Danube delta gudgeon

The Danube delta gudgeon, Romanogobio antipai, is a small freshwater ray-finned fish in the family Gobionidae, the gudgeons. It is endemic to the lower Danube, where it has been recorded in Bulgaria, Romania and Ukraine. The species has an unusually troubled record: it was last recorded in the 1960s, and many surveys across its home range over the following decades failed to find it, until a specimen was collected from the Bulgarian sector of the Danube in 2016. Its scientific name honours the Romanian zoologist Grigore Antipa (1867 to 1944), who collected the type specimen.