Cirrate shell
Cirrate octopuses possess a well-developed internal shell that supports their muscular swimming fins. This is in contrast to the more familiar, finless, incirrate octopuses, in which the shell remnant is either present as a pair of or absent altogether. The cirrate shell is quite unlike that of any other living cephalopod group and has its own dedicated set of descriptive terms. It is usually roughly arch- or saddle-shaped and is rather soft, being similar in consistency to cartilage. Each of the eight extant cirrate genera is characterised by a distinct shell morphology:
CephalopodCephalopod sizeCirrinaCirroctopus antarcticaCirroctopus glacialisCirrothauma magnaGrimpoteuthis abyssicolaGrimpoteuthis boyleiGrimpoteuthis challengeriGrimpoteuthis hippocrepiumGrimpoteuthis innominataGrimpoteuthis meangensisGrimpoteuthis tuftsiGrimpoteuthis wuelkeriOctopusOpisthoteuthisOpisthoteuthis albatrossiOpisthoteuthis borealisStauroteuthis gilchristiStauroteuthis syrtensis
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Cirrate shell
Cirrate octopuses possess a well-developed internal shell that supports their muscular swimming fins. This is in contrast to the more familiar, finless, incirrate octopuses, in which the shell remnant is either present as a pair of or absent altogether. The cirrate shell is quite unlike that of any other living cephalopod group and has its own dedicated set of descriptive terms. It is usually roughly arch- or saddle-shaped and is rather soft, being similar in consistency to cartilage. Each of the eight extant cirrate genera is characterised by a distinct shell morphology:
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Cirrate octopuses possess a we ...... nd horns of the cirrate shell.
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Cirrate octopuses possess a we ...... y a distinct shell morphology:
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Cirrate shell
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