Species of Greatest Conservation Need

1279 species
Taxonomic Group
Federal Status
State Status
Endemic

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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 Perdita tricincta Invertebrates Not Listed Not Listed GNR SNR False Grassland, Shrubland
No Accepted Common Name Petrophila daemonalis Invertebrates Not Listed Not Listed GNR SNR False Grassland, Shrubland
Salt Playa Fairy Shrimp Phallocryptus sublettei Invertebrates Not Listed Not Listed G2 S3 False Saline playa lakes ranging from a few meters to a kilometer in diameter; usually very shallow with depth of water a function of rainfall, humidity, and basin structure; dry during summer and filling with fall rains (Rogers, 2003; Lang and Rogers, 2002).
No Accepted Common Name Phoenicobiella schwarzii Invertebrates Not Listed Not Listed GNR S2 False Forest, Woodland
No Accepted Common Name Phreatodrobia conica Invertebrates Not Listed Not Listed G1 S2 True Caves/Karst
crowned cavesnail Phreatodrobia coronae Invertebrates Not Listed T G1G2 S2 True Caves/Karst
mimic cavesnail Phreatodrobia imitata Invertebrates Not Listed Not Listed G1 S1 True Subaquatic; only known from two wells penetrating the Edwards Aquifer
No Accepted Common Name Phreatodrobia micra Invertebrates Not Listed Not Listed G2G3 S2 True Caves/Karst
No Accepted Common Name Phreatodrobia plana Invertebrates Not Listed Not Listed G2 S2 True Caves/Karst
No Accepted Common Name Phreatodrobia punctata Invertebrates Not Listed Not Listed G2 S1 True Caves/Karst
No Accepted Common Name Phreatodrobia rotunda Invertebrates Not Listed Not Listed G1G2 S2 True Caves/Karst
No Accepted Common Name Phylocentropus harrisi Invertebrates Not Listed Not Listed G1G2 S1 False Lotic systems, but specifics unknown
Chisos skipperling Piruna haferniki Invertebrates Not Listed Not Listed G2G3 S1? False Open oak/pine woodland, thorn scrub below oak zone, nectarivore/herbivore, adults in genus nectar and drink from damp soil; larva of subfamily feed on grasses or sedges, some very specialized, caterpillars of other Piruna eat leaves of broad-leaved grasses, including grama grass Bouteloua; diurnal, hibernates/aestivates; adults fly from March to possibly October
No Accepted Common Name Platyomus flexicaulis Invertebrates Not Listed Not Listed GNR SNR False Forest, Woodland
No Accepted Common Name Plauditus texanus Invertebrates Not Listed Not Listed G2G3 S1? False Larvae are associated with small to medium limestone cobble and macrophytes in shallow riffles of clear, cool, alkaline streams (P. McCafferty, personal communication, December 2003).
Louisiana pigtoe Pleurobema riddellii Invertebrates Not Listed T G1G2 S1 False Occurs in small streams to large rivers in slow to moderate currents in substrates of clay, mud, sand, and gravel. Not known from impoundments (Howells 2010f; Randklev et al. 2013b; Troia et al. 2015). [Mussels of Texas 2019]
No Accepted Common Name Pogonomyrmex bigbendensis Invertebrates Not Listed Not Listed GNR SNR False Barren/Sparse Vegetation
Comanche harvester ant Pogonomyrmex comanche Invertebrates Not Listed Not Listed G2G3 S2 True Barren/Sparse Vegetation
Monahans lined june beetle Polyphylla monahansensis Invertebrates Not Listed Not Listed GNR S2 False Barren/Sparse Vegetation
No Accepted Common Name Polyphylla pottsorum Invertebrates Not Listed Not Listed GNR S1 False Barren/Sparse Vegetation
Texas hornshell Popenaias popeii Invertebrates LE E G1 S1 False Occurs in small streams to large rivers in slow to moderate current, often residing in rock crevices, travertine shelves, and under large boulders, where small-grained material, such as clay, silt, or sand gathers. Can also occur in riffles that are clean swept of soft silt; not known from reservoirs (Carman 2007; Inoue et al. 2014; Randklev et al. 2017b; Randklev et al. forthcoming). [Mussels of Texas 2019]
Texas heelsplitter Potamilus amphichaenus Invertebrates Not Listed T G1G3 S1 False Occurs in small streams to large rivers in standing to slow-flowing water; most common in banks, backwaters and quiet pools; adapts to some reservoirs. Often found in soft substrates such as mud, silt or sand (Howells et al. 1996; Randklev et al. 2017a). [Mussels of Texas 2019]
Salina mucket Potamilus metnecktayi Invertebrates Not Listed T G1 S1 False Occurs in medium to large rivers, where it may be found in substrates composed of various combinations of mud, sand, gravel, and cobble, as well as under rocks. It occurs in areas with slow to moderate current, most often in stable littoral habitats dominated by boulder or bedrock habitat; not known from reservoirs (Randklev et al. 2017b; Randklev et al. forthcoming). [Mussels of Texas 2019]
Brazos heelsplitter Potamilus streckersoni Invertebrates Not Listed T GNR SNR True Reported from streams, but not far into the headwaters, to large rivers, and some reservoirs. In riverine systems occurs most often in nearshore habitats such as banks and backwater pools but occasionally in mainchannel habitats such as riffles. Typically found in standing to slow-flowing water in soft substrates consisting of silt, mud or sand but occasionally in moderate flows with gravel and cobble substrates (Randklev et al. 2014b,c; Tsakiris and Randklev 2016b; Smith et al. 2019) [Mussels of Texas 2020]
No Accepted Common Name Praticolella candida Invertebrates Not Listed Not Listed G2 S2 True Woodland