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Photo#1525838
? - Hydaticus bimarginatus

? - Hydaticus bimarginatus
Tallahassee, Leon County, Florida, USA
May 27, 2018
12 n in the (water-filled) back of my truck. There were several but quite successful hiding under plant debris. Perhaps something close to Dytiscus?

Images of this individual: tag all
? - Hydaticus bimarginatus ? - Hydaticus bimarginatus

thanks for the correction!

Hydaticus
I would expect this to be H. bimarginatus. The solid black coloration isn't really found in H. cinctipennis and some of the minute details are more common of H. bimarginatus. Plus H. cinctipennis is rare in Florida (only two records), while H. bimarginatus is very common.

cool, uncommon, and distinctive -- thanks
Moved from Beetles.

Most likely Cybister fimbriolatus
However, the angle makes it nearly impossible to be sure. I don't suppose you have a straight-on dorsal shot?

 
added a 2nd photo
unfortunately it's very fuzzy.

Predaceous diving beetle - Dytiscidae
You have the family right, for sure.

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