Type locality, Fernandina Island, Punta Espinosa, CAS 86428 (holotype of Eptatretus grouseri, 37.8 cm TL) (Ref. 75169); also collected off northeastern Seymour I. (Ref. 123790). Collected in Bolivar Channel, off Cabo Douglas (Ref. 31788). Also Ref. 55621.