Eumicrotremus derjugini, also known as the leatherfin lumpsucker or petite poule de mer Arctique[1] (meaning "small Arctic sea hen" in French), is a species of lumpfish native to the Arctic, the North Atlantic, and the North Pacific.

It occurs at a depth range of 5 to 1038 m (16 to 3406 ft), and it reaches 10 cm (3.9 inches) SL.

It is a benthic species often found on substrates of mud, gravel, or stone at temperatures below 0 °C, feeding mainly on crustaceans and Oikopleura.

The young of this species are reportedly seen in shallower water.

[2] The species name commemorates the collector Konstantin Deryugin.