alphus, Hydrolagus Quaranta [K. L.], Didier [D. A.], Long [D. J.] & Ebert [D. A.] 2006:36, Figs. 2-3 [Zootaxa No. 1377; ref. 28889] North end of Seymour Island, 0°21'42"S, 90°15'00"W, Galápagos Islands, depth 648 meters. Holotype: CAS 201902. Paratypes: CAS 86425 (1). Additional specimen seen but not collected. •Valid as Hydrolagus alphus Quaranta, Didier, Long & Ebert 2006 -- (James et al. 2009:65 [ref. 30401], McCosker & Rosenblatt 2010:187 [ref. 30957], Weigmann 2016:166 [ref. 34211], Walovich et al. 2017:516 [ref. 35113], Jew et al. 2018:[3] [ref. 36022], Calle-Morán et al. 2020:248 [ref. 37881], Grove et al. 2022:15 [ref. 41326], Séret & Quod 2023:3 [ref. 40565]). Current status: Valid as Hydrolagus alphus Quaranta, Didier, Long & Ebert 2006. Chimaeridae. Distribution: Eastern Pacific: Galapagos Islands (Ecuador) endemic. IUCN (2020): Least Concern. Habitat: marine.