acutipinnis, Cotylopus Guichenot [A.] 1863:C-10 [Faune ichthyologique 2nd Partie, Annexe C.; ref. 1943] Réunion, western Mascarenes, southwestern Indian Ocean. Holotype (unique): MNHN 0000-1321. Type catalog: Bauchot et al. 1991:21 [ref. 19958]. •Valid as Cotylopus acutipinnis Guichenot 1863 -- (Maugé 1986:366 [ref. 6218], Watson 1995:65 [ref. 22316], Fricke 1999:506 [ref. 24106], Keith et al. 1999:118 [ref. 24548], Sparks & Nelson 2004:4 [ref. 27700], Keith et al. 2005:1396 [ref. 28139], Fricke et al. 2009:100 [ref. 30213], Keith et al. 2015:34 [ref. 34328], Arndt & Fricke 2019:16 [ref. 36883], Parenti 2021:410 [ref. 38603], Larson 2022:177 [ref. 39971], Fricke et al. 2024:73 [ref. 41255]). Current status: Valid as Cotylopus acutipinnis Guichenot 1863. Oxudercidae: Sicydiinae. Distribution: Southwestern Indian Ocean: western Mascarenes (La Réunion and Mauritius) endemic [amphidromous]. Habitat: freshwater, brackish, marine.