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MUSSELpdb

Taxonomy

Species & Genus Richness by
Taxonomy

Geography

Species Richness & Endemism by
Geography

Data last updated
Mon 1 Dec 2025

species Megalonaias nervosa (Rafinesque, 1820): specimens

7 available nominal species synonyms (14 total synonyms)

Recent Taxonomic Opinions

Megalonaias nervosa — Graf & Cummings (2007), Tiemann et al. (2007), Williams et al. (2008), Watters et al. (2009), Bogan (2010), ... Hopper et al. (2023), Hauck et al. (2023), Ma et al. (2024), FMCS (2025), Cummings et al. (2025)
Megalonaias boykiniana — Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Megalonaias gigantea — ITIS (2012)
Tritogonia nervosa — ITIS (2012)
M. nervosa — Marshall et al. (2018)

Range

Widespread in the Interior Basin and Gulf Coastal Plain, including the Ochlochonee of Florida, USA south into Mexico.

Map of Georeferenced Specimens

specimens map of Megalonaias nervosa

MUSSELp Specimen Records

Guatemala

UF_507902 Rio De La Pasion, 5.5 miles east of Sayaxche, El Peten Department, Guatemala 16.536339, -90.103900	USNM_783053 Rio de la Pasion, Guatemala	USNM_783054 Rio de la Pasion, Guatemala
USNM_783056 Rio de la Pasion, Guatemala	USNM_783064 Rio de la Pasion, Guatemala

Mexico

UF_270395 Nuevo Leon, Mexico	INHS_89425 Rio Tempoal, Tempoal, Veracruz, Mexico	USNM_83991 Sabinas R., Nuevo Leon, Mexico
USNM_83991 Sabinas R., Nuevo Leon, Mexico	USNM_83991 Sabinas R., Nuevo Leon, Mexico	USNM_123293 Vera Cruz, Mexico
UF_270398 Veracruz, Mexico

USA

USNM_83903
Columbus, Georgia

USNM_150554
Coosa Riv., St. Clair Co., Ala.

USNM_709225. United States, New Mexico, Eddy County, Pecos River, below McMillan Reservoir Dam

USNM_592725. United States, New Mexico, Eddy County, Pecos River, Malaga Bend

Genbank Vouchers

Georeferenced Genbank Vouchers

USA

UAUC_266. (COI: AY655007, ND1: AY158794, go to Genbank) Coosa River, near Leesburg, downstream from mouth of Terrapin Ck., Cherokee Co., AL.

UF_438512. (16S: MK001793, 28S: MK001827, COI: MF960144, go to Genbank) USA, Florida, Santa Rosa County, Escambia River, about 0.3 mi above Chumuckla Springs boat ramp (30.82597, -87.29701).

UF_439113 (MnerOhi057). (5.8S: MH362616, COI: MH633645, ITS1: MH362616, ND1: MH633597, go to Genbank) USA, Ohio, Wood County, Ohio River, Buckley Island backchannel (39.391231, -81.420944).

UF_438300 (MnerGua025). (5.8S: MH362471, COI: MH633619, ITS1: MH362471, ND1: MH633571, go to Genbank) USA, Texas, Guadalupe County, Lake Wood State Park - Guadalupe River - just below Lake Wood Dam ~80 m below spillway (29.46975, -97.49062).

JBFMC_12095_1. (16S: PQ238847, go to Genbank) USA: Texas, Red River.