Bembidion lapponicumDavid R. Maddison
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.
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.
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.
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.
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.
On barren sand banks of large rivers, less frequently around small rivers, and rarely around lakes.
- Bembidion jenisseense
- Bembidion latiusculum
- Bembidion pugetanum
David R. Maddison
Oregon State University
Page copyright © 1995 David R. Maddison
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Citing this page:
Maddison, David R. 1995. Bembidion lapponicum http://tolweb.org/Bembidion_lapponicum/393/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/. Version 01 January 1995 (under construction).