Idioteuthis tyroi
Encyclopedia
Idioteuthis tyroi is a species of whip-lash squid
Whip-lash squid
The Mastigoteuthidae, also known as whip-lash squid, are a family of small deep-sea squid. Approximately 20 known species in two genera are represented, with members found in both the mesopelagic and bathypelagic zone of most oceans...

. It is known from a single paralarva of 15 mm mantle
Mantle (mollusc)
The mantle is a significant part of the anatomy of molluscs: it is the dorsal body wall which covers the visceral mass and usually protrudes in the form of flaps well beyond the visceral mass itself.In many, but by no means all, species of molluscs, the epidermis of the mantle secretes...

 length (ML). The paralarva is unique in having expanded tentacular clubs, although few mastigoteuthids have described paralarvae.
Measurements of holotype
(Salcedo-Vargas, 1997)
Mantle length 15 mm
Mantle width 3.5 mm
Head length 3.5 mm
Head width 2.5 mm
Fin length 8 mm
Fin width 12 mm
Arm I length 1.2 mm
Arm II length 1.8 mm
Arm III length 1.2 mm
Arm IV length 2.5 mm
Tentacle length 6 mm
Club length 3.5 mm
Eye diameter 1.3 mm
Lens diameter 0.8 mm

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