Lasiognathus dinema is a species of marine ray-finned fish belonging to the family Thaumatichthyidae, the wolftrap anglers. This species is known only from the northern Gulf of Mexico.
Lasiognathus dinema was first formally described in 2015 by Theodore Wells Pietsch III and Tracey T. Sutton with its type locality given as the northern Gulf of Mexico at 27.5°N, 88.5°W from a depth between, where the seabed was at . This species belongs to the genus Lasiognathus which the 5th edition of Fishes of the World classifies within the family Thaumatichthyidae, within the suborder Ceratioidei of the anglerfish order Lophiiformes.[1]
Lasiognathus dinema is a member of the genus Lasiognathus, this name is a combination of lasios, meaning "bearded", and gnathus, which means "jaw". This may be a reference to the many long teeth in the upper jaw, goving the appearance of a beard. The specific name, dinema, means "two threads", an allusion to te two elongated filaments that emerge from the bases of the hooks on the escal bulb.[2]
Lasiognathus dinema is distinguished from its congeners by the morphology of the esca. This species has an esca which has a cylindrical front appendage with internal pigmentation and a pair of elongated appendages at the tip of the esca.[3] This species has a maximum published standard length of .
Lasiognathus dinema is known from a single location in the northern Gulf of Mexico within a radius of of the Macondo wellhead where it has been collected from depths between .
Lasiognathus dinema is known from only three specimens are known, all collected in 2011. The type locality is close to the location of the Deepwater Horizon oil spill and the population, range and biology of this species are little know, leading the International Union for Conservation of Nature to classift this species as Data deficient.