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Lithoeciscus has been split off by Bezzi > L. heydenii. Used to be Holopogon. Bezzi also noticed that some other species were very close, like H. rugiventris, and even Cyrtopogon tenuibarbis a.o. In Spain a lot of such specimens have been collected and most seem to be very close. One of the remarkable differences with the "regular" Holopogon species is that the hind tibiae and metatarsi are not so swollen. We are studying a lot of them but we still have to compare them with type material. This may take a lot of time.

But I think Piluca is very close, I would say Lithoeciscus (Holopogon) cf heydenii too

Ramon, did you collect any of these specimens? Do you have more pictures?