Water Scavenger Beetle - Tropisternus natator
Guelph, Wellington, Ontario, Canada
September 23, 2006
Size: 9.5 mm
View of the underside showing the sternal keel. I'm not familiar with Hydrophilids ... does this keel actually serve a function?
Tropisternus natator. Keyed using Review of the family Hydrophilidae of Canada and Alaska (Coleoptera) (Smetana, 1988; Great Lakes Entomologist 28 (2), pp. 97-126).
Here you can see the mesosternal keel (see other image also), which is wider than that of the similar T. glaber. Like several other species in the genus, T. natator has a pubescent area on the hind femur reaching from the base to at least the apex of the trochanter. In some species this patch is large, but it is smaller in natator and glaber.
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