Overview

Brief Summary

Introduction

This species is known only from 16 juveniles (13-29 mm ML) taken in a single tow off Chile (Voss, 1982). It has not been reported since.

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Comprehensive Description

Nomenclature

This species was originally placed in the genus Grimpoteuthis.

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Characteristics

  1. Arms, web and suckers

      Figure. Oral view of arms and web of O. bruuni. From Voss, 1982

    1. Thickened web present on ventral side of each arm near web margin.
    2. Web extends further on dorsal side of arms.
    3. Web formula inconsistent.
    4. Arms subequal.
    5. 27-35 suckers on each arm I, number increases with size.
    6. Male arm: small row of small suckers around mouth, following 2-3 suckers increase in size, then 3 gigantic suckers, then small to about sucker 17 (near web margin) where 3-4 suckers somewhat enlarged, distally 7-8 suckers gradually decrease in size to tip.
    7. Female arm: Sucker size gradually increases then decreases; proximal suckers largest.
    8. Length of cirri less than diameter of largest suckers.

Comments

This description is taken from Voss, 1982. More details of the description of O. bruuni can be found here.

O. bruuni shares (where males are known) enlarged suckers in both proximal and distal fields that are the same on all arms with O. agassizii, O. chathamensis, O. grimaldii and O. hardyi. It differs from all of these species in the number of suckers in the distal field (2-3 vs 6-14); however, the specimens are not mature.

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Distribution

O. bruuni is known only from the type locality at 23°41'S, 70°34'W in the southeastern Pacific off Antofagasta, Chile.

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Life History and Behavior

Life Cycle

Life History

The smallest know specimen is 13 mm in ML (drawing below). The enlarged suckers of the proximal field are present at this size. The enlarged suckers of the distal field, however, are not present until 18-23 mm ML.

Figure. Dorsal view of O. bruuni, paratype, 13 mm ML. Drawing from Voss, 1982.

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