| 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 | Popenaiadini | Nephronaias species Nephronaias aztecorum (Philippi, 1847): specimens6 available nominal species synonyms (10 total synonyms)
 Recent Taxonomic OpinionsNephronaias aztecorum — Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Czaja et al. (2023), Cummings et al. (2025)Nephronaias plicatula — Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Czaja et al. (2023)
 — Cummings et al. (2025)
 RangeVera Cruz, Mexico. Map of Georeferenced Specimens
 Mexico|  NCSM_62219
 Arroyo Acuatempa, 3.2 km N Novo Progresso, 9.75 km S Tihuatlan, Veracruz, Mexico
 |  UF_77730
 Arroyo en el, km 294, Carretaera Mexico, Tuxpam, Veracruz, Mexico
 |  USNM_769431
 Barra de Nautla, Vera Cruz, Mexico
 |  |  USNM_769431
 Barra de Nautla, Vera Cruz, Mexico
 |  ANSP_142603
 Chachalacas River, V.C. Mexico
 |  AMS_102115
 creek, 0.7 mi W Hueyapan de Campo, Veracruz, Mexico
 |  |  UF_270417
 creek, 2 km E Aquismon, 21° 37.4’ N, 99° 00.0’ W, San Luis Potosi, Mexico
 |  INHS_90934
 Laguna de Catazaja, Gulf of Mexico - Grijalva - Usumacinta, Catazajá, Chiapas, Mexico
 |  ANSP_13665
 Mexico
 |  |  ANSP_13665
 Mexico
 |  ANSP_13665
 Mexico
 |  UF_270351
 Mexico
 |  |  ZMB_MP_0491
 Mexico
 |  ZMB_MP_0500
 Mexico
 |  ZMB_MP_0504
 Mexico
 |  |  MNHN-IM-2000-1785
 Mexique, La Soledad
 |  MNHN-IM-2000-1785
 Mexique, La Soledad
 |  ZMB 220172,  220182
 Misantlla, Mexico
 |  |  ZMB 220173, 220183
 Misantlla, Mexico
 |  ZMB_MP_0506
 Misantlla, Mexico
 |  ZMB_MP_0507
 Misantlla, Mexico
 |  |  USNM_178653
 Mozorongo, Vera Cruz, Mexico
 |  FMNH_66518
 Pital Creek, near Pital y Mozutla (S of Tuxpan), Veracruz, Mexico
 |  INHS_91088
 Puente Tulija, Gulf of Mexico - Grijalva - Chilapa - Tulija - Xanil, ENE Cascadas de Agua Azul, Rt. 199, Chiapas, Mexico
 |  |  INHS_91090
 Puente Tulija, Gulf of Mexico - Grijalva - Chilapa - Tulija - Xanil, ENE Cascadas de Agua Azul, Rt. 199, Chiapas, Mexico
 |  OSUM_20032
 Rio Atoyac, between Vera Cruz and Anton Lizardo, Veracruz, Mexico, 18.78931800, -95.7482660.
 |  ZMB_MP_0492
 Rio de Misantla
 |  |  ZMB_MP_0498
 Rio de Misantla
 |  ZMB_9104
 Rio de Misantla, Mexico
 |  ZMB_9104
 Rio de Misantla, Mexico
 |  |  ZMB_9105
 Rio de Misantla, Mexico
 |  ZMB_9107
 Rio de Misantla, Mexico
 |  USNM_1282381
 Rio Huichiuayan at road to Xilitla ca. 0.7 roadmiles from its junction with Rt Mx 85 (this junction is ca 43.6 roadmiles S of junction of Rt Mx 85 and 70 in Ciudad Valles), San Luis Potosi, Mexico.
 |  |  USNM_1282536-39
 Rio Huichiuayan at road to Xilitla ca. 0.7 roadmiles from its junction with Rt Mx 85 (this junction is ca 43.6 roadmiles S of junction of Rt Mx 85 and 70 in Ciudad Valles), San Luis Potosi, Mexico.
 |  USNM_1282549
 Rio Huichiuayan at road to Xilitla ca. 0.7 roadmiles from its junction with Rt Mx 85 (this junction is ca 43.6 roadmiles S of junction of Rt Mx 85 and 70 in Ciudad Valles), San Luis Potosi, Mexico.
