Species of Greatest Conservation Need

1279 species
Taxonomic Group
Federal Status
State Status
Endemic

Export results as CSV

Species of Greatest Conservation Need (Updated: 01/31/2024)
Common Name Scientifc Name Taxonomic Group Federal Status State Status Global Rank State Rank Endemic General Habitat Type(s)
No Accepted Common Name Toramus chamaeropis Invertebrates Not Listed Not Listed GNR SNR False Forest, Woodland
No Accepted Common Name Tortopus circumfluus Invertebrates Not Listed Not Listed G1G3 S2? True Mayflies distinguished by aquatic larval stage; adult stage generally found in shoreline vegetation
No Accepted Common Name Trichodesma pulchella Invertebrates Not Listed Not Listed GNR S1 False Forest, Woodland
No Accepted Common Name Trichodesma sordida Invertebrates Not Listed Not Listed GNR SNR False Forest, Woodland
No Accepted Common Name Tricorythodes curvatus Invertebrates Not Listed Not Listed G1G3 S2? False AR, OK, TX; mayflies distinguished by aquatic larval stage; adult stage generally found in bankside vegetation
No Accepted Common Name Trigonogya reticulaticollis Invertebrates Not Listed Not Listed GNR S1 True Forest, Woodland
No Accepted Common Name Trigonoscutoides texanus Invertebrates Not Listed Not Listed GNR S2 True This species is associated with early seral sand dune habitats found in the Permian Basin
gulf dune grasshopper Trimerotropis schaefferi Invertebrates Not Listed Not Listed G2G3 S4 False Coastal dunes and areas behind the dunes.
Mexican fawnsfoot Truncilla cognata Invertebrates Not Listed T G1 S1 False Occurs in large rivers but may also be found in medium-sized streams. Is commonly found in habitats with some flowing water, often in protected near shore areas such as banks and backwaters but also at the head of riffles; the latter more often supporting both sub-adults and adults. Typically occurs in substrates of mixed sand and gravel as well as soft unconsolidated sediments. Considered intolerant of reservoirs (Randklev et al. 2017b; Randklev et al. forthcoming). [Mussels of Texas 2019]
Texas fawnsfoot Truncilla macrodon Invertebrates PT T G1 S2 True Occurs in large rivers but may also be found in medium-sized streams. Is found in protected near shore areas such as banks and backwaters but also riffles and point bar habitats with low to moderate water velocities. Typically occurs in substrates of mud, sandy mud, gravel and cobble. Considered intolerant of reservoirs (Randklev et al. 2010; Howells 2010o; Randklev et al. 2014b,c; Randklev et al. 2017a,b). [Mussels of Texas 2019]
Brune's tryonia Tryonia brunei Invertebrates Not Listed Not Listed G1 S1 True 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
Phantom tryonia Tryonia cheatumi Invertebrates LE E G1 S1 True 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
Gonzales tryonia Tryonia circumstriata Invertebrates LE E G1 S1 True 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
Metcalf's tryonia Tryonia metcalfi Invertebrates Not Listed T G1 SNR True 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.
Carolinae tryonia Tryonia oasiensis Invertebrates Not Listed T G1 SNR True 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.
No Accepted Common Name Typhloelmis caroline Invertebrates Not Listed Not Listed GNR SNR True Spring obligate. Known only from Caroline Springs in Terrell County. Fine scale habitat requirements unknown.
No Accepted Common Name Typhloelmis finegan Invertebrates Not Listed Not Listed GNR SNR True Spring obligate. Known only from Finegan Springs, Val Verde County. Fine scale habitat requirements unknown.
No Accepted Common Name Typhloelmis sanfelipe Invertebrates Not Listed Not Listed GNR SNR True Spring obligate. Known only from San Felipe Springs, Val Verde County. Fine scale habitat requirements unknown.
No Accepted Common Name Tyrannochthonius muchmoreorum Invertebrates Not Listed Not Listed GNR SNR False Caves/Karst
No Accepted Common Name Tyrannochthonius troglodytes Invertebrates Not Listed Not Listed G1G2 S1 True Caves/Karst
No Accepted Common Name Vaejovis chisos Invertebrates Not Listed Not Listed GNR S3 True 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.
No Accepted Common Name Xiphocentron messapus Invertebrates Not Listed Not Listed G1G3 S2? True Riparian, Riverine
pronghorn Antilocapra americana Mammals Not Listed Not Listed G5 S3 False 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 Not Listed Not Listed G4 SH False Grassland; shortgrass prairie, tall grass prairie; large expanses of intact prairie grasslands which would allow long-distance migration in response to seasonal snowfall or drought and would support key sympatric species (e.g. prairie dogs and the other species reliant on prairie dog towns)
Aransas short-tailed shrew Blarina hylophaga plumbea Mammals Not Listed Not Listed G5T1Q S1 True Excavates burrows in sandy soils underlying mottes of live oak trees or in areas with little to no ground cover.