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Page last updated
Thu 17 July 2025

The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves)

FM(U)otW(aolcb) is the web version of the MUSSEL Project Database. Follow the links to browse the data or use the custom Google search field. Either way, you win!


Bivalvia | ... | Unioninae | Anodontini | Alasmidontina | Utterbackia

species Utterbackia imbecillis (Say, 1829): specimens
     6 available nominal species synonyms (11 total synonyms)

Recent Taxonomic Opinions

Utterbackia imbecillisGraf & Cummings (2007), Zanatta et al. (2007), Tiemann et al. (2007), Williams et al. (2008), Anonymous (2008), ... Dai et al. (2024), Wu et al. (2024), Wu et al. (2024), Hou et al. (2024), Dai et al. (2025)
Anodonta imbecillisITIS (2012)
U. imbecillisMarshall et al. (2018)

Range

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

Map of Georeferenced Specimens

species map


Mexico

specimen
AMS_102107

canal, 20.5 mi WNW Anahuac, Nuevo Leon, Mexico

specimen
USNM_7078

Esteros d’eau douce. Matamoras.

specimen
UF_41350

lake in the middele of a pasture, 1.6 mi SW Agualeguas, Nuevo Leon, Mexico

specimen
UF_41351

lake in the middele of a pasture, 1.6 mi SW Agualeguas, Nuevo Leon, Mexico

specimen
USNM_25975

Matamoras, Mexico

specimen
USNM_86692

Matamoras, Mexico

specimen
USNM_86692B

Matamoras, Mexico

specimen
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]

specimen
USNM_903964

Rio Conchos, Saucillo, downstream from large cobble riffles, Chihuahua, Mexico

specimen
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

specimen
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


unknown

specimen
SMF_4301

N. Amerika


USA

specimen
TMYERS_001

Bill Williams River, Bill Williams River National Wildlife Refuge, S of Cattail Marsh Near Lake Havasu, La Paz Co., Arizona, USA

specimen
USNM_892027

Bill Williams River, Bill Williams River National Wildlife Refuge, S of Cattail Marsh Near Lake Havasu, Mohave Co., Arizona, USA

specimen
USNM_892027

Bill Williams River, Bill Williams River National Wildlife Refuge, S of Cattail Marsh Near Lake Havasu, Mohave Co., Arizona, USA

specimen
USNM_678301

Comanche Creek, [trib. of Pecos R., Pecos Co.], Texas

specimen
BMNH_196465

Comanche Creek, Texas

specimen
TMYERS_007

Lake Havasu, at Lake Havasu City, in a small cove off peninnsula into the Colorado River, Mohave Co., Arizona

specimen
TMYERS_007

Lake Havasu, at Lake Havasu City, in a small cove off peninnsula into the Colorado River, Mohave Co., Arizona

specimen
USNM_25606

Ohio

specimen
UMMZ_209141

Sturgeon Bay, Wisc.

TMYERS_0000. Mittry Lake, Yuma Co., Arizona, USA

Georeferenced Genbank Vouchers


USA

UF_439469. (16S) USA: Texas, Brazos River