nigricans, Gobius fluviatilis var. Canestrini [G.] 1867:11 [Annuario della Società dei naturalisti in Modena v. 2; ref. 22385] Arno River, Italy. Syntypes: MUSNM PO-205/92 (4). Type catalog: Nocita & Vanni 2001:1767 [ref. 36142]. •Valid as Neogobius nigricans (Canestrini 1867) -- (Geiger et al. 2014:Table S2 [ref. 37408]). •Valid as Padogobius nigricans (Canestrini 1867) -- (Bianco & Miller 1990:1289 [ref. 16709], Kottelat 1997:179 [ref. 22952], Nocita & Vanni 2001:1767 [ref. 36142], Miller in Miller 2004:56 [ref. 27853], Huyse et al. 2004:327 [ref. 27956], Kottelat & Freyhof 2007:585 [ref. 29996], Freyhof 2011:285 [ref. 31742], Bianco & Delmastro 2011:6 [ref. 31648], Bianco 2013:9 [ref. 32897], Lorenzoni et al. 2019:253 [ref. 37108]). Current status: Valid as Padogobius nigricans (Canestrini 1867). Gobiidae: Gobiinae. Distribution: Southern Europe: Italy endemic. Habitat: freshwater.