Ten-armed squids

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Ten-armed squids
Common squid (Loligo vulgaris)

Common squid ( Loligo vulgaris )

Systematics
without rank: Primordial mouths (protostomia)
Over trunk : Lophotrochozoa (Lophotrochozoa)
Trunk : Molluscs (mollusca)
Class : Cephalopods (cephalopoda)
Subclass : Octopus (coleoidea)
Superordinate : Ten-armed squids
Scientific name
Decabrachia
Boettger , 1952
Orders

The ten-armed cuttlefish (Decabrachia, also Decembrachiata or Decapodiformes) include the vast majority of the cephalopods (Cephalopoda) living today .

They are characterized by having ten arms, of which the 4th pair of arms, counting from the head , is transformed into tentacles . The suction cups are stalked, in contrast to the octopus's suction cups, which are seated broadly on the arm , and the functioning of the suction cups is different in the two groups. The suction cups of the ten-armed squid are reinforced at the edge by horn rings, in individual groups these horny suction cup rings can be further converted into hooks.

Systematics

The ten-armed squids (Decabrachia, Decapodiformes) form the sister group of the eight-armed squids (Vampyropoda), in which the Octobrachia and the vampire squid- like (Vampyromorpha) are grouped together. The subdivision of the ten-armed squid is not yet stable. While some authors distinguish up to four orders (and more), others only recognize two orders.

The following cladogram illustrates the parentage relationships:

 Cuttlefish  

 Belemnites (Belemnoidea) †


  New squid  
  Ten-armed squids  

 Cuttlefish (Sepiida)


   

 Post squirrel (Spirulida)


   

 Dwarf squid (Sepiolida)


   

 Squids (Teuthida)


Template: Klade / Maintenance / 3Template: Klade / Maintenance / 4

  Eight-armed squids  

 Vampire squid-like (Vampyromorpha)


  NN  

 Octopus (octopoda)


   

 Cirrus octopus (Cirroctopoda)






Footnotes

  1. ↑ a b Is placed by Jereb and Roper as a family to the order Sepiida

literature

  • Patrizia Jereb and Clyde FE Roper: Cephalopods of the World - An Annotated and Illustrated Catalog of Cephalopod Species Known to Date. Volume 1 Chambered Nautiluses and Sepioids (Nautilidae, Sepiidae, Sepiolidae, Sepiadariidae, Idiosepiidae and Spirulidae). FAO Species Catalog for Fishery Purposes, No. 4, 1: 1-262, Rome 2005, ISBN 9251053839
  • Xiaodong Zheng, Jianmin Yang, Xiangzhi Lin, Rucai Wang: Phylogenetic relationships among the Decabrachia cephalopods inferred from mitochondrial DNA sequences. Journal of Shellfisheries Research, 23: New Orleans 2004 ISSN  0077-5711