eustalus, Melanocetus Pietsch [T. W.] & Van Duzer [J. P.] 1980:79, Fig. 28 [United States National Marine Fisheries Service Fishery Bulletin v. 78 (no. 1); ref. 5333] Eastern Pacific, off Mazatlán, Mexico, 21°39'N, 106°58'W, depth 0-1675 meters. Holotype (unique): LACM 30037-12. •Valid as Melanocetus eustalus Pietsch & Van Duzer 1980 -- (Pietsch 2009:366 [ref. 30766], Page et al. 2023:165 [ref. 40505], Fricke et al. 2024:673 [ref. 41622]). Current status: Valid as Melanocetus eustalus Pietsch & Van Duzer 1980. Melanocetidae. Distribution: Eastern Pacific: southern Sinaloa south to Guerrero (Mexico); Clipperton Island (France). IUCN (2019): Data Deficient. Habitat: marine.