Bembidion carinulaDavid R. Maddison
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.
Aedeagus slender, with narrow basal orifice.
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.
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.
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.
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.
David R. Maddison
Oregon State University
Page copyright © 1995 David R. Maddison
Page: Tree of Life Bembidion carinula 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 carinula http://tolweb.org/Bembidion_carinula/390/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/. Version 01 January 1995 (under construction).