MUSSELpdb | valid sp. Pachynaias spheniopsis specimens

	Home \| About \| Database \| Mussel of the Month \| Publications & Presentations


MUSSELpdb
	Introduction Browse d'basing


Taxonomy
	all genera Unionidae Margaritiferidae Hyriidae Etheriidae Mycetopodidae Iridinidae Species & Genus Richness by Taxonomy


Geography
	Summary North America Central America South America Afrotropics North Eurasia East Asia Australasia Species Richness & Endemism by Geography

Page last updated
Thu 17 July 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!

species Pachynaias spheniopsis (Morelet, 1849): specimens
1 available nominal species synonym

Recent Taxonomic Opinions

Pachynaias spheniopsis — Graf & Cummings (2007), Bogan (2010), Pfeiffer et al. (2019), Pfeiffer et al. (2019), Inoue et al. (2020), Smith et al. (2020), Graf & Cummings (2021), Czaja et al. (2023), Freeman et al. (2025)

Range

Northern Guatemala to southern Mexico.

Map of Georeferenced Specimens

species map

Guatemala

MCZ_MP_295 3 mi above mouth Rio Santa Amelia, Peten, Guatemala	MCZ_MP_295 3 mi above mouth Rio Santa Amelia, Peten, Guatemala	BMNH_93-2-4-2028 flumen Usumacinta, Guatemala
BMNH_93-2-4-2028 flumen Usumacinta, Guatemala	BMNH_93-2-4-2028 flumen Usumacinta, Guatemala	SMF_12777 Guatemala
USNM_128982 Guatemala	USNM_128982 Guatemala	ANSP_177257 Pasion R., rapids above Tres Islas, Dept. Peten, Guatemala
ANSP_177257 Pasion R., rapids above Tres Islas, Dept. Peten, Guatemala	MCZ_99322 Pasion River, above Tres Islas, Dept. Peten, Guatemala	UF_507904 Rio De La Pasion, 5.5 miles east of Sayaxche, El Peten Department, Guatemala 16.536339, -90.103900
USNM_783042 Rio de la Pasion, Santa Amelia, Peten, Guatemala	USNM_783042 Rio de la Pasion, Santa Amelia, Peten, Guatemala	USNM_783043 Rio de la Pasion, Santa Amelia, Peten, Guatemala
USNM_783043 Rio de la Pasion, Santa Amelia, Peten, Guatemala	USNM_783044 Rio de la Pasion, Santa Amelia, Peten, Guatemala	USNM_783044 Rio de la Pasion, Santa Amelia, Peten, Guatemala
USNM_783060 Rio de la Pasion, Santa Amelia, Peten, Guatemala	USNM_783060 Rio de la Pasion, Santa Amelia, Peten, Guatemala	ZMB_108850 Rio Salinas, Guatemala
ZMB_108850 Rio Salinas, Guatemala	MNHN-IM-2000-1791 Rio Usumacinta, Guatemala	MNHN-IM-2000-1791 Rio Usumacinta, Guatemala
SMF_12776 Rio Usumacinta, Guatemala	SMF_12783 Rio Usumacinta, Guatemala	USNM_128985 Rio Usumacinta, Guatemala
USNM_128990 Rio Usumacinta, Guatemala	OSUM_18869 Santa Amelia, [above mouth Santa Amelia River] Chixoy basin	MCZ_293590 Usumacinta River, Yaxchilan, 106 mi downstream from Sayache, Mexico
MCZ_293590 Usumacinta River, Yaxchilan, 106 mi downstream from Sayache, Mexico

BMNH_93-2-4-2029. Rio Usumacinta, Guatemala

Mexico

UF_270397 Grijalva River, Mexico	USNM_161477 Monte Cristo, Tabasco, Mexico	USNM_161477 Monte Cristo, Tabasco, Mexico
UF_164069 Rio San Pedro, 3 km N La Palma, Tabasco, Mexico	UF_164070 Rio San Pedro, 3 km N La Palma, Tabasco, Mexico	AMS_102116 Rio Usumacinta, Emiliano Zapata, Tabasco, Mexico
MCZ_288419 Rio Usumacinta, Emiliano Zapata, Tabasco, Mexico	UF_190665 Rio Usumacinta, Emiliano Zapata, Tabasco, Mexico	USNM_178659 Rio Usumacinta, Tenosique, Tabasco, Mexico
UF_507900 Usumacinta River, opposite of Emiliano Zapata. Tabasco, Mexico. 17.749685, -91.766995