Species of Greatest Conservation Need

1124 species
Taxonomic Group
Federal Status
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Species of Greatest Conservation Need (Updated: 06/16/2025)
Scientifc Name Common Name Taxonomic Group SGCN Status Federal Status State Status Global Rank State Rank Endemic General Habitat Type(s)
Tryonia brunei Brune's tryonia Invertebrates Yes Not Listed Not Listed G1 S1 Yes Endemic freshwater snail; benthic; currently only found in modified waters Phantom Lake Spring; abundant on firm substratum and in soft mud before modification; vulnerable to declining groundwater resulting in reduction of springflow
Tryonia cheatumi Phantom tryonia Invertebrates Yes E
08/08/2013		 E
03/23/2015		 G1 S1 Yes Endemic aquatic snail; known only from three spring systems and associated outflows in Jeff Davis and Reeves counties; vulnerable to reduction of springflow resulting from declining levels of groundwater
Tryonia circumstriata Gonzales tryonia Invertebrates Yes E
08/08/2013		 E
03/23/2015		 G1 S1 Yes Endemic; aquatic snail only known from a spring system and associated outflows in Pecos County; mud substrates on the margins of small springs and seeps, and marshes in flowing water associated with sedges and cattails; presumed to be fine particle feeders of detritus and periphyton within substrate
Tryonia metcalfi Metcalf's tryonia Invertebrates Yes Not Listed T
03/27/2020		 G1 SNR Yes Locality is a complex of small seeps that discharges into a broad arroyo. This species was found on mud, decaying vegetation, and on the undersides of rocks in water.
Tryonia oasiensis Carolinae tryonia Invertebrates Yes Not Listed T
03/27/2020		 G1 SNR Yes Endemic to a single site in the lower Pecos River basin. Found in a complex of large springs, which is also known as T5 Springs, and discharges into two large ponds. Found in low abundance in silt along the edges of a short (ca. 5 m) reach of the outflow of the lower pond.
Tyrannochthonius troglodytes No accepted common name Invertebrates Yes Not Listed Not Listed G1G2 S1 Yes Habitat description is not available at this time.
Uniomerus declivis tapered pondhorn Invertebrates Yes Not Listed Not Listed G5 SNR No It likely occurs in streams, rivers, oxbows, marshes, swamps, lakes, canals, ponds, and reservoirs in still to moderate currents in mud, sand, or gravel substrates. Also probably occurs in woody debris such as logjams and exposed roots of riparian trees (Williams et al. 2008).
Vaejovis chisos No accepted common name Invertebrates Yes Not Listed Not Listed GNR S3 Yes Specimens were collected in thickly wooded areas with substantial ground cover (i.e. decayed leaves, plant cover), mainly from the banks and slopes assocaited with trail cuts. These areas were moister than adjoining slopes where the species was not found.
Xiphocentron messapus No accepted common name Invertebrates Yes Not Listed Not Listed G1G3 S2? Yes Habitat description is not available at this time.
Antilocapra americana pronghorn Mammals Yes Not Listed Not Listed G5 S3 No Prefers hilly and plateau areas of open grassland, desert-grassland, and desert-scrub, where it frequents south-facing slopes and other sheltered areas.
Bison bison bison Mammals Yes Not Listed Not Listed G4 SH No Habitat description is not available at this time.
Blarina hylophaga hylophaga Elliot's short-tailed shrew Mammals Yes Not Listed Not Listed G5T1Q S1 No Habitat description is not available at this time.
Blarina hylophaga plumbea Aransas short-tailed shrew Mammals Yes Not Listed Not Listed G5T1Q S1 Yes Excavates burrows in sandy soils underlying mottes of live oak trees or in areas with little to no ground cover.
Corynorhinus rafinesquii Rafinesque's big-eared bat Mammals Yes Not Listed T
07/18/1977		 G3G4 S2 No Historically, lowland pine and hardwood forests with large hollow trees. roosts in cavity trees of bottomland hardwoods, concrete culverts, and abandoned man-made structures
Corynorhinus townsendii Townsend's big-eared bat Mammals Yes Not Listed Not Listed G4 S3? No In Texas, habitat ranges from desert scrub to pinyon-juniper woodland, consistently in areas with canyons or cliffs (Schmidly 1991). Roosts in caves, crevases, trees, and buildings in the Panhandle and Trans-Pecos.
Corynorhinus townsendii pallescens pale Townsend's big-eared bat Mammals Yes Not Listed Not Listed G4T3T4 S3? No Habitat description is not available at this time.
Cynomys ludovicianus black-tailed prairie dog Mammals Yes Not Listed Not Listed G4 S3 No Dry, flat, short grasslands with low, relatively sparse vegetation, including areas overgrazed by cattle; live in large family groups
Dipodomys compactus compactus Padre Island kangaroo rat Mammals Yes Not Listed Not Listed G4T3 S3 Yes Dunes and open sandy areas near the coast.
Dipodomys elator Texas kangaroo rat Mammals Yes PE
08/17/2023		 T
07/18/1977		 G2 S1 No Sandy loam surface soils containing some clay and which supports short grasses (buffalo grass) and small to medium sized mesquite; mesquite not required, but mostly in association with scattered mesquite shrubs and sparse, short grasses in areas underlain by firm clay soils; along fencerows adjacent to cultivated fields/roads; burrows into soil with openings usually at base of mesquite or shrub; active throughout year; nocturnal; feeds on grass seeds, insects, and annual and perennial forbs; metabolizes water from foods, but will drink water when available; young born in underground nest chamber.
Euderma maculatum spotted bat Mammals Yes Not Listed T
07/18/1977		 G4 S3 No Ponderosa pine forests to desert scrub; habitat requirement appears to be limited to presence of broken canyon country or cliffs for roosting sites; in Texas, Big Bend region; preferred habitat not fully understood, but species reported from pine forests at high elevations to open, desert scrub; reproduction data sparse, but single offspring born June-July
Eumops perotis western mastiff bat Mammals Yes Not Listed Not Listed G4G5 S3 No Undisturbed rock crevices are essential to successful breeding. Ssp. californicus - arid canyons; roosts in crevices in rock walls of desert canyons, old buildings, hollow trees; roost site must have clearance for a three meter fall by exiting bats
Eumops perotis californicus greater western mastiff bat Mammals Yes Not Listed Not Listed G4G5T4 S3 No Arid canyons; roosts in crevices in rock walls of desert canyons, old buildings, hollow trees; roost site must have clearance for a three meter fall by exiting bats; colony size varies from several individuals to several dozen; males and females may remain together throughout the year; single offspring (occasionally twins) born June-July.
Geomys arenarius desert pocket gopher Mammals Yes Not Listed Not Listed G3G4 S2 No Cottonwood-willow association along the Rio Grande in El Paso and Hudspeth counties; does not tolerate clayey or gravelly soils characteristic of the other Geomys species; common along irrigation ditches in the sandy river bottom area.Lives underground, but build large and conspicuous mounds; life history not well documented, but presumed to eat mostly vegetation, be active year round, and bear more than one litter per year.
Geomys knoxjonesi Jones's pocket gopher Mammals Yes Not Listed Not Listed G3Q S2 No This fossorial rodent is restricted to areas with deep, sandy, aeolian soils; usually in native yucca-grassland habitat, although it is also found on grassy roadsides, pastures, and lawns (Bradley and Baker, in Wilson and Ruff 1999).
Geomys personatus davisi Davis pocket gopher Mammals Yes Not Listed Not Listed G4T2 S2 Yes Burrows in sandy soils in southern Texas