Texas is home to just under 50 extant freshwater mussel species. The conservation status of these species varies from species that are quite rare and now candidates for federal listing to ones that are quite common. The table below details the status of each mussel species recorded from Texas in terms of their state and federal status, as well as their state rank.


State ranks are designated by a number from one to five, preceded by a letter reflecting the appropriate geographic scale (S=State). Numbers have the following meaning: 1) Critically imperiled, 2) Imperiled, 3) Vulnerable, 4) Apparently secure, and 5) Secure. Other rank combinations have the following meanings: SH, species possibly extinct and known only from historical occurrences, SNA, species is not a suitable target for conservation activities, and SX, species is presumed to be extirpated from state.


Bold state ranks denote a species tracked by Texas Parks and Wildlife Department's Texas Natural Diversity Database (TXNDD).



Species

State Rank

State Status

Federal Status

Threeridge
Amblema plicata


S4

 

 

Flat Floater
Anondonta suborbiculata


S3

 

 

Rock Pocketbook
Arcidens confragosus


S3

   

Ouachita Rock-Pocketbook
Arkansia wheeleri


SH

 

Endangered

Tampico Pearlymussel
Cyrtonaias tampicoensis


S4

   

Spike
Elliptio dilatata


SNA

   

Texas Pigtoe
Fusconaia askewi


S2S3

Threatened

 

Wabash Pigtoe
Fusconaia flava


S1S2

   

Triangle Pigtoe
Fusconaia lananensis


S1

Threatened

 

Round Pearlshell
Glebula rotundata


S3

   

Texas Fatmucket
Lampsilis bracteata


S1

Threatened

Candidate

Louisiana Fatmucket
Lampsilis hydiana


S4

   

Sandbank Pocketbook
Lampsilis satura


S1

Threatened

 

Yellow Sandshell
Lampsilis teres


S4

   

White Heelsplitter
Lasmigona complanata


S1

   

Fragile Papershell
Leptodea fragilis


S4

   

Pond Mussel
Ligumia subrostrata


S4

   

Washboard
Megalonaias nervosa


S3

   

Threehorn Wartyback
Obliquaria reflexa


S4

   

Southern Hickorynut
Obovaria jacksonaia


S1

Threatened

 

Bankclimber
Plectomerus dombeyanus


S4

   

Louisiana Pigtoe
Pleurobema riddellii


S1

Threatened

 

Texas Hornshell
Popenaias popeii


S1

Threatened

Candidate

Texas Heelsplitter
Potamilus amphichaenus


S1

Threatened

 

Salina Mucket
Potamilus metnecktayi


S1

Threatened

 

Pink Papershell

Potamilus ohiensis


S4

   

Bleufer
Potamilus purpuratus


S4

   

Giant Floater
Pyganodon grandis


S4

   

Southern Mapleleaf
Quadrula apiculata


S4

   

Golden Orb
Quadrula aurea


S2

Threatened

Candidate

Rio Grande Monkeyface
Quadrula couchiana


SX

   

Smooth Pimpleback
Quadrula houstonensis


S1S2

Threatened

Candidate

False Spike
Quadrula mitchelli


S1

Threatened

 

Western Pimpleback
Quadrula mortoni


S4

   

Gulf Mapleleaf
Quadrula nobilis


S3

   

Wartyback
Quadrula nodulata


S2

   

Texas Pimpleback
Quadrula petrina


S1

Threatened

Candidate

Pimpleback
Quadrula pustulosa


S1

   

Mapleleaf
Quadrula quadrula


S3

   

Pistolgrip
Quadrula verrucosa


S3S4

   

Creeper
Strophitus undulatus


S1

   

Lilliput
Toxolasma parvum


S3

   

Texas Lilliput
Toxolasma texasense


S4

   

Mexican Fawnsfoot
Truncilla cognata


S1

Threatened

 

Fawnsfoot
Truncilla donaciformis


S2

   

Texas Fawnsfoot
Truncilla macrodon


S1

Threatened

Candidate

Deertoe
Truncilla truncata


S3

   

Tapered Pondhorn
Uniomerus declivis


S3

   

Pondhorn
Uniomerus tetralasmus


S3

   

Paper Pondshell
Utterbackia imbecillis


S4

   

Little Spectaclecase
Villosa lienosa


S1S2

   


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