Thysanoteuthis rhombus

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Diamond squid
Thysanoteuthis rhombus.jpg
Scientific classification edit
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Oegopsida
Family: Thysanoteuthidae
Genus: Thysanoteuthis
T. rhombus
Binomial name
Thysanoteuthis rhombus
  • Cirrobrachium danae
    Joubin, 1933
  • Cirrobrachium filiferum
    Hoyle, 1904
  • Sepioteuthis major
    Gray, 1828
  • Thysanoteuthis elegans
    Troschel, 1857

Thysanoteuthis rhombus, also known as the diamond squid or diamondback squid, is a large species of squid growing to 100 cm in mantle length[3] and a maximum weight of 30 kg,[4] although it averages around 20 kg.[5] The species occurs worldwide, throughout tropical and subtropical waters. Arms have two series of suckers, whereas the tentacular clubs have four. It lacks photophores. T. rhombus is named for its fins, which run in equal length along the mantle, giving the appearance of a rhombus. The species is commercially fished in Japan, specifically in the Sea of Japan and Okinawa.[6] The species is one of the only cephalopods observed exhibiting pair-like mating relationships. If one member of a male-female mating pair is caught by squid fishermen the other will likely remain in the area until it is also caught.

See also[edit]


  1. ^ Barratt, I. & Allcock, L. (2014). "Thysanoteuthis rhombus". The IUCN Red List of Threatened Species. 2014: e.T163228A986608. doi:10.2305/IUCN.UK.2014-1.RLTS.T163228A986608.en. Downloaded on 18 March 2018.
  2. ^ Julian Finn (2016). Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. "Thysanoteuthis rhombus Troschel, 1857". MolluscaBase. World Register of Marine Species. Retrieved 18 March 2018.
  3. ^ Roper C.F.E., M.J. Sweeney & C.E. Nauen 1984. Cephalopods of the world. Food and Agriculture Organization, Rome, Italy.
  4. ^ Miyahara, K., K. Fukui, T. Ota & T. Minami 2006. Laboratory observations on the early life stages of the diamond squid Thysanoteuthis rhombus. Journal of Molluscan Studies 72(2): 199–205. doi:10.1093/mollus/eyi068
  5. ^ Butler, L.-A. 2010. Enormous squid not chokka. Weekend Post, 27 May 2010.
  6. ^ Bower, John R. and K. Miyahara. 2005. The diamond squid (Thysanoteuthis rhombus): A review of the fishery and recent research in Japan. Fisheries Research 73(1–2): 1–11. doi:10.1016/j.fishres.2005.01.020

External links[edit]