New Species of the Ceratioid Anglerfish Genus Lasiognathus Regan (Lophiiformes: Thaumatichthyidae) from the Eastern North Atlantic off Madeira
A new species of the deep-sea ceratioid anglerfish genus Lasiognathus Regan (family Thaumatichthyidae) is described from a single female specimen collected in the eastern north Atlantic Ocean off Madeira. It is most similar to Lasiognathus saccostoma Regan but differs from this species and from its remaining congeners, Lasiognathus beebei Regan and Trewavas, Lasiognathus waltoni Nolan and Rosenblatt, and Lasiognathus intermedius Bertelsen and Pietsch, in having only two bony hooks in the esca. The new species is diagnosed and described, and a revised key to the species is provided.Abstract
Lasiognathus amphirhamphus n. sp., holotype, BMNH 2003.11.16.12, female, 157 mm.
Esca of Lasiognathus amphirhamphus n. sp., holotype, BMNH 2003.11.16.12, female, 157 mm, left lateral view (prolongation of distal escal appendage rotated to show posterior face)
Escae of Lasiognathus saccostoma: (A) ISH 5541/79, 30 mm, left lateral view; (B) MMF 19019, holotype of Lasiognathus ancistrophorus, 55.5 mm, left lateral view (after Maul, 1962:fig. 5B); (C) SIO 79–345, 77 mm, left lateral view (distal appendage twisted in preservation so that escal hooks are incorrectly directed anteriorly); (D) SIO 79–345, 77 mm, detail of escal hooks, posterior view
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School of Aquatic and Fishery Sciences, College of Ocean and Fishery Sciences, University of Washington, Box 355020, Seattle, Washington 98195–5020. twp@u.washington.edu