| Page last updatedWed 1 October 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! 
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 Bivalvia | Unionoida | Unionoidea | Unionidae | Ambleminae | Lampsilini | Actinonaias species Actinonaias coyensis (Pilsbry, 1910): specimens1 available nominal species synonym (2 total synonyms)
 Recent Taxonomic OpinionsActinonaias coyensis — Graf & Cummings (2007), Bogan (2010), Bogan (2013), Graf & Cummings (2021), Czaja et al. (2023), Cummings et al. (2025) RangeEndemic to the Pánuco basin in San Luis Potosí and Tamaulipas, México. Map of Georeferenced Specimens
 Mexico|  FMNH_68098
 Coy River, Mexico
 |  UF_65413
 Coy River, Mexico
 |  ANSP_99522
 Coy River, S.L. Potosi, Mex.
 |  |  INHS_15231
 Coy River, San Luis Potosi, Mexico
 |  INHS_21726
 Coy River, San Luis Potosi, Mexico
 |  UF_270357
 Coy River, San Luis Potosi, Mexico
 |  |  UF_93179
 Ganina River, 3 mi SW San Dieguito, Mexico
 |  USNM_1282547
 Mexico, San Luis Potosi, small stream crossed by Fed. Hwy. 85, 4.2 mi S of Valles south city limits and ca. 2 mi N of Covadonga Hotel
 |  USNM_1282546
 Mexico, San Luis Potosí, stream 0.2 mi West of Tamuin, where crossed by Mex. Fed. Hwy. 70
 |  |  UF_270355
 pond near Valles River, Valles, San Luis Potosi, Mexico
 |  INHS_21762
 Rio Casas Viejas, N of Valles, San Luis Potosi, Mexico
 |  AMS_102119
 Rio Guayalejo, ENE Ciudad Monte, Tamaulipas, Mexico
 |  |  INHS_21763
 Rio Moctezuma, S of Tampamolon, San Luis Potosi, Mexico
 |  USNM_1282268
 Rio Tamuin [Tampaón], at Mex. 85 just S of Alvero Obregon, S of Ciudad Valles, San Luis Potosi, Mexico.
 |  USNM_1282268
 Rio Tamuin [Tampaón], at Mex. 85 just S of Alvero Obregon, S of Ciudad Valles, San Luis Potosi, Mexico.
 |  |  USNM_1282269
 Rio Tamuin [Tampaón], at Mex. 85 just S of Alvero Obregon, S of Ciudad Valles, San Luis Potosi, Mexico.
 |  USNM_1282269B
 Rio Tamuin [Tampaón], at Mex. 85 just S of Alvero Obregon, S of Ciudad Valles, San Luis Potosi, Mexico.
 |  USNM_1282269B
 Rio Tamuin [Tampaón], at Mex. 85 just S of Alvero Obregon, S of Ciudad Valles, San Luis Potosi, Mexico.
 |  |  USNM_1282728
 Rio Tamuin [Tampaón], at Mex. 85 just S of Alvero Obregon, S of Ciudad Valles, San Luis Potosi, Mexico.
 |  INHS_21759
 Rio Valles, Valles, Mexico
 |  INHS_21760
 Rio Valles, Valles, Mexico
 |  |  INHS_21761
 Rio Valles, Valles, Mexico
 |  INHS_21796
 Rio Valles, Valles, Mexico
 |  USNM_1282266
 San Luis Potosi, Rio Ganina at road to Estacion Rascon, ca. 3.4 roadmiles N of the junction of this road with Rt. Mex. 70 (this junction is ca. 19.5 roadmiles W of the junction of Rt. Mex. 85 and Rt. Mex. 70 in Ciudad Valles
 |  |  USNM_1282267
 San Luis Potosi, Rio Ganina at road to Estacion Rascon, ca. 3.4 roadmiles N of the junction of this road with Rt. Mex. 70 (this junction is ca. 19.5 roadmiles W of the junction of Rt. Mex. 85 and Rt. Mex. 70 in Ciudad Valles
 |  USNM_1282548
 San Luis Potosi, river (called Rio Estero by local man) at Rt. Mex. 110 ca. 17.6 roadmiles E of intersection of Rt. Mex. 110 and Rt. Mex. 85 in Ciudad Valles
 |  USNM_1282272
 Tamaulipas, creek flowing into Rio Frio ca. 0.5 rivermiles (not measured) above bridge of Rt. Mex. 85 over Rio Frio at Rio Frio (town)
 |  |  USNM_1282294
 Tamaulipas, Rio Guayalejo at Rt. Mex. 80 near Mexcoltzin. ca. 17.9 roadmiles E of Ciudad Mante (measured from circle in southern Mante where the Tampico, Mante, and Valles roads diverge)
 |  USNM_1282550
 Tamaulipas, Rio Guayalejo at Rt. Mex. 80 near Mexcoltzin. ca. 17.9 roadmiles E of Ciudad Mante (measured from circle in southern Mante where the Tampico, Mante, and Valles roads diverge)
 |  USNM_1282550
 Tamaulipas, Rio Guayalejo at Rt. Mex. 80 near Mexcoltzin. ca. 17.9 roadmiles E of Ciudad Mante (measured from circle in southern Mante where the Tampico, Mante, and Valles roads diverge)
 |  |  USNM_1282271
 Tamaulipas, Rio Sabinas at Rt. Mex. 85 near Sabinas, ca. 7.3 roadmiles S of El Encino, ca. 7 miles (not measured) N of intersection of Rt. Mex. 85 and the road to Xicotencatl
 |  USNM_1282270
 Tamaulipas, stream at Rt. Mex. 80 ca. 3.1 roadmiles E of Ciudad Mante (measured from circle in southern Mante where the Tampico, Mante, and Valles roads diverge)
 |  USNM_1282540
 Valles River, ca. 0.4 roadmiles S (downriver) of railroad station in Micos, ca. 1.5 mi N (toward Micos) of Plantas Hidroelectrica de Micos, ca. 14 mi NW of Ciudad Valles, San Luis Potosi, Mexico
 |  |  UF_65414
 Valles River, Valles, San Luis Potosi, Mexico
 |  UF_270356
 Valles River, Valles, San Luis Potosi, Mexico muddy banks
 | 
 UMMZ_108003C. Valles River, 2 mi above Mecos, Mexico CM_61.4494B. Valles River, Valles, Mexico |