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Bembidion alaskense Lindroth 1962

David R. Maddison
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Containing group: Bembidion (Bracteon)

Adult External Characteristics

Members of this species are small or medium size (most specimens less than 6 mm long), with elytral mirrors on intervals 3 and 5, in some specimens on interval 4, and no distinct mirrors on intervals 6 and 7. The pronotum lacks a long basilateral carina, and is without a midlateral seta. The ventroapical setae of protarsomere 4 are widely separated; lateral projection on male protarsomere 3 lacking.

Male Genitalia

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Left: Lateral view. Right: Central Sclerite Complex

Comparison with Related Species

Compare with:

Distinguished from B. argenteolum by smaller size, duller luster, and generally darker appendages. The silver spots in B. alaskense are usually larger, extended onto intervals 2 and 4, with the seta in the spot located nearer the center of the spot (in B. argenteolum the setae are located nearer the anterior edge). Ventroapical setae of protarsomere 4 widely separated. For more detail, see B. argenteolum.

B. alaskense is duller, with much wider third elytral intervals, than B. semenovi.

From B. lapponicum and B. carinula, B. alaskense is distinct in lacking the midlateral pronotal seta, and more definite mirrors on interval 5 (and generally also 4).

Geographic Variation

Southern Alaskan specimens are somewhat darker and shinier than specimens from northern Alaska; Lake Baikal specimens are larger than Alaskan specimens.

Geographic Distribution

Known from Alaska, from the Alaska Peninsula to the Brooks Range; also in the region of Lake Baikal.

Habitat

On sandy river and lake shores. At Lake Brooks, Alaska, found on dark, volcanic sand, as shown in the following photograph:

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Nomenclature

Other Names for Bembidion alaskense Lindroth 1962

Title Illustrations
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Scientific Name Bembidion alaskense
Location Lake Brooks, Alaska, U.S.A.
Sex Male
Image Use creative commons This media file is licensed under the Creative Commons Attribution License - Version 3.0.
Copyright © 1995 David R. Maddison
About This Page

David R. Maddison
Oregon State University

Page: Tree of Life Bembidion alaskense Lindroth 1962. Authored by David R. Maddison. 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:

Maddison, David R. 1995. Bembidion alaskense Lindroth 1962. Version 01 January 1995 (under construction). http://tolweb.org/Bembidion_alaskense/382/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/

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