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Atlanta lesueurii Gray 1850

Atlanta lesueuri Souleyet 1852

Roger R. Seapy
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Containing group: Atlanta

Introduction

The maximal shell size of Atlanta lesueurii appears to vary geographically (from 2 mm in Hawaiian and eastern Australian waters to 6 mm in the tropical western Pacific). The shell is transparent, thin and fragile, with a smooth surface (lacking raised sculpture). The spire is very small, somewhat elevated and compact, consisting of about 2-1/2 whorls. Spire  sutures are deep, with the result that the whorls can be easily distinguished. After metamorphosis the outermost whorl enlarges and inflates rapidly and the keel becomes progressively taller, becoming very tall in large adults and having a truncate leading edge. The keel base and spire sutures are colorless. Eyes type b, with a large lens. Operculum type b. Radula type I, with a triangular shape; largest in the genus Atlanta. Geographic distribution is cosmopolitan in tropical to subtropical waters. Vertical distribution in Hawaiian waters restricted to upper 150 m, with most individuals in the upper 100 m and some evidence for nocturnal migration into the upper 50 m.

Diagnosis

Characteristics

  1. Shell
    1. Maximal shell size appears to vary geographically (=6 mm in the western tropical Pacific [Souleyet, 1852], 4 mm in the North Atlantic and Indian Oceans [Richter, 1986, 1974] and 2 mm off Hawaii [Seapy, 1990b] and eastern Australia [Newman, 1990]).
    2. Shell transparent with thin walls and keel
    3. Shell surface smooth, lacking any raised sculpture on the spire whorls
    4. Spire very small, compact and somewhat elevated, consisting of about 2-1/2 whorls; spire whorls distinct due to deep sutures (see tilted view of spire below)
    5. Keel tall, with a truncate leading edge
      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. Scanning electron micrographs of a 1.2 mm Atlanta lesueurii, viewed from the right side (upper left), the shell spire (upper right), the right side tilted (lower left), and the spire tilted (lower right). Scale bars = 0.5 mm (upper and lower left) and 100 µm (upper and lower right). ©

  2. Coloration: in Hawaiian waters juveniles lack body coloration (see second title illustration), but with growth the spire tissues take on pink (see first title illustration) to pinkish-violet (see photograph below) coloration
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    Click on an image to view larger version & data in a new window

    Figure. Specimen of a male Atlanta lesueurii retracted into its shell. Note the pinkish-violet  coloration of the spire tissues. Shell diameter = 1.5 mm. ©

  3. Eyes type b, with a large lens (see first title illustration; also, in enlarged view the transverse slit in the distal pigmented tissue of the right eye can be discerned)
  4. Operculum type b; thin
  5. Radula type I; largest in the genus Atlanta
    1. Shape triangular
    2. Lateral teeth monocuspid (Richter, 1961)
    3. Number of tooth rows can exceed 100 in older adults (Richter and Seapy, 1999)

Other Names for Atlanta lesueurii Gray 1850

References

Newman, L. J. 1990. The heteropod fauna (Prosobranchia, Heteropoda) of Australian and Papua New Guinean waters: a taxonomic and distributional review. Ph.D. thesis, University of Queensland, Australia.

Richter, G. 1961. Die Radula der Atlantiden (Heteropoda, Prosobranchia) und ihre Bedeutung f?r die Systematik und Evolution der Famiie. Zeitschrift f?r Morphologie und ?kologie das Tiere 50: 163-238.

Richter, G. 1974. Die Heteropoden der "Meteor" Expedition in den Indischen Ozean 1964/65. "Meteor" Forschungs-Ergibnisse Ser. D, No. 17, pp. 55-78.

Richter, G. 1986. Zur Kenntnis der Gattung Atlanta (II). Atlanta lesueuri Souleyet und Atlanta oligogyra Tesch (Prosobranchia: Heteropoda). Archiv f?r Mollusken-kunde 117: 19-31.

Richter, G. and R. R. Seapy. 1999. Heteropoda, pp. 621-647. In: D. Boltovskoy (ed.), South Atlantic Zooplankton. Leiden: Backhuys Publ.

Seapy, R. R. 1990. The pelagic family Atlantidae (Gastropoda, Heteropoda) from Hawaiian waters: a faunistic survey. Malacologia 32(1): 107-130.

Souleyet, [L. F. A.]. In: Eydoux, [F.] and Souleyet [L. F. A.], 1852. Voyage autour du monde execute pendant les annees 1836 et 1837 sur la corvette 'La Bonite'... Zoologie, col. 2. 664 pp. A. Bertrand, Paris.

Title Illustrations
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Scientific Name Atlanta lesueurii
Location Hawaiian waters
Specimen Condition Live Specimen
Sex Male
Life Cycle Stage adult
View right side
Size 1.3 mm shell diameter
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0.
Copyright ©
Scientific Name Atlanta lesueurii
Location Hawaiian waters
Specimen Condition Live Specimen
Life Cycle Stage juvenile
View right side
Size 0.7 mm shell diameter
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0.
Copyright ©
About This Page


California State University, Fullerton, California, USA

Correspondence regarding this page should be directed to Roger R. Seapy at

Page: Tree of Life Atlanta lesueurii Gray 1850. Atlanta lesueuri Souleyet 1852. Authored by Roger R. Seapy. The TEXT of this page is licensed under the Creative Commons Attribution 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:

Seapy, Roger R. 2009. Atlanta lesueurii Gray 1850. Atlanta lesueuri Souleyet 1852. Version 26 October 2009. http://tolweb.org/Atlanta_lesueurii/28765/2009.10.26 in The Tree of Life Web Project, http://tolweb.org/

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