Dytiscidae, Hydroporini - Clarkhydrus decemsignatus

Moved

… v belov, 23 May, 2015 - 10:32am

Wrong genus

There is definitely an S. decemsignatus. No records of Oreodytes from TX.

… Tim Loh, 22 May, 2015 - 11:14pm

Yes- Stictotarsus!

Correct - decimsignatus is currently placed in Stictotarsus. Had a brain fade when I called it an Oreodytes. The species was keyed in Zimmerman & Smith (1975) and described as a new species, Deronectes yaquii. Zimmerman (1982) realized the synonymy and called it D. decimsignatus (originally described by Clark (1862) as a Hydroporus). Ten years after Jim's 1982 work, Nilsson and Angus (1992) reclassified the group of genera "around" Deronectes and placed decimsignatus in Stictotarsus. I KNEW that, but managed to stupidly write Oreodytes instead of Stictotarsus! :-) The species ranges south to at least Oaxaca in Mexico and north into Arizona (and Texas!), and is quite variable in coloration. It was missed by Larson & Roughley (2000).

… J. H. Epler, 23 May, 2015 - 9:12am

Wow!

Nice dyt! This species is not included in the key by Larson and Alarie...wondering whether it normally occurs further south..

… Tim Loh, 22 May, 2015 - 11:08pm

thanks all

Moved from Predaceous Diving Beetles.

… v belov, 28 February, 2015 - 8:51am

Might be Oreodytes decimsignatus

Can't be sure without the beetle in hand and view of male genitalia; O. decimsignatus is quite variable in coloration. Note that "Coelambus" is currently considered a subgenus of Hygrotus but may soon be re-split.

… J. H. Epler, 28 February, 2015 - 8:32am

Moved..adorable! Wish I knew the aquatics better!

something akin to Desmopachria? Although 4 mm is a bit big for Desmopachria, I believe.

Moved from ID Request.

… Blaine Mathison, 25 February, 2015 - 1:14pm

adorable indeed... could it be an Oreodytes?

i'm also in unfamiliar waters here

… v belov, 27 February, 2015 - 8:34pm

Maybe Heterosternuta?

Ziser's aquatic inverts of Texas page lists only H. diversicornis, which is probably the most similar-looking species I've seen so far. I suppose I should've collected it and gone through a taxonomic key.

… Robert Deans, 27 February, 2015 - 10:35pm