Genus: Peralestes OWEN, 1871
Etymology: Greek, pera, “pouch”, Greek, lestes, “thief”: Pouched thief.

Species: longirostris OWEN, 1871
Etymology:

Holotype: BMNH 47740

Locality: Durdlestone Bay, Swanage, Dorset County, England, Southern United Kingdom.

Horizon: Purbeckian.

Biostratigraphy:

Age: Tithonian Stage, Upper Malm Epoch, Late Jurassic.

Material: Part of right upper jaw with last premolar and all the molars and part of the jaw anterior of these teeth.