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!

Bivalvia | ... | Unionidae | Ambleminae | Quadrulini | Megalonaias

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), ... Smith (2021), Czaja et al. (2023), Neemuchwala et al. (2023), Hopper et al. (2023), Hauck et al. (2023)
Megalonaias boykiniana — Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Tritogonia nervosa — ITIS (2012)
Megalonaias gigantea — 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

Guatemala

Mexico

USA

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

Georeferenced Genbank Vouchers

USA

UAUC_266. (COI, ND1) Coosa River, near Leesburg, downstream from mouth of Terrapin Ck., Cherokee Co., AL

UF_438512. (16S, 28S, COI) 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, COI, ITS1, ND1) USA, Ohio, Wood County, Ohio River, Buckley Island backchannel (39.391231, -81.420944)

UF_438300 (MnerGua025). (5.8S, COI, ITS1, ND1) 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) USA: Texas, Red River