gracilis, Diapterus Gill [T. N.] 1862:246 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 14; ref. 1665] Cape San Lucas, Baja California, Mexico. No types known. Treated as a nomen protectum by De La Cruz-Agüero 2015:182 [ref. 35419]. •Name is a synonym of Eucinostomus californiensis (Gill 1862) but current usage is accepted, and gracilis is treated as valid under the 2000 Code. •Valid as Eucinostomus gracilis (Gill 1862) -- (Eschmeyer & Herald 1983:216 [ref. 9277], Allen & Robertson 1994:143 [ref. 22193], Bussing & López S. 1994:114 [ref. 23101], Bussing in Fischer et al. 1995:1123 [ref. 22829], De La Cruz Agüero et al. 1997:147 [ref. 24545], Grove & Lavenberg 1997:399 [ref. 24023], Castro-Aguirre et al. 1999:314 [ref. 24550], Chirichigno F. & Vélez D. 1998:347 [ref. 24555], Fuller et al. 1999:400 [ref. 25838], Nelson et al. 2004:143 [ref. 27807], Love et al. 2005:122 [ref. 37547], McCosker & Rosenblatt 2010:192 [ref. 30957], McMahan et al. 2013:450 [ref. 32422], Page et al. 2013:148 [ref. 32708], Barriga Salazar 2014:119 [ref. 35745], De La Cruz-Agüero 2015:182 [ref. 35419], Jiménez-Prado et al. 2015:393 [ref. 34894], Galván-Villa et al. 2016:146 [ref. 34871], Romero-Berny et al. 2018:91 [ref. 35859], Angulo 2021:7 [ref. 38913], Love et al. 2021:161 [ref. 39279], Grove et al. 2022:20 [ref. 41326], Angulo et al. 2023:72 [ref. 40676], Page et al. 2023:173 [ref. 40505]). Current status: Valid as Eucinostomus gracilis (Gill 1862). Gerreidae. Distribution: Eastern Pacific: southern California (U.S.A.) south to Ecuador, including Gulf of California (Mexico) and Galapagos Islands (Ecuador). IUCN (2010): Least Concern. Habitat: freshwater, brackish, marine.