limpets and

abalone have flat saucer-like shells. Snails are the only mollusks to have the their

species on land as well as freshwater and marine habitats.

 

Bivalves, such as oysters, clams, and scallops, are mollusks that have a two hinged shell.

It protects the soft bodied creature from most hungry predators. Bivalves often

attach themselves to wharves and rocks with thread-like anchors. 

 

The third type of mollusks are cephalopods, such as the squid and octopus.

They’re also the most active. They have a very high intelligence and evolved away from

the need of a shell for protection and instead are usually fairly fast and quite oten have a

protection method of an inky spray.

 

Mollusk Quiz!

1. Is a sea star a mollusk?

 

2. Is a mollusk a vertebrate?

 

3. Do mollusks only live on land?

 

4. How do mollusks move if they live in the water?                                                                                                                

5. How do most mollusks reproduce?

 

6. What is the mantle?

 

7. Around how many mollusk species are there?

 

8. What is the largest phylum of animals?

 

                                                          clam                             http://nashzoology.ning.com/forum/topics/mollusk-classification-choose?id=2223964%3ATopic%3A10459&page=2     http://www.kidport.com/reflib/science/animals/Mollusks.htm

This is an image of a snail, which is a mollusk.                                                                                           Mollusks come in all different shapes and sizes. Here is one with a unique shape. 

 

 

http://videos.howstuffworks.com/animals/mollusks-videos.htm -Shadi

http://news.nationalgeographic.com/news/2006/09/060906-octopus-video.html -Shadi

 

 

This video has a great explanation of what a mollusk is.

                                       

                                                                                                                                                                                           http://fw.ky.gov/swgupdate.asp                                                      http://www.noelgreen.com/2005/10/star-trek-food.html

                                                                                                                  This is a picture of several mollusk shells together.                         Mollusks are actually edible.

This is an image of many mollusk shells

http://www.kqed.org/quest/blog/2007/12/19/mollusk-madness-can-we-collect-shells-responsibly/ 

This is an image of a mollusk lying in the ocean. 

 

Mollusk        

 

           Photo1

http://www.infovisual.info/02/008_en.html                                                                                                                                                                  http://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=1009                                                                                                                                                       

This is a detailed diagram of the different parts of a mollusk.                                                This is a picture of a mollusk on both sides.

This is a video that has fun facts and is entertaining to listen to.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESOURCES

http://www.oceaninn.com/the-nature-preserve/mollusks/

http://www.kidport.com/reflib/science/animals/Mollusks.htm

http://www.mbgnet.net/salt/coral/animals/mollusk.htm

http://www.youtube.com/watch?v=0a7j5prL8hc

http://www.youtube.com/watch?v=jsxAr_yrJtM

http://www.google.com/imgres?imgurl=http://universe-review.ca/I10-82-clam.jpg&imgrefurl=http://universe-review.ca/R10-33-anatomy.htm&h=304&w=446&sz=43&tbnid=Dkdw3-BqTw_Q_M:&tbnh=87&tbnw=127&prev=/images%3Fq%3Ddiagrams%2Bof%2Bmollusks&zoom=1&q=diagrams+of+mollusks&usg=__H--wg1aNuT0MhzDBAJhDySaGKt4=&sa=X&ei=YJZ6TaCZHM_9rAHa97AJ&ved=0CCQQ9QEwBA

http://www.freesparkle.com/index.php?palabra=Mollusk+Madness&tipo=15 

http://www.google.com/imgres?imgurl=http://www.allthesea.com/img/sea-shell-mollusk-01.gif&imgrefurl=http://www.allthesea.com/Sea-Shell.html&h=473&w=359&sz=25&tbnid=Ke81HRbPth69IM:&tbnh=258&tbnw=196&prev=/images%3Fq%3Dmollusk%2Bimages&zoom=1&q=mollusk+images&usg=__njZp7O0DStBmq-TkBdNnN6ob9eM=&sa=X&ei=P6B6TYuOAoLZrAHfoen2BQ&ved=0CB0Q9QEwAg

 

 

 

 

 

 

 

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