Coleoidea

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[[Bactritida|<==]]Coleoidea
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'''Coleoidea''' comprise a subclass of [[Cephalopoda|cephalopods]] in which the shell is absent or internal and which have upwards of ten arms, in which case two are termed tentacles, in as many as five pairs which protrude from the head and encircle the mouth. Recent Coleoids are dibranchiate, that is have two gills as opposed to the four found in recent [[Nautiloidea|nautiloids]] represented by ''Nautilus''. Coleoids are also referred to as neocephalopods.
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The Coleoidea has been divided into two principle groups. infraclasses or superorders, the Belemnoidea and Neocoleoidea. Recent coleoids are Neocoloidea and are further divided into the ten armed Decapodiformes which includes squids, octopods, cuttle-fishes, and Spirula, and the eight armed Octopodiformes, octopuses.
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[[Bactritida|<==]]Coleoidea
     |  ''i. s.'': ''Onychoteuthis borealijaponicus''
     |  ''i. s.'': ''Onychoteuthis borealijaponicus''
     |        ''Gonatus'' [Gonatidae]
     |        ''Gonatus'' [Gonatidae]

Revision as of 15:47, 20 April 2010

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