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Eogonatus Nesis, 1972

Eogonatus tinro Nesis, 1972

Tsunemi Kubodera, F. G. Hochberg, Richard E. Young, and Michael Vecchione
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Containing group: Gonatidae

Introduction

Eogonatus tinro was first described but not named by Fields and Gauley (1971) then described and named by Nesis (1972). The paralarval, early juvenile and mature adult stages are not known. E. tinro is uncommon and although generally thought to be a small species, may reach a rather large size (Katugin, personal communication).

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Figure. Ventral and side views of E. tinro, ca. 90 mm ML. Note the very large eyes, small tentacles and long tail. ©

Brief diagnosis:

A gonatid ...

Characteristics

  1. Arms
    1. Hooks in medial two armature series on arms I-III.

  2. Tentacles
    1. Tentacles present in subadults.
    2. Tentacular club without hooks.
    3. Suckers of tentacular club in numerous irregular series; suckers about equal in size.
    4. Proximal locking-apparatus of club with suckers and knobs medial to 2-3 small ridges and grooves.
    5. 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 the tentacle of E. tinro. Drawing from Nesis (1972).

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

      Figure. Oral view of the tentacular club of E. tinro, 65 mm ML, 45°07'N, 162°53'E. Drawing from Fields and Gauley (1971).

  3. Head
    1. Beaks. Descriptions can be found here: Lower beak; upper beak. See also this site.
    2. Radula with teeth in 5 series.

  4. Mantle
    1. Mantle tissue flabby.

  5. Fins
    1. Fins sagittate, drawn out posteriorly into a short tail.

  6. Photophores
    1. Photophores absent.

Nomenclature

Katugin, et. al. (2010) found that Gonatopsis okutanii Nesis, 1972 is a junior synonym of Eogonatus tinro Nesis, 1972. Both were described in the same paper, G. okutanii based on spent females, and E. tinro, based on young squid, but E. tinro appeared first.

Distribution

Type locality: 58°22.2'N, 174°55'W, Bering Sea, North Pacific.
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Figure. Distribution of E. tinro Dark pink area indicates known range; light pink area indicates inferred range. Chart modified from Okutani, et al. (1988). 

Other Names for Eogonatus tinro Nesis, 1972

References

Fields, W. G. and V. A. Gauley. 1971. Preliminary description of an unusual gonatid squid (Cephalopoda: Oegopsida) from the North Pacific. Jour. Fish. Res Bd Canada, 28:1796-1801.

Katugin, O. N., G. A. Shevtsov and M. A. Zuev. 2010. The morphology and biology of Gonatus tinro and Gonatopsis okutani (Teuthida: Gonatidae) indicate that they are conspecific. ICES Journal of Marine Science, 67: 14641477.

Nesis, K.N. 1972. Two New Species of Gonatid Squids from the North Pacific. Zoologichesky Zhurnal, 51(9): 1300-1307.

Okutani, T., T. Kubodera and K. Jefferts. 1983. Diversity, distribution and ecology of gonatid squids in the subarctic Pacific: A review. Bull. Ocean Res. Inst., Univ. Tokyo, No. 26 (1):150-192.

Title Illustrations
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Scientific Name Eogonatus tinro
Reference Nesis, K.N. 1972. Two New Species of Gonatid Squids from the North Pacific. Zoologichesky Zhurnal, 51(9):1300-1307.
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Copyright © 2004 Zoologichesky Zhurnal
About This Page


National Science Museum, Tokyo, Japan

F. G. Hochberg
Santa Barbara Museum of Natural History, Santa Barbara, California, USA


University of Hawaii, Honolulu, HI, USA


National Museum of Natural History, Washington, D. C. , USA

Page: Tree of Life Eogonatus Nesis, 1972. Eogonatus tinro Nesis, 1972. Authored by Tsunemi Kubodera, F. G. Hochberg, Richard E. Young, and Michael Vecchione. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

Citing this page:

Kubodera, Tsunemi, F. G. Hochberg, Richard E. Young, and Michael Vecchione. 2012. Eogonatus Nesis, 1972. Eogonatus tinro Nesis, 1972. Version 10 November 2012. http://tolweb.org/Eogonatus_tinro/19766/2012.11.10 in The Tree of Life Web Project, http://tolweb.org/

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