 |  USNM_1282549
 Rio Huichiuayan at road to Xilitla ca. 0.7 roadmiles from its junction with Rt Mx 85 (this junction is ca 43.6 roadmiles S of junction of Rt Mx 85 and 70 in Ciudad Valles), San Luis Potosi, Mexico.
 |  |  MCZ_288441
 Rio Nautla, Paso Largo, 10.9 km ENE Martinez de la Torre, Veracruz, Mexico
 |  USNM_1282573-74
 Rio Pantepec across the river from Chapopote, near Alamo, ca. 100-300 yards upriver from the new bridge of the Temapache-Alamo road
 |  MNHN_MP_1349
 Rio Papaloapam, Vera Cruz
 |  |  AMS_102127
 Rio Paso de Milpa, 5.4 km NNE Rinconada, Antigua, Veracruz, Mexico
 |  MCZ_288433
 Rio Paso de Milpa, 5.4 km NNE Rinconada, Antigua, Veracruz, Mexico
 |  UF_271145
 Rio Sabinas, Hwy 85, Sabinas, Tamaulipas, Mexico
 |  |  UF_285360
 Rio Santa Clara, 1 km NNW Refugio, Tamaulipas, Mexico 22° 31.1’N, 98° 54.9’W
 |  UF_285360
 Rio Santa Clara, 1 km NNW Refugio, Tamaulipas, Mexico 22° 31.1’N, 98° 54.9’W
 |  NCSM_61423
 Rio Tamesi, Hwy. 80, @16 km W Magiscatzin, Tamaulipas, Mexico
 |  |  NCSM_61423
 Rio Tamesi, Hwy. 80, @16 km W Magiscatzin, Tamaulipas, Mexico
 |  USNM_1282380
 Rio Tamuin [Tampaón], at Mex. 85 just S of Alvero Obregon, S of Ciudad Valles, San Luis Potosi, Mexico.
 |  USNM_1282534-35
 Rio Tamuin [Tampaón], at Mex. 85 just S of Alvero Obregon, S of Ciudad Valles, San Luis Potosi, Mexico.
 |  |  INHS_89531
 Rio Valles, Rancho Adventura Huasteca, 10 mi NW Valles, San Luis Potosi, Mexico. 22.09155, -99.11622
 |  AMS_102117
 Rio Vinazco, 2.1 mi N Alamo, Veracruz, Mexico
 |  UF_215324
 river, 14 km E Xilitla, San Luis Potosi, Mexico, 21° 26’ 13” N, 98° 56’ 00” W
 |  |  UF_215327
 river, 14 km E Xilitla, San Luis Potosi, Mexico, 21° 26’ 13” N, 98° 56’ 00” W
 |  USNM_1283213
 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_1282542
 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)
 |  |  FMNH_49615
 Troncones Creek, nr. Coatzintla, Veracruz, Mexico
 |  USNM_1282541
 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
 |  USNM_1282541B
 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
 |  |  NCSM_5808
 Vega de Colipa, 7.3 km N Carranza, 32 km SE Nautla
 |  ANSP_125613
 Vera Cruz, Mexico
 |  ANSP_125613
 Vera Cruz, Mexico
 |  |  USNM_85019
 Vera Cruz, Mexico
 |  USNM_85019
 Vera Cruz, Mexico
 |  USNM_85661
 Vera Cruz, Mexico
 |  |  USNM_85661
 Vera Cruz, Mexico
 |  USNM_1282326
 Veracruz, river ca. 1.5-2 rivermiles above bridge of Rt. Mex. 180 (ca. 3.7 roadmiles N of central square of Cardel) above Gloria (in an area locally called Real del Oro Vero). N19°25'00" W96°22'30" 10 Feb 82 and 14 Feb 82
 |  ZMB_MP_0505
 Zimapan, on the Rio San Juan, southern confluent of the Panuco, Mexico
 | 
 COMA_B.0317. Laguna de San Marcos, San Cristóbal, Veracruz, México COMA_B.0242. Nautla, Veracruz, Mexico NCSM_61427. Rio Axtla, Comoca, San Luis Potosi, Mexico IRSNB_3736. Soledad, Mexique NCSM_5807. Vega de Colipa, 7.3 km N Carranza, 32 km SE Nautla 
 unknown |