Abundance: 0.12 to 2.76% (median 1.46%)

Latitudinal range: 41.5° to 44.9°

Habitats: (5) only

Found in 5 samples

United States: Holly's Microsite (Late Palaeocene), UMMP SC-4 (Early Eocene), UMMP SC-54 (Early Eocene), UMMP SC-67 (Early Eocene), Big Multi Quarry (Late Palaeocene)

See also Esthonyx ancylion, Esthonyx grangeri, Esthonyx gunnelli, Esthonyx sp., Esthonyx spatularius, Esthonyx xenicus