Animal Species:Diamondback Squid – Thysanoteuthis rhombus Troschel, 1857

A very strong swimmer, this squid has been known to occasionally jump onto boats.

Standard Common Name

Diamondback Squid

Identification

The common name for this species is derived from its large, distinctive diamond-shaped fin which extends along the whole length of the body. Unlike many other squids, Thysanoteuthis rhombus has no light organs. Their arms have two rows of suckers and wide protective webs along their length.

Size range

Body to 1m, weight up to 20kg.

Distribution

Found throughout tropical and sub-tropical waters world-wide.

Distribution by collection data

Biomaps map of Thysanoteuthis rhombus specimens in the Australian Museum collection.

What does this mean?

Habitat

Found near the surface of the open ocean, often in pairs or small schools.

Mating and reproduction

Like many other open-ocean squid, Thysanoteuthis rhombus females produce long sausage-like, transparent, floating egg masses. There is no planktonic stage, the young already possessing a full-length fin.

Classification

Species:
rhombus
Genus:
Thysanoteuthis
Family:
Thysanoteuthidae
Order:
Teuthida
Subclass:
Coleoidea
Class:
Cephalopoda
Phylum:
Mollusca

What does this mean?

References

Norman, M., (2000) Cephalopods- A World Guide, ConchBooks, Germany (Hackenheim)

Roper, C.F.E., M.J. Sweeney & C.E. Nauen, (1984) FAO species catalogue. Vol. 3. Cephalopods of the World: An annotated and illustrated catalogue of species of interest to fisheries, FAO Fish Synopsis, 125(3): 1-277.
 


Allison Runck
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