Overview

Brief Summary

Introduction

O. albatrossi was originally described from four specimens and placed in the genus Stauroteuthis. The enlarged suckers, however, clearly show that it belongs in the genus Opisthoteuthis. Another similar species of Opisthoteuthis (O. californiana) occurs in Japanese waters but has never been closely compared with O. albatrossi because of the latter's incorrect generic placement.

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Comprehensive Description

Characteristics

Figure. Oral view of the dordal arms of Opisthoteuthis albatrossi. Drawing from Sasaki, 1929.

  1. Arms and web
    1. Male: Each arm I with 3 greatly enlarged suckers (plus 2 or 3 suckers of intermediate size) in distal field.
    2. Proximal field absent (Nesis, 1982/87).
    3. Suckers number "80 or more" on each arm.
    4. Largest arm suckers (except for distal field of arms I) are suckers 6-7.
    5. Web along ventral arm margins with "faint nodule-like thickening."

Comments

More details of the description of O. albatrossi can be found here.

O. albatrossi and O. californiana are distinctive among species of Opisthoteuthis in having greatly enlarged suckers in the distal field only on arms I. The holotype of O. albatrossi is a young male and the proximal field may not have developed. These two species could be synonyms (Hochberg, pers. comm.)

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Distribution

Type locality: Off Kinkasan, Rikuzen Prov., Japan. Northern Pacific boreal species, known from Sea of Okhotsk, Bering Sea and Southern California (Nesis, 1982/87).

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Life History and Behavior

Life Cycle

Life History

Mature ovarian egg measured 10 x 7 mm.

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