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- <TITLE>A Giant Squid Is One Type Of Squid</TITLE>
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- <IMG SRC="giant.gif" WIDTH=128 ALIGN=RIGHT>
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- <H2>So, What is a Squid?</H2>
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- <P ID=T1 CLASS="yellowPlain" onclick="yellowP();">Cephalopoda
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- <P ID=T2 CLASS="yellowPlain" onclick="yellowP();">Coleoidea
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- <P ID=T3 CLASS="yellowPlain" onclick="yellowP();">Characteristics
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- <P ID=T4 CLASS="yellowPlain" onclick="yellowP();">Propogation
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- <P ID=T5 CLASS="yellowPlain" onclick="yellowP();">Food
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- <P ID=T6 CLASS="yellowPlain" onclick="yellowP();">Geography
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- The Cephalopoda is an ancient and very successful group of the Mollusca.
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- They have been among the dominant large predators in the ocean at various
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- times in geological history. Two groups of cephalopods exist today: The
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- extant Nautiloidea, containing the pearly nautiluses which are phylogenetic
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- relicts, are represented by only a few species, and the Coleoida.
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- The Coleoida group contains the squids, cuttlefishes, octopods and vampire
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- squids which are represented by about 700 species. Cephalopods are the most
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- active of the mollusks and some squids rival fishes in their swimming speed.
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- Although there are only about 700 species of living cephalopods, they occupy
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- a great variety of habitats in all of the world's oceans. Individual species
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- are often very abundant and provide major targets for marine fisheries.
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- <DIV ID=PG3 CLASS="yellowSmall">
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- Coleoida Characteristics
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- <OL>
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- <LI>A funnel derived from the molluscan foot.
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- <LI>Circumoral arms that are probably derived from the molluscan head.
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- <LI>Chitinous beaks.
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- <LI>Shell bearing a phragmacone and siphuncle
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- (lost in most Recent cephalopods).
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- <LI>Image-forming eyes.
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- </OL></DIV>
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- <P ID=PG4 CLASS="yellowSmall">All squid move through the ocean using a jet
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- of water forced out of the body
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- by a siphon. Many squid prefer to move about in very deep water where the water
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- temperature is colder. Recent studies indicate the blood of deep water squids
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- does not carry oxygen very well at higher temperatures. Those squid will
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- actually suffocate in warm water. There are as well warm water squid that swim
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- closer to the surface. Warm water squid are migratory because water temperature
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- changes more dramatically nearer to the surface.
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- <P ID=PG5 CLASS="yellowSmall">Squid are especially carnivorous.
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- They eat fish, other squid, and, in the case
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- of the largest species, whales.
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- <P ID=PG6 CLASS="yellowSmall">Different species of squid are seen in the seas
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- of the entire world.
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- They have evolved to take advantage of many different environmental
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- conditions. Their geography is more interesting at the species specific level.
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- </TD>
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- </TABLE>
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- Click on a word in the left column to learn more about squid on the right!
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