Bivalvia | Unionida | Unionoidea | 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), ... Hauck et al. (2023), Ma et al. (2024), FMCS (2025), Cummings et al. (2025), Campbell & Lydeard (2026)
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. (North America: NA2 NA4)

Map of Georeferenced Specimens

specimens map of Megalonaias nervosa

MUSSELp Specimen Records

Type Specimens

image of lot USNM_83903
USNM_83903
Columbus, Georgia
topotype
Unio boykinianus Lea, 1840

image of lot USNM_83991
USNM_83991
Sabinas R., Nuevo Leon, Mexico
lectotype
Unio eightsii Lea, 1860

image of lot USNM_150554
USNM_150554
Coosa Riv., St. Clair Co., Ala.
holotype
Unio triumphans B.H. Wright, 1898

Other Specimens by Collection | show by country

1 Specimens from INHS

image of lot INHS_89425
INHS_89425
Rio Tempoal, Tempoal, Veracruz, Mexico

2 Specimens from UF

image of lot UF_270395
UF_270395
Nuevo Leon, Mexico

image of lot UF_270398
UF_270398
Veracruz, Mexico

3 Specimens from USNM

image of lot USNM_123293
USNM_123293
Vera Cruz, Mexico

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

UF_438300 (MnerGua025). (COI: MH633619, ITS1, 5.8S: 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.

GenBank Vouchers Not Yet Georeferenced

ANSP_346111. (28S: U82337, go to GenBank)

JBFMC_10003. (transcriptome shotgun assembly: GKMI00000000, go to GenBank)

JGPickwick2017.3. (SRA: SRX8752791, SRA: SRX8755296, SRA: SRX8755297, SRA: SRX8755298, SRA: SRX8755299, SRA: SRX8755300, SRA: SRX8755301, SRA: SRX8755302, SRA: SRX8755303, SRA: SRX8755304, SRA: SRX8752789, SRA: SRX8752790, SRA: SRX8752792, SRA: SRX8752793, SRA: SRX8752794, go to GenBank)

Mp_2718_Mnev_isolate_1. (ND1: GU085356, go to GenBank)

Mp_2718_Mnev_isolate_2. (ND1: GU085357, go to GenBank)

NCSM_35123. (SRA: SRX13980292, go to GenBank)

Z_12423 (2015-0501). (16S: MK001794, 28S: MK001828, COI: MF960128, go to GenBank)