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Cameroceras
''Cameroceras'' ("chambered horn") is a genus of extinct, giant orthoconic cephalopod that lived during the Ordovician period, 470 to 460 million years ago.〔(【引用サイトリンク】url=http://www.trilobites.fr/faune/cephalopode/cameroceras_sp/cameroceras_sp_f.htm )〕
==Description==
''Cameroceras'' is a cephalopod, a taxon of molluscs that includes the octopuses, squids and cuttlefish. From comparison with living cephalopods, particularly the shelled chambered nautilus, some inferences about the biology of ''Cameroceras'' can be made. The head of the animal would have been soft muscular tissue situated at the opening of the hard cone-like shell, with the mantle (main body) lying within the shell for protection. Tentacles would have grown from the base of the head like in a modern nautilus, and these tentacles would have been used to seize and manipulate prey. At the base of these tentacles within the buccal mass (analogous to the mouth) a hard keratinous beak would have bitten into the bodies of its prey, and is assumed to have been strong enough to breach the prey's exoskeleton or shell. Within the beaks of modern cephalopods a radula, or ‘toothed’ tongue is used to rasp out soft tissue from within the preys shell.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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