Monochirus Kaup [J. J.] 1858:101 Masc. Monochirus maculipinnis Kaup 1858. Type by monotypy. As "Monochirus Agass. nec. Cuv.", with description provided. Can be regarded as a new genus, dating to Kaup. Objectively invalid; preoccupied by Monochirus Rafinesque 1814 and Monochirus Oken 1817 in fishes. 1°Homonym. Current status: Uncertain. Soleidae.