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Rio Grande water beetle - Copelatus chevrolati

Rio Grande water beetle - Copelatus chevrolati
Las Cruces, Doña Ana County, New Mexico, USA
December 29, 2005
Size: 6.4 mm
Found four or five of these water beetles hiding mid afternoon under object (rock I think) near small puddle on bed of Rio Grande.

Both banks of the river are in New Mexico at this point, ten or so miles north of the Mexican border, so their nationality is not suspect ;-).

Air temperature was in 60s but lingering cold from the prior night probably made it 20 degrees cooler in their hiding place. They were accompanied by one water beetle of another species.

This image is a composite of five other images combined by Helicon Focus (see discussion and original images).


Maybe same individual in water:

Sure looks like a predaceous diving beetle, family Dytiscidae. Nice detail on this image.

Copelatus I think...
the longitudinal striae on the elytra are diagnostic..and given the size of the specimen (large for this genus), relatively few discal striae (8 or 9 on each side), and locality data it's C. chevrolati- it's reported to be a widespread species in the east and south US and ranges into Mexico.

Thanks, Tim.
Pleased to benefit by your work with the keys.

Thanks Eric.
I wasn't pleased with my attempts to create a montage of the underside. Maybe this evening

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