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Containing group: Onychoteuthis

Introduction

Onychoteuthis banksii is the type species of the genus. At one point in time this species was considered to have a circumglobal distribution. We now recognize, however, that this species represents a complex of species. No useful diagnostic information was provided in the original description and subsequent discriptions are unreliable due to uncertainty in correct identification. As a result, this species cannot be identified at present. However, the holotype exists (British Museum) and is in fair condition so, ultimately, identification should be possible.

Characteristics

1. Photophores
   1. Intestinal photophores present. Posterior photophore 3 times diameter of anterior photophore.
   2. Ocular photophore a long whitish patch on ventral surface of each eyeball.
      image info

      Figure. Ventral view of the visceral photophores of O. banksii, holotype. Photograph by M. Vecchione.

2. Measurements of holotype
   1. Mantle length - 30 mm
   2. Arm lengths - All equal
   3. Fin length - 18 mm
   4. Fin width - 16 mm
   5. Club length - 14 mm
   6. Club hook numbers - 11 in ventral series, 11 in dorsal series.
   7. Largest hooks - Hooks V6 and V7
   8. Smallest mid-series dorsal hooks - Hooks D4 and D5

Comments

The holotype (BMNH 1986266) is in fair condition, slightly cleared and without chromatophores. The gladius and left tentacle are missing. Redescriptions of the holotype and specimens from the type locality are badly needed

Distribution

Type locality: Gulf of Guinea, eastern tropical Atlantic Ocean.

References

Leach, W.E. 1817. Synopsis of the Orders, Families, and Genera of the Class Cephalopoda. The Zoological Miscellany; being Descriptions of New or Interesting Animals, 3(30):137-141.