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Taxonomy

Geography

Data last updated
Mon 1 Dec 2025

species Utterbackia imbecillis (Say, 1829): specimens

Recent Taxonomic Opinions

Utterbackia imbecillis — Graf & Cummings (2007), Zanatta et al. (2007), Tiemann et al. (2007), Williams et al. (2008), Anonymous (2008), ... Chen et al. (2025), FMCS (2025), Cummings et al. (2025), Hou et al. (2025), Wang et al. (2025)
Anodonta imbecillis — ITIS (2012)
U. imbecillis — Marshall et al. (2018)

Widespread in the Interior, Great Lakes, Gulf Coastal, and Atlantic slope basins, North America. Introduced to peninsular Florida and Mexico.

specimens map of Utterbackia imbecillis

AMS_102107 canal, 20.5 mi WNW Anahuac, Nuevo Leon, Mexico	USNM_7078 Esteros d’eau douce. Matamoras.	UF_41350 lake in the middele of a pasture, 1.6 mi SW Agualeguas, Nuevo Leon, Mexico
UF_41351 lake in the middele of a pasture, 1.6 mi SW Agualeguas, Nuevo Leon, Mexico	USNM_25975 Matamoras, Mexico	USNM_86692 Matamoras, Mexico
USNM_86692B Matamoras, Mexico	USNM_1282735 Mexico: Coahuila. Rio Salado de Nadadores, 0.5 mi S Progresso on road to HW 57 [distance from HW 57 is 14.6 mi]	USNM_903964 Rio Conchos, Saucillo, downstream from large cobble riffles, Chihuahua, Mexico
USNM_1282737 Tamaulipas, Rio Carrizal at Rt. Mex. 180 in Nuevo Progreso, ca. 20.8 mi N of road divergence (on Rt. Mex. 180) to Aldma and Est. Manuel	USNM_1282739 Veracruz, Rio Papaloapan off road from Ciudad Aleman to Tuxtepec; ca. 0.5 roadmiles by dirt road to river; dirt road entrance to Aleman-Tuxtepec road is ca. 2.4 roadmiles W of divergence of roads to Ciudad Aleman and Cosamaloapan

SMF_4301
N. Amerika

TMYERS_001 Bill Williams River, Bill Williams River National Wildlife Refuge, S of Cattail Marsh Near Lake Havasu, La Paz Co., Arizona, USA	USNM_892027 Bill Williams River, Bill Williams River National Wildlife Refuge, S of Cattail Marsh Near Lake Havasu, Mohave Co., Arizona, USA	USNM_892027 Bill Williams River, Bill Williams River National Wildlife Refuge, S of Cattail Marsh Near Lake Havasu, Mohave Co., Arizona, USA
USNM_678301 Comanche Creek, [trib. of Pecos R., Pecos Co.], Texas	BMNH_196465 Comanche Creek, Texas	TMYERS_007 Lake Havasu, at Lake Havasu City, in a small cove off peninnsula into the Colorado River, Mohave Co., Arizona
TMYERS_007 Lake Havasu, at Lake Havasu City, in a small cove off peninnsula into the Colorado River, Mohave Co., Arizona	USNM_25606 Ohio	UMMZ_209141 Sturgeon Bay, Wisc.