Key to the species of the genus Abyssobrotula

1 a. Pectoral-fin rays 14–15, head large (22.0– 22.5 % SL), opercular spine pointed and strong.......... A. hadropercularis n. sp.

1 b. Pectoral-fin rays 10–11, head small (17.5–19.5 % SL), opercular spine flat and weak........................ A. galatheae