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Bembidion lapponicum Zetterstedt 1828

David R. Maddison
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Containing group: Bembidion (Bracteon)

Adult External Characteristics

Elytra with mirrors on interval 3, in most specimens with fainter mirrors on 2 through 5, rarely with very faint mirrors on 6 and 7. The hind anges of the pronotum are prominent, and flare outward; they lack a long basilateral carina. Pronotum with a midlateral seta.

Male Genitalia

Aedeagus wide and short, with one prominent lobe (the "pillow") with large triangular scales. This lobe is visible towards the apex of the aedeagus when the internal sac is in repose.

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Left to right: Lateral view, "Pillow" of internal sac, Central Sclerite Complex

Comparison with Related Species

Compare with:

B. lapponicum can be difficult to distinguish using external characters from B. velox and B. carinula. The prothorax of B. lapponicum is flatter, with less rounded sides, and broader base with more protruded hind angles, and without the long basilateral carina of B. carinula. Interval 3 of the elytra is generally wider, with the silver spots wider and longer. Legs of B. lapponicum are darker in most specimens. Males of B. lapponicum have a distinctive lobe (called a "pillow"), covered with larger triangular scales, that rests near the tip of the aedeagus when the internal sac is in repose.

Geographic Variation

Specimens in the southern part of the range in North America are larger, with straighter, less-impressed striae, a generally smoother and shinier surface, with mirrors on intervals 2, 4, and 5 generally absent or very faint, and with a relatively narrow interval 3 than most northern specimens.

Lindroth (1962) gives a brief discussion of Palearctic variation.

Geographic Distribution

A Holarctic species, from northernmost Scandinavia throughout much of Russia, south to Mongolian Peoples' Republic, east to Kamtchatka. In North America, from Alaska east to the Anderson River in the North West Territories of Canada, south to scattered localities in Oregon, Wyoming, and central Saskatchewan. It is common in the north of its range in North America, but very rare in the south.

Habitat

On barren sand banks of large rivers, less frequently around small rivers, and rarely around lakes.

Nomenclature

Other Names for Bembidion lapponicum Zetterstedt 1828

Title Illustrations
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Scientific Name Bembidion lapponicum
Location Canada: British Columbia: Hope
Sex Male
Image Use creative commons This media file is licensed under the Creative Commons Attribution License - Version 3.0.
Copyright © 2004 David R. Maddison
About This Page

David R. Maddison
Oregon State University

Page: Tree of Life Bembidion lapponicum Zetterstedt 1828. 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 lapponicum Zetterstedt 1828. Version 01 January 1995 (under construction). http://tolweb.org/Bembidion_lapponicum/393/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/

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