Incirrina

Incirrina
An octopus species active at night in the coastal waters of northern East Timor
An unidentified octopus observed on East Scotia Ridge at a depth of 2,394 m (scale bar: 10 cm)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	Octopoda
Suborder:	Incirrina Grimpe, 1916 sensu Felley et al., 2001
Families
Amphitretidae Bolitaenidae Octopodidae Vitreledonellidae Superfamily Argonautoida Alloposidae Argonautidae Ocythoidae Tremoctopodidae
Synonyms
Incirrata Grimpe, 1916

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

Note: A new unnamed white species was discovered February 26, 2016 by NOAA’s Deep Discoverer about 2.5 miles below the ocean surface near the Hawaiian Archipelago.^[2]

References

1. Rogers, A. D.; Tyler, P. A.; Connelly, D. P.; Copley, J. T.; James, R.; Larter, R. D.; Linse, K.; Mills, R. A.; Garabato, A. N.; Pancost, R. D.; Pearce, D. A.; Polunin, N. V.; German, C. R.; Shank, T.; Boersch-Supan, P. H.; Alker, B. J.; Aquilina, A.; Bennett, S. A.; Clarke, A.; Dinley, R. J.; Graham, A. G.; Green, D. R.; Hawkes, J. A.; Hepburn, L.; Hilario, A.; Huvenne, V. A.; Marsh, L.; Ramirez-Llodra, E.; Reid, W. D.; Roterman, C. N. (2012). Eisen, Jonathan A., ed. "The discovery of new deep-sea hydrothermal vent communities in the Southern Ocean and implications for biogeography". PLoS Biology. 10 (1): e1001234. doi:10.1371/journal.pbio.1001234. PMC 3250512. PMID 22235194.
2. "Ghost octopod shows how little we know about deep-sea life". Smithsonian Science News -. Retrieved 2016-03-09.