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Incirrina or Incirrata is a suborder of the order Octopoda. The suborder contains the classic "benthic octopuses," as well as many pelagic octopus families, including the paper nautiluses. The incirrate octopuses are distinguished from the cirrate octopuses by the absence in the former of the "cirri" filaments (found with the suckers) for which the cirrates are named, as well as by the lack of paired swimming fins on the head, and lack of a small internal shell (the "shell" of ''Argonauta'' species is not a true shell, but a thin calcite egg case). ==Classification== *CLASS CEPHALOPODA * *Subclass Nautiloidea: nautilus * *Subclass †Ammonoidea: ammonites * *Subclass Coleoidea * * *Superorder Decapodiformes: squid, cuttlefish * * *Superorder Octopodiformes * * * *Family †Trachyteuthididae (''incertae sedis'') * * * *Order Vampyromorphida: vampire squid * * * *Order Octopoda * * * * *Genus †''Keuppia'' (''incertae sedis'') * * * * *Genus †''Palaeoctopus'' (''incertae sedis'') * * * * *Genus †''Paleocirroteuthis'' (''incertae sedis'') * * * * *Genus †''Pohlsepia'' (''incertae sedis'') * * * * *Genus †''Proteroctopus'' (''incertae sedis'') * * * * *Genus †''Styletoctopus'' (''incertae sedis'') * * * * *Suborder Cirrina: finned deep-sea octopus * * * * *Suborder Incirrina * * * * * *Family Amphitretidae: telescope octopus * * * * * *Family Bolitaenidae: gelatinous octopus * * * * * *Family Octopodidae: benthic octopus * * * * * *Family Vitreledonellidae: glass octopus * * * * * *Superfamily Argonautoida * * * * * * *Family Alloposidae: seven-arm octopus * * * * * * *Family Argonautidae: argonauts * * * * * * *Family Ocythoidae: tuberculate pelagic octopus * * * * * * *Family Tremoctopodidae: blanket octopus 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Incirrina」の詳細全文を読む スポンサード リンク
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