ARKive's most wanted species listed alphabetically by scientific name
| Scientific name | Common name | Status |
|---|---|---|
| Ternstroemia subsessilis | CR | |
| Ternstroemia wallichiana | VU | |
| Terua vallicola | CR | |
| Tessmannia densiflora | EN | |
| