Found in 3 samples

United States: UMMP SC-4 (Early Eocene), UMMP SC-54 (Early Eocene), UMMP SC-67 (Early Eocene)

See also Esthonyx, Esthonyx acutidens, Esthonyx ancylion, Esthonyx bisulcatus, Esthonyx grangeri, Esthonyx gunnelli, Esthonyx sp.