Complete

Brachioteuthidae Pfeffer 1908

Marek Lipinski and Richard E. Young
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Two genera are presently recognized in this family.
taxon links [up-->]Brachioteuthis [up-->]Slosarczykovia [down<--]Oegopsida Interpreting the tree
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Containing group: Oegopsida

Introduction

Brachioteuthids are small to medium sized squids (ca. 15 cm ML). The mantle is muscular but generally rather thin. The tentacular clubs are unusual: The dactylus is normal (four sucker series) but the proximal part of the manus is greatly expanded and carries numerous small suckers on long stalks. Another unusual feature is the compact digestive gland that is located well posterior to the cephalic cartilage in the mantle cavity (note the spindle-shaped digestive gland in this photo).

Little is known about the biology of brachioteuthids although Roper and Vecchione (1996) describe an accumulation of Brachioteuthis beanii observed from a submersible near the ocean floor at a depth of about 800 m. An AVI format video clip of a squid from this aggregration is available here.

Brief diagnosis

An oegopsid with ...

Characteristics

  1. Arms
    1. Arm suckers in two series.
    2. Buccal-crown connectives attach to ventral borders of arms IV.

  2. Tentacles
    1. Proximal region of manus of club greatly expanded with small suckers on long stalks in numerous irregular series.
    2. Dactylus of club with suckers in three or four series.
      Click on an image to view larger version & data in a new window
      Click on an image to view larger version & data in a new window

      Figure. Oral view of tentacular club of Brachioteuthis sp., western North Atlantic. Photograph by M. Vecchione.

  3. Head
    1. Beaks: Descriptions of Brachioteuthis sp. A (probably B. beanii) can be found here: Lower beak, upper beak. See Sloarczykovia page for beaks of S. circumantarctica.

  4. Funnel
    1. Funnel-locking cartilage with straight groove.

  5. Mantle
    1. Mantle muscular but thin.

  6. Fins
    1. Fins short; anterior lobes free.

  7. Photophores
    1. Single, large, ventral ocular photophore may or may not be present.

  8. Viscera
    1. Compact digestive gland located well posterior to cephalic cartilage.

Nomenclature

A list of all nominal genera and species in the Brachioteuthidae can be found here. The list includes the current status and type species of all genera, and the current status, type repository and type locality of all species and all pertinent references.

Life history

Members of the family have characteristic paralarvae. The paralarvae have long necks containing a fluid-filled sac that extends as a reservoir into the body (Young, et al., 1985). Contraction of the reservoir can greatly increase the length of the neck, thereby extending the head from the mantle.

Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window

Figure. Ontogenetic stages of Brachioteuthis sp., Hawaiian waters. Top left -  Egg. Top right - Dorsal view of hatchling, 2 mm ML, head retracted. Bottom left - Paralarva head and neck, 6 mm. Bottom right - Side view of the same hatchling, head retracted. Photographs by R. Young.

Paralarvae are illustrated below showing change in form and chromatophore patterns.
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window

Figure. Ventral and dorsal views of four paralarval stages of Brachioteuthis sp., Hawaiian waters. Scale bar = 1 mm. The thumbnail at the left shows the relative sizes of the four stages - click it for a larger view. Drawings from Young et al. (1985).

References

Roper, C. F. E. and M. Vecchione (1996). In-situ observations on Brachioteuthis: paired behavior, possibly mating. Am. Malac. Bull., 13(12):55-60.

Young, R. E., R. F. Harman and K. M. Mangold (1985). The eggs and larvae of Brachioteuthis sp. (Cephalopoda: Teuthoidea) from Hawaiian waters. Vie Milieu, 35: 203-209.

Title Illustrations
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Scientific Name Brachioteuthis beanii
Location Central North Atlantic
Specimen Condition Live Specimen
View Ventral
Copyright ©
About This Page


Sea Fisheries Institute, Cape Town, South Africa


University of Hawaii, Honolulu, HI, USA

Correspondence regarding this page should be directed to Marek Lipinski at

All Rights Reserved.

Citing this page:

Lipinski, Marek and Richard E. Young. 2008. Brachioteuthidae Pfeffer 1908. Version 06 July 2008. http://tolweb.org/Brachioteuthidae/19409/2008.07.06 in The Tree of Life Web Project, http://tolweb.org/

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