Page last updated
Thu 3 September 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 | Unionida | Unionoidea | Unionidae | Ambleminae | Lampsilini | Truncilla

species Truncilla cognata (Lea, 1860): specimens
     1 available nominal species synonym (2 total synonyms)

Recent Taxonomic Opinions

Truncilla cognata — Graf & Cummings (2007), Bogan (2010), ITIS (2012), Williams et al. (2017), Burlakova et al. (2019), ... Hopper et al. (2023), Saxon et al. (2023), FMCS (2025), Cummings et al. (2025), Campbell & Lydeard (2026)
Truncilla cognatus — Haag (2012)

Range

Rio Grande basin,Texas and Mexico.

Map of Georeferenced Specimens

Mexico

USNM_252105. Mexico, Tamaulipas, Salado River near Nuevo Laredo

USA

Georeferenced Genbank Vouchers

USA

JBFMC_8266-1 (Tcog_RG06). (COI: MZ726616, go to Genbank) Rio Grande R., La Bota Ranch, Webb Co., Texas.

JBFMC_8383-1 (Tcog_RG07). (COI: MZ726617, go to Genbank) Rio Grande R., upstream of La Bota, Webb Co., Texas.

JBFMC_8383-10 (Tcog_RG16). (COI: MZ726622, go to Genbank) ditto.

JBFMC_8383-11 (Tcog_RG17). (COI: MZ726623, go to Genbank) ditto.

JBFMC_8383-12 (Tcog_RG18). (COI: MZ726624, go to Genbank) ditto.

JBFMC_8383-13 (Tcog_RG19). (COI: MZ726625, go to Genbank) ditto.

JBFMC_8383-14 (Tcog_RG20). (COI: MZ726626, go to Genbank) ditto.

JBFMC_8383-15 (Tcog_RG21). (COI: MZ726627, go to Genbank) ditto.

JBFMC_8383-17 (Tcog_RG23). (COI: MZ726628, go to Genbank) ditto.

JBFMC_8383-19 (Tcog_RG25). (COI: MZ726629, go to Genbank) ditto.

JBFMC_8383-3 (Tcog_RG09). (COI: MZ726618, go to Genbank) ditto.

JBFMC_8383-5 (Tcog_RG11). (COI: MZ726619, go to Genbank) ditto.

JBFMC_8383-6 (Tcog_RG12). (COI: MZ726620, go to Genbank) ditto.

JBFMC_8383-8 (Tcog_RG14). (COI: MZ726621, go to Genbank) ditto.

JBFMC_8238-1 (Tcog_RG01). (COI: MZ726611, go to Genbank) Rio Grande R., Webb Co., Texas.

JBFMC_8238-2 (Tcog_RG02). (COI: MZ726612, go to Genbank) ditto.

JBFMC_8238-3 (Tcog_RG03). (COI: MZ726613, go to Genbank) ditto.

JBFMC_8238-4 (Tcog_RG04). (COI: MZ726614, go to Genbank) ditto.

JBFMC_8238-5 (Tcog_RG05). (COI: MZ726615, go to Genbank) ditto.

UF_438552-6496. (28S: MK036138, COI: MK044969, ITS1, 5.8S: MK036220, ND1: MK045120, go to Genbank) Rio Grande, Rio Grande drainage (27.6377, -99.627).

UF_438552-6502. (28S: MK036139, COI: MK044970, ITS1, 5.8S: MK036221, ND1: MK045121, go to Genbank) ditto.

UF_438552. (SRA: SRX7259528, go to Genbank) USA, Texas, Webb County, Rio Grande (site 2), about 300 m upstream of Santa Isabel Creek (27.63774, -99.62695).

JBFMC_8383_19. (16S: PQ238852, go to Genbank) USA: Texas, Rio Grande.