Species of Greatest Conservation Need
1124 species
| Scientifc Name | Common Name | Taxonomic Group | Federal Status | State Status | Global Rank | State Rank | Endemic |
|---|---|---|---|---|---|---|---|
| Rhadine speca gentilis | No accepted common name | Invertebrates | Not Listed | Not Listed | G2T1 | S1 | Not Evaluated |
| Rhadine speca speca | No accepted common name | Invertebrates | Not Listed | Not Listed | G2T1 | S1 | Not Evaluated |
| Rhadine subterranea | No accepted common name | Invertebrates | Not Listed | Not Listed | G2 | S2 | Yes |
| Rhadine tenebrosa | No accepted common name | Invertebrates | Not Listed | Not Listed | G1G2 | S1S2 | Yes |
| Sagittunio subrostratus | pondmussel | Invertebrates | Not Listed | Not Listed | G5 | S4 | No |
| Salimuzzamania howdeni | No accepted common name | Invertebrates | Not Listed | Not Listed | GNR | S1 | Yes |
| Satyrium polingi | Poling's hairstreak | Invertebrates | Not Listed | Not Listed | G3 | S1 | No |
| Schistocerca camerata | No accepted common name | Invertebrates | Not Listed | Not Listed | GNR | S1 | Not Evaluated |
| Seborgia hershleri | No accepted common name | Invertebrates | Not Listed | Not Listed | G1G2 | S2 | Yes |
| Somatochlora margarita | Texas emerald dragonfly | Invertebrates | Not Listed | Not Listed | G2G3 | S2 | No |
| Sonorella huecoensis | Huecos Mountains talus snail | Invertebrates | Not Listed | Not Listed | G1G2 | S1 | Yes |
| Sonorella metcalfi | Franklin Mountain talus snail | Invertebrates | Not Listed | Not Listed | G2 | S2 | No |
| Sparbarus coushatta | No accepted common name | Invertebrates | Not Listed | Not Listed | G1G2 | SNR | Not Evaluated |
| Spectralia prosternalis | No accepted common name | Invertebrates | Not Listed | Not Listed | GNR | S2 | Yes |
| Speocirolana hardeni | No accepted common name | Invertebrates | Not Listed | Not Listed | G2G3 | S2 | No |
| Speodesmus falcatus | sickled cave millipede | Invertebrates | Not Listed | Not Listed | GNR | S1 | Yes |
| Speodesmus ivyi | Ivy's cave millipede | Invertebrates | Not Listed | Not Listed | GNR | S2 | Yes |
| Speodesmus reddelli | Reddell's cave millipede | Invertebrates | Not Listed | Not Listed | GNR | S2 | Yes |
| Sphalloplana mohri | No accepted common name | Invertebrates | Not Listed | Not Listed | G3G4 | S3 | Yes |
| Sphingicampa blanchardi | No accepted common name | Invertebrates | Not Listed | Not Listed | G1 | S1 | Probable |
| Stallingsia maculosus | Manfreda giant-skipper | Invertebrates | Not Listed | Not Listed | G1 | S1 | No |
| Streptocephalus mattoxi | crenatethumb fairy shrimp | Invertebrates | Not Listed | Not Listed | G1 | S1 | Yes |
| Strophitus undulatus | creeper | Invertebrates | Not Listed | Not Listed | G5 | S1 | No |
| Stygobromus alabamensis | No accepted common name | Invertebrates | Not Listed | Not Listed | G5 | S1 | No |
| Stygobromus balconis | Balcones Cave amphipod | Invertebrates | Not Listed | Not Listed | G2G3 | S2 | Yes |