opercularis, Myxodagnus Gill [T. N.] 1861:270 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 13; ref. 1778] Cape San Lucas, Baja California, Mexico. Lectotype: USNM 2531. Paralectotypes: USNM 2532-33 (1, 1). Type catalog: Springer & Orrell 1996:14 [ref. 22274]. Lectotype selected by Dawson 1976:36 [ref. 7376]. •Valid as Myxodagnus opercularis Gill 1861 -- (Dawson 1976:33 [ref. 7376], De La Cruz Agüero et al. 1997:120 [ref. 24545], Grove & Lavenberg 1997:521 [ref. 24023], Nelson et al. 2004:162 [ref. 27807], Love et al. 2005:153 [ref. 37547], Patzner et al. 2009:472 [ref. 30396], Hastings & Springer 2009:9 [ref. 31156], Page et al. 2013:167 [ref. 32708], Fourriére et al. 2016:449 [ref. 34668], Del Moral-Flores et al. 2016:610 [ref. 34923], Love et al. 2021:195 [ref. 39279], Page et al. 2023:158 [ref. 40505]). Current status: Valid as Myxodagnus opercularis Gill 1861. Dactyloscopidae. Distribution: Eastern Pacific: Pacific coast of southern Baja California Sur (Mxico) south to Costa Rica, including Gulf of California (Mexico) and Revillagigedo Islands (Mexico). Habitat: marine.