Coleoidea - Wikipedia, the free encyclopedia(Site not responding. Last check: 2007-11-02)
SubclassColeoidea is the grouping of cephalopods containing all the primarily soft-bodied creatures.
Unlike its sister group the Nautiloidea, which has a rigid outer shell for protection, the coleoids have at most an internal bone or shell that is used for buoyancy or support.
The major dividings of Coleoidea are based upon the number of arms or tentacles and their structure.
en.wikipedia.org /wiki/Coleoidea (215 words)
Squid(Site not responding. Last check: 2007-11-02)
Being coleoidea means that their bony structure is internalized (in the octopus it is nonexistent); in squid there is a single flat bone plate buried within the soft tissue structure.
The mouth of the squid is beak-like and made of chitin, and contains the radula (the rough tongue common to all molluscs).
Cuttlefish have an internal calcareous shell, squids have a thin cartilaginous pen, and in octopuses the shell is absent.
Coleoidea have cells in their skin (chromatophores) that allow them to change colour rapidly, it is thought that colour change is one form of communication.
Palaeos Metazoa: Mollusca: Cyrtosoma: Coleoidea(Site not responding. Last check: 2007-11-02)
About 700 species of Recent coleoids are known (with probably more, especially deep sea forms, waiting to be discovered), and there are some 2500 fossil species, although some of these would be invalid taxa.
The Coleoidea first appear with certainty in the Early Carboniferous, but only become numerous during the Mesozoic.
A Linnean classification of the coleoids may be found here.
HACKED BY DOGUBEY & DeSPeRaDo - Chameleons of the Ocean(Site not responding. Last check: 2007-11-02)
One of the two groups of cephalopods that exist today is the Coleoidea, which is made up of the squids, octopods, cuttlefishes, and vampire squids.
The Cephalopoda is an ancient group of the Mollusca and have been among the dominant large predators in the ocean at various times in geological history.
One particularly interesting member of the Coleoidea is the Cuttlefish. They exhibit an amazing array or color schemes.
The reason for this disparity is the lack of a calcified shell (or a shell of any kind) in the recent coleoid groups.
There are also profound differences in life history, physiology, anatomy and ecology between the Coleoidea and the other extant cephalopod group, the Nautiloidea, implying that the radiation of the Coleoidea involved more than just modifying the shell.
Consequently, and in contrast to the other major molluscan clades, understanding coleoid phylogeny is heavily dependent on a variety of studies of extant taxa.
The penis in most male Coleoidea is a long and muscular end of the
www.vindia.info /c/Cephalopod.asp (592 words)
Cephalopoda Classification(Site not responding. Last check: 2007-11-02)
Coleoidea differ from other cephalopods by having only one pair of gills and one pair of nephridia (kidneys); all other cephalopods have 2 pairs of both gills and nephridia.
Coleoidea entered the fossil record during the Devonian and are still around today.
EVOLUTE-When the early whorls are still visible with a slight overlap of newer whorls over the older ones.
Family Loliginidae Loliginidae: inshore, calamari, and grass squid
www.biodatabase.de /squid (413 words)
Amazon.ca: Type Catalog of Fossil Invertebrates Mollusca: Coleoidea, Monoplacophora and Scaphopoda in the Yale Peabody: ...(Site not responding. Last check: 2007-11-02)
Amazon.ca: Type Catalog of Fossil InvertebratesMollusca: Coleoidea, Monoplacophora and Scaphopoda in the Yale Peabody: Books
Type Catalog of Fossil InvertebratesMollusca: Coleoidea, Monoplacophora and Scaphopoda in the Yale Peabody
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[For more, click on this link] Coleoidea is the grouping of cephalopod Marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles
The extinct and most primitive form, the BelemnoideaOrder of extinct dibranchiate cephalopods related to the surviving spirulas
