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Leachia dislocata Young, 1972

Richard E. Young and Katharina M. Mangold (1922-2003)
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Containing group: Leachia

Introduction

Brief diagnosis:

A Leachia with ... 

 

Characteristics

  1. Head
    1. Beaks: Descriptions can be found here: Lower beak; upper beak.

  2. Mantle
    1. Length of cartilagenous strip 12-17% of ML.
    2. Complex tubercule at anterior end of strip displaced medially.
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      Click on an image to view larger version & data in a new window

      Figure. Ventral view of the anterior end of one cartilagenous strip on the mantle of L. dislocata, 136 mm GL. Drawing from Young, 1972.

  3. Photophores
    1. On the adult eyeball, eight photophores comprise the outer series and the inner series (i.e., near the lens) consists of 7 photophores: two small photophores dorsal to the lens and five, three large organs alternate with two small ones, ventral to it.
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      Click on an image to view larger version & data in a new window

      Figure. Two views of the ocular photophores of L. dislocata, 143 mmm GL.

Comments

More details of the description can be found here.

The distinctive displaced tubercule on the cartilagenous strip is shared with Leachia pacifica.

Life History

The paralarva or the "pyrgopsis stage" has stalked eyes and few if any ocular photophores. The mature female has sessile eyes with a full compliment of photophores, relatively longer arms and photophores on the tips of arms III.

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

Figure. Ventral views of two life-history stages of L. dislocata, off southern California. Top - Adult female, 145 mm GL. Bottom - Paralarva, 27 mm GL. Drawings from Young (1972).

Ocular photophores are gradually added through growth.

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

Figure. Development of photophore compliment on eyes with growth in L. dislocata. Two views of each eye shown. A - 16 mm GL. B - 22 mm GL. C - 25 mm GL. D - 35 mm GL. E - 44 mm GL. F - 64 mm GL. G - 125 mm GL (holotype). H - 143 mm GL. Drawings from Young (1972).

Distribution

The type locality is 32°35'N, 118°06'W, off southern California in the eastern North Pacific. Also known from off the Pacific coast of Baja California at 27°45'N (Okutani, 1979).

References

Okutani, T. 1974. Epipelagic decapod cephalopods collected by micronekton tows during the EASTROPAC expeditions, 1967-1968 (systematic part). Bull. Tokai Reg. Fish. Res. Lab., 80: 29-118.

Voss, N. A. 1980. A generic revision of the Cranchiidae (Cephalopoda; Oegopsida). Bull. Mar. Sci. 30: 365-412.

Young, R. E. 1972. The systematics and areal distribution of pelagic cephalopods from the seas off Southern California. Smithson. Contr. Zool., 97: 1-159.

Title Illustrations
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Click on an image to view larger version & data in a new window
Scientific Name Leachia dislocata
Location Off Southern California
Specimen Condition Live Specimen
View Side
Size 100 mm ML (estimate)
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0.
Copyright ©
Scientific Name Leachia dislocata
Reference from Young, R. E. 1972. The systematics and areal distribution of pelagic cephalopods from the seas off Southern California. Smithson. Contr. Zool. 97:1-159.
View Ventral
Size 110 mm ML
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0.
Copyright ©
About This Page


University of Hawaii, Honolulu, HI, USA

Katharina M. Mangold (1922-2003)
Laboratoire Arago, Banyuls-Sur-Mer, France

Page: Tree of Life Leachia dislocata Young, 1972. Authored by Richard E. Young and Katharina M. Mangold (1922-2003). 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:

Young, Richard E. and Katharina M. Mangold (1922-2003). 2014. Leachia dislocata Young, 1972. Version 21 January 2014 (under construction). http://tolweb.org/Leachia_dislocata/19588/2014.01.21 in The Tree of Life Web Project, http://tolweb.org/

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