species Utterbackia imbecillis (Say, 1829): specimens

6 available nominal species synonyms (11 total synonyms)

Recent Taxonomic Opinions

Utterbackia imbecillis — Graf & Cummings (2007), Zanatta et al. (2007), Tiemann et al. (2007), Williams et al. (2008), Anonymous (2008), ... Hou et al. (2025), Wang et al. (2025), Campbell & Lydeard (2026), Wu et al. (2026), Wu et al. (2026)
Anodonta imbecillis — ITIS (2012)
U. imbecillis — Marshall et al. (2018)

Range

Widespread in the Interior, Great Lakes, Gulf Coastal, and Atlantic slope basins, North America. Introduced to peninsular Florida and Mexico. (North America: NA2 NA3 NA4 Central America: CA1)

Map of Georeferenced Specimens

specimens map of Utterbackia imbecillis

MUSSELp Specimen Records

Type Specimens

USNM_678301
Comanche Creek, [trib. of Pecos R., Pecos Co.], Texas
paralectotype
Anodon horda Gould, 1855

USNM_86692
Matamoras, Mexico
lectotype
Anodonta henryana Lea, 1857

SMF_4301
N. Amerika
type
Anodonta imbecillis Say, 1829

UMMZ_209141
Sturgeon Bay, Wisc.
holotype
Utterbackia fusca F.C. Baker, 1927

BMNH_196465
Comanche Creek, Texas
lectotype
Anodon horda Gould, 1855

USNM_86692B
Matamoras, Mexico
paralectotypes
Anodonta henryana Lea, 1857

Other Specimens by Country | show by collection

9 Specimens from Mexico

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_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