improvisus, Carcharinus Smith [J. L. B.] 1952:761, Fig. 1 [Annals and Magazine of Natural History (Series 12) v. 5 (no. 56) (art. 78); ref. 12804] Algoa Bay, South Africa, western Indian Ocean. Holotype (unique): SAIAB [formerly RUSI] (not found in 1996). Original genus should have been Carcharhinus. •Synonym of Carcharhinus brachyurus (Günther 1870) -- (Garrick 1982:171 [ref. 5454], Compagno 1984:464 [ref. 6846], Bass et al. 1986:71 [ref. 5638], Springer 1990:103 [ref. 19320], Castro 2011:403 [ref. 31457], Dyldin 2015:53 [ref. 34524]). Current status: Synonym of Carcharhinus brachyurus (Günther 1870). Carcharhinidae. Habitat: brackish, marine.