Ten-armed squids
Ten-armed squids | ||||||||||||
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Common squid ( Loligo vulgaris ) |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Decabrachia | ||||||||||||
Boettger , 1952 | ||||||||||||
Orders | ||||||||||||
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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.
- Post squirrel (Spirulida)
- Cuttlefish (Sepiida)
- Dwarf squid (Sepiolida)
- Squids (Teuthida)
The following cladogram illustrates the parentage relationships:
Cuttlefish |
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Footnotes
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