Thread subject: Diptera.info :: Ephydrid from Potamogeton leaf mine

Posted by John Bratton on 08-12-2021 15:37
#1

25 March 2021 I collected some Potamogeton polygonifolius with mined leaves. Three ephydrids (I think) emerged in May, two females and a male. Here is the male.

The site is a shallow weedy pond at Moelyci Farm, Tregarth, North Wales.

Martin Drake's unpublished key mentions two species associated with Potamogeton: Hydrellia flavicornis and H. fulviceps. The genitalia of this fly are somewhat like those of H. flavicornis. But the fly doesn't key to Hydrellia- the lunule doesn't extend up to near the ocelli. And H. flavicornis is supposed to have yellow antennae and no strong presutural dorso-central.

So, does anyone recognise it, please?