MUSSELpdb
Taxonomy
Species & Genus Richness of
freshwater mussels
by Taxonomy
Species & Genus Richness of
freshwater bivalves
by Family
Geography
Species Richness & Endemism of
freshwater mussels
by Geography
Data last updated
Thu 22 January 2026
Bivalvia | Unionida | Unionoidea | Unionidae | Ambleminae | Lampsilini | Pachynaias
species Pachynaias spheniopsis (Morelet, 1849): specimens
3 available nominal species synonyms (4 total synonyms)
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), Cummings et al. (2025)
Pachynaias rugosulcata [sic] — Graf & Cummings (2007), Bogan (2010)
Pachynaias rugososulcata — Graf & Cummings (2021)
Range
Río Usumacinta drainage, Guatemala and Mexico.
Map of Georeferenced Specimens
MUSSELp Specimen Records
Guatemala
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BMNH_93-2-4-2029. Rio Usumacinta, Guatemala
Mexico
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unknown
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Genbank Vouchers
Georeferenced Genbank Vouchers
Mexico
UF_507900. (SRA: SRR8473029, go to Genbank) Mexico, Tabasco, Usumacinta River, opposite Emiliano Zapata (17.749685, -91.766995) .
UF_507900 (2015-0721). (16S: MK001806, 28S: MK001840, COI: MK001774, go to Genbank) ditto.