acutecaudatum, Melanonosoma Gilchrist [J. D. F.] 1902:106 [Marine Investigations in South Africa v. 2; ref. 1644] Off Cape Peninsula, Cape Point Light House, bearing S83°E, distance 35.5 miles, South Africa, depth 360 fathoms. Holotype (unique): SAM (apparently lost). •Synonym of Melanonus gracilis Günther 1878 -- (Cohen 1986:329 [ref. 5646], Cohen 1990:540 [ref. 15766]). Current status: Synonym of Melanonus gracilis Günther 1878. Melanonidae. Habitat: marine.