U.S. Listed Birds ^
SW --- E --- Bobwhite, masked (quail) (Colinus virginianus ridgwayi)
SW --- E --- Crane, whooping * (Grus americana)
SW --- E --- Falcon, northern aplomado * (Falco femoralis septentrionalis)
SW --- E --- Flycatcher, Southwestern willow * (Empidonax traillii extimus)
SW --- T --- Owl, Mexican spotted * (Strix occidentalis lucida)
SW --- E --- Prairie-chicken, Attwater's greater * (Tympanuchus cupido attwateri)
SW --- E --- Pygmy-owl, cactus ferruginous * (Glaucidium brasilianum cactorum)
SW --- E --- Rail, Yuma clapper * (Rallus longirostris yumanensis)
SW --- E --- Vireo, black-capped * (Vireo atricapillus)
SW --- E --- Warbler, golden-cheeked * (Dendroica chrysoparia)

U.S. Listed Reptiles ^
SW --- T --- Rattlesnake, New Mexican ridge-nosed (Crotalus willardi obscurus)
SW --- E --- Sea turtle, Kemp's (=Atlantic) ridley * (Lepidochelys kempii)
SW --- T --- Snake, Concho water * (Nerodia paucimaculata)

U.S. Listed Amphibians ^
SW --- E --- Salamander, Barton Springs * (Eurycea sosorum)
SW --- T --- Salamander, San Marcos * (Eurycea nana)
SW --- E --- Salamander, Sonoran tiger * (Ambystoma tigrinum stebbinsi)
SW --- E --- Salamander, Texas blind * (Typhlomolge rathbuni)
SW --- E --- Toad, Houston * (Bufo houstonensis)

U.S. Listed Fishes ^
SW --- T --- Catfish, Yaqui * (Ictalurus pricei)
SW --- T --- Chub, Chihuahua * (Gila nigrescens)
SW --- T --- Chub, Sonora (Gila ditaenia)
SW --- E --- Chub, Yaqui * (Gila purpurea)
SW --- E --- Darter, fountain * (Etheostoma fonticola)
SW --- T --- Darter, leopard * (Percina pantherina)
SW --- E --- Gambusia, Big Bend * (Gambusia gaigei)
SW --- E --- Gambusia, Clear Creek * (Gambusia heterochir)
SW --- E --- Gambusia, Pecos * (Gambusia nobilis)
SW --- E --- Gambusia, San Marcos * (Gambusia georgei)
SW --- T --- Minnow, loach (Rhinichthys (=Tiaroga) cobitis)
SW --- E --- Minnow, Rio Grande silvery * (Hybognathus amarus)
SW --- E --- Pupfish, Comanche Springs * (Cyprinodon elegans)
SW --- E --- Pupfish, desert (Cyprinodon macularius)
SW --- E --- Pupfish, Leon Springs * (Cyprinodon bovinus)
SW --- T --- Shiner, Arkansas River (native pop. only) * (Notropis girardi)
SW --- T --- Shiner, beautiful * (Cyprinella (=Notropis) formosa)
SW --- T --- Shiner, Pecos bluntnose (Notropis simus pecosensis)
SW --- T --- Spikedace * (Meda fulgida)
SW --- T --- Spinedace, Little Colorado * (Lepidomeda vittata)
SW --- E --- Topminnow, Gila (incl. Yaqui) * (Poeciliopsis occidentalis)
SW --- T --- Trout, Apache (=Arizona) * (Oncorhynchus (=Salmo) apache)
SW --- E --- Trout, Gila * (Oncorhynchus (=Salmo) gilae)

U.S. Listed Clams ^
SW --- E --- Pocketbook, Ouachita rock (=Wheeler's pearly mussel) * (Arkansia wheeleri)

U.S. Listed Snails ^
SW --- E --- Springsnail, Alamosa (Tryonia alamosae)
SW --- E --- Springsnail, Socorro * (Pyrgulopsis neomexicana)

U.S. Listed Insects ^
SW --- E --- Beetle, Coffin Cave mold (Batrisodes texanus)
SW --- E --- Beetle, Comal Springs riffle * (Heterelmis comalensis)
SW --- E --- Beetle, Comal Springs dryopid * (Stygoparnus comalensis)
SW --- E --- Beetle, Kretschmarr Cave mold (Texamaurops reddelli)
SW --- E --- Beetle, Tooth Cave ground (Rhadine persephone)

U.S. Listed Arachnids ^
SW --- E --- Harvestman, Bee Creek Cave (Texella reddelli)
SW --- E --- Harvestman, Bone Cave (Texella reyesi)
SW --- E --- Pseudoscorpion, Tooth Cave * (Tartarocreagris (=Microcreagris) texana)
SW --- E --- Spider, Tooth Cave * (Neoleptoneta (=Leptoneta) myopica)

