Abundance: 0.00 to 36.46% (median 3.01%)

Latitudinal range: 27.0° to 39.7°

Habitats: (10) only

Found in 10 samples

Mexico: El Zurdo (Holocene)

Spain: Cueva de Nerja (Tardiglacial) (Late Pleistocene), Bolomor Cave (Level XI) (Middle Pleistocene), Bolomor Cave (Level IV) (Middle Pleistocene)

United States: Fort Center Mound A (Holocene), Coffey (Horizon III-5, KSU) (Holocene), Coffey (Horizon III-5, 1972-73) (Holocene), Jones (Late Pleistocene), Sunshine Locality (Unit C) (Holocene), Sunshine Locality (Unit E) (Late Pleistocene)

See also Aythya, Aythya affinis, Aythya americana, Aythya collaris, Aythya ferina, Aythya marila, Aythya nyroca, Aythya spp.