gracilis, Procatopus (Andreasenius) Clausen [H. S.] 1959:280, Figs. 8-9 [Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening, Kjøbenhavn v. 121; ref. 843] Small stream at Iperin, a few miles north of Ijebu Ode, Ijebu Province, western Nigeria. Holotype: ZMUC P353870 [ex W. Afr. Exped. 802]. Paratypes: BMNH 1962.5.3.14-15 (2); UI (2), West Afr. Exp. 803; ZMB 21408-09 (2, 1); ZMUC P353871 (1, allotype), ZMUC uncat. (35). Type catalog: Nielsen 1974:56 [ref. 9588], Paepke & Seegers 1986:153 [ref. 19981]. •Synonym of Procatopus aberrans Ahl 1927 -- (Wildekamp et al. 1986:194 [ref. 6198], Lévèque et al. 1991:145 [ref. 31367], Romand in Lévêque et al. 1992:618 [ref. 21590], Lazara 2001:259 [ref. 25711]). Current status: Synonym of Procatopus aberrans Ahl 1927. Procatopodidae: Procatopodinae. Habitat: freshwater.