U.S. Listed Crustaceans ^
SW --- E --- Amphipod, Peck's cave * (Stygobromus (=Stygonectes) pecki )
SW --- E --- Isopod, Socorro * (Thermosphaeroma (=Exosphaeroma) thermophilus)

U.S. Listed Flowering Plants ^
SW --- E --- Large-fruited sand-verbena * (Abronia macrocarpa)
SW --- E --- Arizona agave (Agave arizonica)
SW --- E --- South Texas ambrosia * (Ambrosia cheiranthifolia)
SW --- E --- Kearney's blue-star (Amsonia kearneyana)
SW --- E --- Tobusch fishhook cactus * (Ancistrocactus tobuschii)
SW --- E --- Sacramento prickly-poppy (Argemone pleiacantha ssp. pinnatisecta)
SW --- E --- Sentry milk-vetch (Astragalus cremnophylax var. cremnophylax)
SW --- E --- Mancos milk-vetch (Astragalus humillimus)
SW --- E --- Star cactus * (Astrophytum asterias)
SW --- E --- Texas ayenia * (Ayenia limitaris)
SW --- E --- Texas poppy-mallow (Callirhoe scabriuscula)
SW --- T --- Navajo sedge (Carex specuicola)
SW --- T --- Sacramento Mountains thistle (Cirsium vinaceum)
SW --- E --- Nellie cory cactus * (Coryphantha (=Escobaria) minima)
SW --- T --- Bunched cory cactus * (Coryphantha ramillosa)
SW --- T --- Cochise pincushion cactus (Coryphantha (=Escobaria) robbinsorum)
SW --- E --- Pima pineapple cactus (Coryphantha scheeri var. robustispina)
SW --- T --- Lee pincushion cactus (Coryphantha sneedii var. leei)
SW --- E --- Sneed pincushion cactus * (Coryphantha sneedii var. sneedii)
SW --- E --- Terlingua Creek cats-eye (Cryptantha crassipes)
SW --- E --- Nichol's Turk's head cactus (Echinocactus horizonthalonius var. nicholii)
SW --- T --- Chisos Mountain hedgehog cactus * (Echinocereus chisoensis var. chisoensis)
SW --- E --- Kuenzler hedgehog cactus (Echinocereus fendleri var. kuenzleri)
SW --- E --- Lloyd's hedgehog cactus * (Echinocereus lloydii)
SW --- E --- Black lace cactus (Echinocereus reichenbachii (=melanocentrus) var. albertii)
SW --- E --- Arizona hedgehog cactus (Echinocereus triglochidiatus var. arizonicus)
SW --- E --- Davis' green pitaya * (Echinocereus viridiflorus var. davisii)
SW --- T --- Lloyd's Mariposa cactus (Echinomastus (=Sclerocactus) mariposensis)
SW --- T --- Zuni (=rhizome) fleabane (Erigeron rhizomatus)
SW --- T --- Gypsum wild-buckwheat (Eriogonum gypsophilum)
SW --- E --- Johnston's frankenia (Frankenia johnstonii)
SW --- E --- Todsen's pennyroyal (Hedeoma todsenii)
SW --- E --- Slender rush-pea * (Hoffmannseggia tenella)
SW --- E --- Texas prairie dawn-flower (=Texas bitterweed) (Hymenoxys texana)
SW --- E --- Holy Ghost ipomopsis (Ipomopsis sancti-spiritus)
SW --- E --- White bladderpod (Lesquerella pallida)
SW --- E --- Huachuca water-umbel (Lilaeopsis schaffneriana ssp. recurva)
SW --- E --- Walker's manioc (Manihot walkerae)
SW --- E --- Brady pincushion cactus (Pediocactus bradyi)
SW --- E --- Knowlton cactus * (Pediocactus knowltonii)
SW --- E --- Peebles Navajo cactus (Pediocactus peeblesianus var. peeblesianus)
SW --- T --- Siler pincushion cactus (Pediocactus sileri)
SW --- E --- Texas trailing phlox (Phlox nivalis ssp. texensis)
SW --- E --- Little Aguja pondweed (Potamogeton clystocarpus)
SW --- E --- Arizona cliffrose (Purshia subintegra)
SW --- T --- Hinckley's oak * (Quercus hinckleyi)
SW --- T --- Mesa Verde cactus * (Sclerocactus mesae-verdae)
SW --- T --- San Francisco Peaks groundsel (Senecio franciscanus)
SW --- E --- Canelo Hills ladies'-tresses (Spiranthes delitescens)
SW --- E --- Navasota ladies'-tresses * (Spiranthes parksii)
SW --- E --- Texas snowbells * (Styrax texanus)
SW --- E --- Ashy dogweed (Thymophylla tephroleuca)
SW --- E --- Texas wild-rice (Zizania texana)
 

While this is just a long list, the USFW has more details on many of the species listed here, and I reccommend you check them out.