Cymbiodyta marginella

When I found this beetle I thought it might be a dark Enochrus species. But the book cleared the puzzle (van Nieukerken, 1992, 182-183 and 218-219). The Cymbiodyta genus has 4-membered tarsi (feet) on the middle and hind legs, because the basal segments are fused. Enochrus has 5-segmented tarsi. The photos below show the hind leg and middle leg of this beetle, the rightmost is the middle leg of an Enochrus species.

Cymbiodyta marginella, middel leg 08-10-2008

Enochrus quadripunctatus, middle leg 01-06-2008

Later I found further confirmation for the determination in Forster&Friday (2014, 16-17 and 51-52). They give as an additional characteristic: the inwardly curved first visible segment of the maxillary palps, in Enochrus this is outwardly curved.

Below are some more photos of the same specimen. Note the characteristic brown edges of the pronotum. The underside of the beetle is black.

Literature: See the Waterbeetles bibliography.

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