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), ... Freeman et al. (2025), Cummings et al. (2025), Campbell & Lydeard (2026), Martínez et al. (2026), Barraza et al. (2026)
Pachynaias rugosulcata [sic] — Graf & Cummings (2007), Bogan (2010)
Pachynaias rugososulcata — Graf & Cummings (2021)

Range

Río Usumacinta drainage, Guatemala and Mexico. (Central America: CA1)

Map of Georeferenced Specimens

specimens map of Pachynaias spheniopsis

MUSSELp Specimen Records

Type Specimens

image of lot ZMB_108850
ZMB_108850
Rio Salinas, Guatemala
holotype
Unio grossus Martens, 1900

image of lot USNM_84392
USNM_84392
Central America
lectotype
Unio rugososulcatus Lea, 1866

image of lot BMNH_93-2-4-2028
BMNH_93-2-4-2028
flumen Usumacinta, Guatemala
lectotype
Unio spheniopsis Morelet, 1849

image of lot MNHN_IM-2000-1791
MNHN_IM-2000-1791
Rio Usumacinta, Guatemala
paralectotype
Unio spheniopsis Morelet, 1849

image of lot SMF_3474
SMF_3474
Central America
paralectotype
Unio rugososulcatus Lea, 1866

BMNH_93-2-4-2029. Rio Usumacinta, Guatemala — lectotype [as holotype] Unio spheniopsis Morelet, 1849

Other Specimens by Country | show by collection

16 Specimens from Guatemala

image of lot MCZ_MP_295
MCZ_MP_295
3 mi above mouth Rio Santa Amelia, Peten, Guatemala

image of lot SMF_12777
SMF_12777
Guatemala

image of lot USNM_128982
USNM_128982
Guatemala

image of lot ANSP_177257
ANSP_177257
Pasion R., rapids above Tres Islas, Dept. Peten, Guatemala

image of lot MCZ_99322
MCZ_99322
Pasion River, above Tres Islas, Dept. Peten, Guatemala

image of lot UF_507904
UF_507904
Rio De La Pasion, 5.5 miles east of Sayaxche, El Peten Department, Guatemala 16.536339, -90.103900

image of lot USNM_783042
USNM_783042
Rio de la Pasion, Santa Amelia, Peten, Guatemala

image of lot USNM_783043
USNM_783043
Rio de la Pasion, Santa Amelia, Peten, Guatemala

image of lot USNM_783044
USNM_783044
Rio de la Pasion, Santa Amelia, Peten, Guatemala

image of lot USNM_783060
USNM_783060
Rio de la Pasion, Santa Amelia, Peten, Guatemala

image of lot SMF_12776
SMF_12776
Rio Usumacinta, Guatemala

image of lot SMF_12783
SMF_12783
Rio Usumacinta, Guatemala

image of lot USNM_128985
USNM_128985
Rio Usumacinta, Guatemala

image of lot USNM_128990
USNM_128990
Rio Usumacinta, Guatemala

image of lot OSUM_18869
OSUM_18869
Santa Amelia, [above mouth Santa Amelia River] Chixoy basin

image of lot MCZ_293590
MCZ_293590
Usumacinta River, Yaxchilan, 106 mi downstream from Sayache, Mexico

9 Specimens from Mexico

image of lot UF_270397
UF_270397
Grijalva River, Mexico

image of lot USNM_161477
USNM_161477
Monte Cristo, Tabasco, Mexico

image of lot UF_164069
UF_164069
Rio San Pedro, 3 km N La Palma, Tabasco, Mexico

image of lot UF_164070
UF_164070
Rio San Pedro, 3 km N La Palma, Tabasco, Mexico

image of lot AMS_102116
AMS_102116
Rio Usumacinta, Emiliano Zapata, Tabasco, Mexico

image of lot UF_190665
UF_190665
Rio Usumacinta, Emiliano Zapata, Tabasco, Mexico

image of lot MCZ_288419
MCZ_288419
Rio Usumacinta, Emiliano Zapata, Tabasco, Mexico

image of lot USNM_178659
USNM_178659
Rio Usumacinta, Tenosique, Tabasco, Mexico

image of lot UF_507900
UF_507900
Usumacinta River, opposite of Emiliano Zapata. Tabasco, Mexico. 17.749685, -91.766995

GenBank Vouchers

Georeferenced GenBank Vouchers

Mexico

UF_507900. (SRA: SRX5278597, 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.

GenBank Vouchers Not Yet Georeferenced

Z_12470 (2018-0553). (16S: MK001805, 28S: MK001839, COI: MK001773, go to GenBank)