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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!

Search the database pages:

Bivalvia | Unionoida | Unionoidea | Unionidae | Ambleminae | Popenaiadini | Nephronaias

species Nephronaias caldwellii (Lea, 1858): specimens
     2 available nominal species synonyms

Recent Taxonomic Opinions

Barynaias caldwelliiGraf & Cummings (2007), Bogan (2010), Graf & Cummings (2021)
Nephronaias caldwelliiCummings et al. (2025)

Range

Widely distributed in Pacific drainages from Mexico, Guatemala, and Nicaragua to Panama.

Map of Georeferenced Specimens

species map


Guatemala

specimen
MNHN_MP_1330

Rio Naranjo, Guatemala

specimen
SMF_83308

Rio Puca, Costa Grande, Retahuleu, West Guatemala

specimen
ZMB_47544

Rio Puca, Retaluleu, Guatemala


Nicaragua

specimen
AMNH_35565

Nicaragua

specimen
ANSP_125620

Nicaragua

specimen
ANSP_129946

Nicaragua

specimen
MCZ_16344

Nicaragua

specimen
MCZ_6592

Nicaragua

specimen
MCZ_MP_300_01

Nicaragua

specimen
ANSP_125619

Rio San Antonio, near Chinendaga, Nicaragua

specimen
MCZ_MP_275

stream from Volcano Veijo at Hacienda San Antonio 1 league [3 mi] SE Chinandega, Chinandega State, Nicaragua


Panama

specimen
FMNH_73370

Bayano River, above Chepo, Panama Prov., Panama

specimen
FMNH_110180

Bayano River, El Llano, Panama Prov., Panama

specimen
USNM_536560

Bayano River, near Acanti, Panama

specimen
USNM_536560

Bayano River, near Acanti, Panama

specimen
ANSP_161833

Bayano River, Pintupo, Darien, Rep. Panama

specimen
FMNH_63537

Bayano River, Pintupo, Darrien, Panama

specimen
UMMZ_107957

Chimaugua River, Isthmus of Darien, Panama

specimen
MCZ_293266

Chucunaque River, Isthmus of Darien, Panama

specimen
USNM_84385

Chumnagua R., Isth. of Darien

specimen
USNM_84385

Chumnagua R., Isth. of Darien

specimen
AMNH_179584

Darien, Canal Zone, Panama

specimen
USNM_513600

Isla de Coiba, Panama

specimen
USNM_84396

Isthmus of Darien

specimen
USNM_84396

Isthmus of Darien

specimen
NCSM_6243

North America, Golfo de San miguel asin/ Rio Chucunaque/ Rio Membrillo Panama, Darién, Rio Membrillo (Rio Chucunaque-Rio Turia drainage), ca 5km, upstream Siani

specimen
USNM_424421

Republic of Panama

specimen
ANSP_243690

Rio Banayo at El Llano, 15 mi fr. Chepo, Republic of Panama

specimen
ANSP_162482

Rio Bayano just below El Llano, Panama

specimen
USNM_361760

Rio Chucunaque, above Rio Chiati, Panama

specimen
USNM_361760

Rio Chucunaque, above Rio Chiati, Panama

specimen
INHS_21691

Rio Membrillo, ca. 5 km upstream Sinai, Darien, Panama

specimen
AMS_140904

Rio Turia, Boca de Cupe, Darien Prov., Panama


unknown

specimen
BMNH_93-2-4-2041-2042

Am. Centrale