First Record of Ernogrammus zhirmunskii (Actinopterygii: Cottiformes: Stichaeidae) from Japan, with a Description and a Revised Diagnosis

Sixteen specimens of Ernogrammus zhirmunskii Markevich and Kharin, 2011, formerly known only from Peter the Great Bay, Russia, were collected from Volcano Bay on the Pacific coast of Hokkaido and from Shizugawa Bay, Miyagi Prefecture, Pacific coast of the northern Honshu, Japan. This species is redescribed on the basis of these specimens and several errors in the original description are corrected. This species is easily distinguished from other stichaeid fishes in having a diagnostic lateral-line pattern and a rigid spine in the posteriormost part of the anal fin.