Abundance: 0.01 to 36.46% (median 0.45%)

Latitudinal range: 27.0° to 44.3°

Habitats: (17) only

Found in 17 samples

Canada: Keffer (Midden 57, screened), Keffer (Midden 57, floated), Spillsbury Bay

Mexico: El Zurdo

Spain: Cueva de Nerja (Tardiglacial), Cueva de Nerja (Early Holocene), Bolomor Cave (Level XI), Bolomor Cave (Level IV)

United States: North Creek Shelter (Paleoarchaic), Hulme Site, Fort Center Mound A, Coffey (Horizon III-5, KSU), Coffey (Horizon III-5, 1972-73), Jones, Schuiling Cave, Sunshine Locality (Unit C), Sunshine Locality (Unit E)

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