[Peter Finke]

Ted, the new form is probably not a hybrid. We shall see soon; the first larvae swim in Germany. It maybe a subspecies of filamentosus, but even then it must ke kept apart!
But I share your fears. So, we should not name it cf. filamentosus but spec. Ampah. Sure, they must be kept apart!! And you are right: it is rather difficult with females. The dealers may not keep them together with filamentosus!