Mesocottus haitej

The Amur sculpin Mesocottus haitej is a species of freshwater sculpin native to eastern Asia where it is found in Russia, China and Mongolia - in the Amur River basin and some adjacent territories (the Tugur and the Uda Rivers flowing into the Sea of Okhotsk north from the Amur River, north-west of Sakhalin Island opposite the mouth of the Amur River). The Amur sculpin grows to a length of 20 centimetres (7.9 in) TL. This species is the only known member of its genus. According to the result of a pilot phylogenetic analysis, the freshwater Mesocottus is a sister lineage to the Cottus clade.