Brachioteuthis riisei

Comb-finned squid
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Coleoidea
Order:	Teuthida
Suborder:	Oegopsina
Family:	Brachioteuthidae
Genus:	Brachioteuthis
Species:	B. sicula
Binomial name
Brachioteuthis riisei (Steenstrup, 1882)
Synonyms
Entomopsis alicei Joubin, 1900 Entomopsis clouei de Rochebrune, 1884 Entomopsis velaini de Rochebrune, 1884 Tracheloteuthis behnii Steenstrup, 1882 Tracheloteuthis riisei Steenstrup, 1882 Verrilliola gracilis Pfeffer, 1884 Verrilliola nympha Pfeffer, 1884

Brachioteuthis riisei, also known as the common arm squid, is a species of squid in the family Brachioteuthidae.^[1]

Description

This is a small species. It is almost colourless except for small chromatophores scarcely distributed. It has a long, thin, cylindrical mantle which grows to from 10 to 17 cm in length. The fin is approximately 35-50% of the length of the mantle. It has weak muscles, yet is nektonic.^[2]

Larval stage

The neck of the larvae is long. Their arms have two rows of suckers, with the having multiple rows of smaller suckers in the tentacular club at the proximal hub.^[2]

Distribution

This species is widely distributed and is native to many parts of the Atlantic and Pacific Oceans, and the Mediterranean and Black Seas.^[3] Except within the boreal Pacific Ocen, this is likely a cosmopolitan species.^[2]

Habitat

Young animals live in the epi-mesopelagic zone, with adults occurring in the bathypelagic zone.^[2]

References

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