It is known from early Miocene Burdigalian stage Dominican amber deposits on the island of Hispaniola.

[1][2] The species is known from a single 8.8 millimetres (0.35 in) male specimen excavated from the La Toca mine group northeast of Santiago de los Caballeros in 2008 and deposited in the Insect Fossil Collection at the University of Kansas Natural History Museum in Lawrence, Kansas, where it was studied and described by Dr. Michael S.

[1] Despite the large quantities of amber examined from the Dominican Republic, no additional specimens of Leptofoenus pittfieldae have been found.

[1] L. pittfieldae is placed within Leptofoenus because it has a striolate region on the side of the pronotum, a feature found in the living species.

The metatibia of L. pittfieldae lacks the rasp-like structure found in modern species.