Coelambus nigrolineatus (?)

Coelambus nigrolineatus?

Just like many other Coelambus species this is a pioneer, and thus I found him in a new, shallow pond with water that was well heated by the summer sun. The stripes are not well visible without enlargement. The specification nigrolineatus is not very specific: all Coelambus species have black lines...

This species is not very common (in Holland) and I still have my doubts: could this be the more common impressopunctatus? But then the size is too small. Besides, the wingcases have the punctuation typical of nigrolineatus: large pits in loose lines, between smaller pits that are random spread. The species seems to appear in abundance in new pools. )¹
A month later there was more vegetation the the pond, I didn't see the beetles anymore.

)¹ De waterkevers van Nederland 1992 - (van Nieukerken a.o.) published by KNNV (Dutch)

Below a detail picture of a wingcase. The larger pits in loose lines between the random smaller ones are visible.

Clicking on the picture at left links to a page on another specimen, that has interrupted lines.

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