Nongame and Rare Species Program: Freshwater Mussels of Texas

Conservation Status of Texas Freshwater Mussels

Texas is home to just under 50 extant freshwater mussel species. The conservation status of these species vary 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	TPWD 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