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Photo#1139094
Mesovelia mulsanti

Mesovelia mulsanti
Cedar Park, Williamson County, Texas, USA
September 13, 2015
Size: TL 3+ mm
These green apterous water treaders were abundant on Lake Creek in southern Williamson Co., TX. Although not measured in the field, knowing the capabilities of my point-and-shoot camera allows me to estimate that most/all of them were 3 to 4 mm long. Of three N. Am. species of Mesovelia (M. cryptophila, amoena, and mulsanti), only the latter two have been recorded in Texas and amoena only in s.e. coastal Texas (Jackson Co.)(discoverlife.org). Moreover, a paper by Kort-Gommers and Nieser* suggests that the latter two species can be separated by size, amoena being only 2.1-2.3 mm long and mulsanti ranging from 3.0 to 3.8 mm. I saw a few winged adults but did not get any clear pictures of them--they are extremely fast movers on the water and algal surfaces! I'll upload images of three (presumed) different individuals from the sharpest images I obtained.

* Kort-Gommers and Nieser. 1969. Records of Antillean Water-Striders (Heteroptera). Pp. 75-77, In: Studies on the fauna of Curacao and other Caribbean Islands, No. 112.