Bembidion carinula
David R. Maddison
Adult External Characteristics
Pronotum with long, distinct basilateral carina extended to base.
Pronotum with midlateral setae. Elytral mirrors present on interval 3, in some specimens on intervals 4 and 5, but not on intervals 6 through 8.
Male Genitalia
Aedeagus slender, with narrow basal orifice.
Left: Lateral view. Right: Central Sclerite Complex
Comparison with Related Species
Compare with:
From the externally similar B. lapponicum and B. velox, males can be best separated by characters of the aedeagus, and females by the elongate second stylomeres (longer than 400 µm in B. carinula, around 200 µm in B. velox and B. lapponicum). Aedeagus of B. carinula slenderer, with narrower basal orifice; right lobe of CSC unridged; ostial microtrichial patch smaller; no apical "pillow" as in B. lapponicum. Dorsal plate of aedeagus with small sclerotized patch with dark, irregular borders; other Bracteon have dark dorsal plates (most notably B. hesperium), but in these the sclerotized region is more extensive. B. carinula members can be externally distinguished from B. lapponicum by the long basilateral pronotal carina, more convex pronota with more-rounded sides and less-divergent hind angles, and relatively narrower elytral interval 3. B. carinula members have the long basilateral carina of the pronotum lacking in B. velox.
Some specimens of B. carinula have been confused with B. balli, especially old, worn, B. carinula in which the mirrors are invisible or unclear; the basilateral pronotal carina and genitalia are the best distinguishing features.
Geographic Variation
Populations from west of Manitoba have a higher frequency of dark appendages; those from northern British Columbia and southern Yukon in general are more heavily microsculptured, with less regular basilateral carinae of pronota, and less convex pronota.
Geographic Distribution
Canada and U.S.A., from Newfoundland and New Jersey in the east, south to Kentucky, west to Iowa, British Columbia, and north to southeastern Yukon and western N. W. T.
Habitat
This species is found most often on upper, dry sand banks of rivers and lakes. In the east it is found on lake shores, in the north and west on shores of lakes and large rivers.
Nomenclature
- Bembidium carinula Chaudoir 1868. Lectotype male in MNP.
- Bembidion tuberculatum Notman 1929
Title Illustrations
| Scientific Name | Bembidion carinula |
|---|---|
| Location | Canada: Saskatchewan: North Saskatchewan River at Highway 3 |
| Sex | Male |
| Image Use |
 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 copyright © 1995 David R. Maddison
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Bembidion carinula .
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Citing this page:
Maddison, David R. 1995. Bembidion carinula . Version 01 January 1995 (under construction). http://tolweb.org/Bembidion_carinula/390/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/
