| 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 | Hyrioidea | Hyriidae | Hyriinae | Castaliini | Castalia species Castalia stevensi (H.B. Baker, 1930): specimens1 available nominal species synonym
 Recent Taxonomic OpinionsCastalia __ — Hoeh et al. (2009)Castalia stevensi — Bogan (2010), Pereira et al. (2014), Zieritz et al. (2015), Santos-Neto et al. (2016), Santos-Neto et al. (2018), Olivera-Hyde et al. (2020), Graf & Cummings (2021)
 RangeOrinoco and Essiquibo basins of Colombia, Venezuela and Guyana. Map of Georeferenced Specimens
 Colombia|  FMNH_114116
 Bocas Rio Iteviare (Vichada), Bajo Rio Guaviare, Colombia
 |  FMNH_114139
 Bocas Rio Iteviare (Vichada), Bajo Rio Guaviare, Colombia
 |  FMNH_114034
 Bocas Rio Iteviare (Vichada), Bajo Rio Guaviare, Colombia; 2°58’N, 70°45’W
 | 
 
 Guyana
 Venezuela|  INHS_14890
 Caño el Sardinero, 14 km SE Guanare, Portuguesa, Venezuela
 |  INHS_14946
 Caño el Sardinero, 14 km SE Guanare, Portuguesa, Venezuela
 |  INHS_14910
 Caño Hondo, Agua Negra, Barinas, Venezuela
 |  |  INHS_14931
 Caño Igües, La Capilla, Portuguesa, Venezuela
 |  INHS_84697
 Cano Mamon  (Rio Orinoco - Apure Dr.) El Mamon, 24 km E Guanare, Portuguesa, Venezuela, 9.07106, -69.52521
 |  INHS_85051
 Caño Maraca, 12.6 mi NW Guanarito, Portuguesa, Venezuela
 |  |  INHS_14902
 Cano Maraca, 60 km S Guanare, on rd to Guanarito, Portuguesa, Venezuela
 |  INHS_14939
 Cano Maraca, 60 km S Guanare, on rd to Guanarito, Portuguesa, Venezuela
 |  INHS_17020
 Cano Maraca, 60 km S Guanare, on rd to Guanarito, Portuguesa, Venezuela
 |  |  INHS_17026
 Cano Maraca, 60 km S Guanare, on rd to Guanarito, Portuguesa, Venezuela
 |  INHS_17583
 Cano Maraca, 60 km S Guanare, on rd to Guanarito, Portuguesa, Venezuela
 |  UF_29403
 Cano Maraca, 60 km S Guanare, on rd to Guanarito, Portuguesa, Venezuela
 |  |  UF_29403
 Cano Maraca, 60 km S Guanare, on rd to Guanarito, Portuguesa, Venezuela
 |  INHS_17016
 Caño Maraca, SW Agua Clara, Portuguesa, Venezuela
 |  INHS_14804
 Caño Masparito, 1 km NW Libertad, Barinas, Venezuela
 |  |  INHS_17034
 Caño Terecay, Hato Cañafistola, eastern Apure, Apure, Venezuela
 |  USNM_860428
 Caripe River, Caripito, Venezuela
 |  UCM_32344
 floodplain lake along N shore Orinoco River, 2 km E Soledad, Anzoategui, Venezuela.
 |  |  MCZ_MP.89
 Istampk [?], below Barrancas 62°8’ W  8°30’N
 |  MNHN_MP_1402
 Orenoque
 |  MNHN_MP_1402
 Orenoque
 |  |  MNHN_MP_1391
 Orenoque, Venezuela
 |  MNHN_MP_0879
 Orinoco
 |  MNHN_MP_0879
 Orinoco
 |  |  INHS_14920
 Rio Camoruco, 3 km SE Libertad, Cojedes, Venezuela
 |  INHS_14892
 Rio Camoruco, between Estero & Campo Alegre, about 10 km NW Libertad, Cojedes, Venezuela
 |  INHS_14932
 Rio Guarico, Barbacoas, Aragua, Venezuela
 |  |  INHS_7661
 Rio Mocapra, near La Esperanza, cerca del caserio La Esperanza, Infante/ Miranda Districts, Guarico, Venezuela
 |  INHS_11888
 Rio Tinaco, El Baul, Cojedes, Venezuela
 |  INHS_46955
 Rio Ventuari, base of Cerro Moriche, 1 km upstream Moriche community, 167 km ENE San Fernando de Atabapo, Manapiare, Amazonas, Venezuela
 |  |  INHS_14904
 trib. Caño Igues, 20 km SE Guanare on rd. to Guanarito, Portuguesa, Venezuela
 |  MNHN_MP_0795
 Venezuela
 |  ANSP_125531
 Yuruari River, Venezuela
 |  |  ANSP_125531A
 Yuruari River, Venezuela
 |  SMF_4661
 Yuruari River, Venezuela
 | 
 ZMA_419632. Cano Las Mulas, Bruzual, Apure, Venezuela |