Genus: Bentonyx LANGER, MONTEFELTRO, HONE, WHATLEY & SCHULTZ,
2010 (published in 2011)
Etymology: In honor of the British Palaeontologist, and 'rhynchosaur champion' Michael Benton, and Greek, onyx, "claw" commonly applied to rhynchosaurs.
Species: sidensis LANGER, MONTEFELTRO, HONE, WHATLEY & SCHULTZ,
Etymology: In refernece ot the Sid River, East Devon County, England, near the outfall of which the holotype was collected.
Holotype: BRSUG 27200
Locality: Pennington Point, 20 m west of the Sid River outfall, about 3 km west of the cliffs near Peak Hill, East Devon County, England, Southern United Kingdom.
Horizon: Otter Sandstone Formation.
Age: Late Anisian Stage, Lower Mid Triassic epoch, Middle Triassic.
Material: A nearly complete skull, lacking the lower part of the temporal areas and the caudolateral corners and partial mandible lacking most of the post-dentary bones.