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Data last updated
Mon 1 Dec 2025
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Bivalvia
| Unionoida
| Unionoidea
| Unionidae
| Ambleminae
| Lampsilini
| Pachynaias
species Pachynaias spheniopsis (Morelet, 1849): specimens3 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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MCZ_MP_295
3 mi above mouth Rio Santa Amelia, Peten, Guatemala
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MCZ_MP_295
3 mi above mouth Rio Santa Amelia, Peten, Guatemala
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BMNH_93-2-4-2028
flumen Usumacinta, Guatemala
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BMNH_93-2-4-2028
flumen Usumacinta, Guatemala
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BMNH_93-2-4-2028
flumen Usumacinta, Guatemala
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SMF_12777
Guatemala
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USNM_128982
Guatemala
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USNM_128982
Guatemala
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ANSP_177257
Pasion R., rapids above Tres Islas, Dept. Peten, Guatemala
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ANSP_177257
Pasion R., rapids above Tres Islas, Dept. Peten, Guatemala
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MCZ_99322
Pasion River, above Tres Islas, Dept. Peten, Guatemala
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UF_507904
Rio De La Pasion, 5.5 miles east of Sayaxche, El Peten Department, Guatemala 16.536339, -90.103900
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USNM_783042
Rio de la Pasion, Santa Amelia, Peten, Guatemala
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USNM_783042
Rio de la Pasion, Santa Amelia, Peten, Guatemala
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USNM_783043
Rio de la Pasion, Santa Amelia, Peten, Guatemala
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USNM_783043
Rio de la Pasion, Santa Amelia, Peten, Guatemala
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USNM_783044
Rio de la Pasion, Santa Amelia, Peten, Guatemala
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USNM_783044
Rio de la Pasion, Santa Amelia, Peten, Guatemala
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USNM_783060
Rio de la Pasion, Santa Amelia, Peten, Guatemala
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USNM_783060
Rio de la Pasion, Santa Amelia, Peten, Guatemala
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ZMB_108850
Rio Salinas, Guatemala
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ZMB_108850
Rio Salinas, Guatemala
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MNHN-IM-2000-1791
Rio Usumacinta, Guatemala
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MNHN-IM-2000-1791
Rio Usumacinta, Guatemala
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SMF_12776
Rio Usumacinta, Guatemala
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SMF_12783
Rio Usumacinta, Guatemala
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USNM_128985
Rio Usumacinta, Guatemala
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USNM_128990
Rio Usumacinta, Guatemala
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OSUM_18869
Santa Amelia, [above mouth Santa Amelia River] Chixoy basin
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MCZ_293590
Usumacinta River, Yaxchilan, 106 mi downstream from Sayache, Mexico
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MCZ_293590
Usumacinta River, Yaxchilan, 106 mi downstream from Sayache, Mexico
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BMNH_93-2-4-2029. Rio Usumacinta, Guatemala
Mexico
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UF_270397
Grijalva River, Mexico
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USNM_161477
Monte Cristo, Tabasco, Mexico
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USNM_161477
Monte Cristo, Tabasco, Mexico
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UF_164069
Rio San Pedro, 3 km N La Palma, Tabasco, Mexico
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UF_164070
Rio San Pedro, 3 km N La Palma, Tabasco, Mexico
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AMS_102116
Rio Usumacinta, Emiliano Zapata, Tabasco, Mexico
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MCZ_288419
Rio Usumacinta, Emiliano Zapata, Tabasco, Mexico
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UF_190665
Rio Usumacinta, Emiliano Zapata, Tabasco, Mexico
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USNM_178659
Rio Usumacinta, Tenosique, Tabasco, Mexico
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UF_507900
Usumacinta River, opposite of Emiliano Zapata. Tabasco, Mexico. 17.749685, -91.766995
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unknown
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.
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