Thysanoteuthis rhombus

Thysanoteuthis_rhombus_(Merculiano)

Thysanoteuthis rhombus, commonly known as the diamond squid or diamondback squid, is a species of squid in the family Thysanoteuthidae. It is notable for its large size and distinctive rhomboidal fins, which extend along much of the length of its mantle.

Description

Thysanoteuthis rhombus can reach a mantle length of up to 100 cm, making it one of the larger species of squid. The body is elongated and cylindrical, with a pair of large, rhomboidal fins that are nearly as long as the mantle itself. These fins give the squid its common name due to their diamond-like shape. The coloration of T. rhombus is typically a reddish-brown, with the possibility of bioluminescent photophores scattered across its body.

Distribution and Habitat

Thysanoteuthis rhombus is found in tropical and subtropical oceans worldwide. It is a pelagic species, often inhabiting the open ocean at depths ranging from the surface to about 1,000 meters. This squid is known to migrate vertically, coming closer to the surface at night to feed.

Behavior and Ecology

Thysanoteuthis rhombus is a solitary species, although it has occasionally been observed in pairs. It is a fast swimmer, using its large fins for propulsion. The diet of T. rhombus primarily consists of fish, crustaceans, and other cephalopods. Predators of T. rhombus include larger fish, marine mammals, and seabirds.

Reproduction

The reproductive habits of Thysanoteuthis rhombus are not well-documented. Like other squids, it is assumed that they engage in a form of external fertilization, where the male transfers spermatophores to the female, who then lays eggs in gelatinous masses.

Economic Importance

Thysanoteuthis rhombus is of minor commercial importance. It is occasionally caught as bycatch in fisheries targeting other species. In some regions, it is consumed locally and can be found in markets.

Conservation Status

The conservation status of Thysanoteuthis rhombus has not been extensively studied. However, it is not currently listed as threatened or endangered. The primary threats to this species are likely to be overfishing and habitat degradation.

See Also

• Cephalopod
• Squid
• Marine biology