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Leachia dislocata Young, 1972

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

Introduction

Diagnosis

A Leachia ...

Characteristics

  1. Mantle
    1. Length of cartilagenous strip 12-17% of ML.
    2. Complex tubercule at anterior end of strip displaced medially.  image info

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

  2. 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.  image info

      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.

 image info

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.

 image info

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.

References

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
Scientific Name Leachia dislocata
Location off California
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.
Size 110 mm ML
About This Page

Richard E. Young

Dept of Oceanography
University of Hawaii
Honolulu, Hawaii 96822
USA

Katharina M. Mangold (1922-2003)


Citing this page:

Young, Richard E. and Mangold (1922-2003), Katharina M. 1999. Leachia dislocata Young, 1972. Version 01 January 1999 (under construction). http://tolweb.org/Leachia_dislocata/19588/1999.01.01 in The Tree of Life Web Project, http://tolweb.org/

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Leachia dislocata

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