 Described on the basis of a single mandible (lower jaw) with the first molar missing and an isolated upper incisor, both of uncertain but Quaternary age, it is one of the smaller members of the genus "Megalomys".Little is known about the animal, and its provenance and distinction from ""Ekbletomys hypenemus"", an even larger extinct oryzomyine that also occurred on Barbuda, have been called into question.The toothrow in the lower jaw has a length of 8.7 mm at the alveoli.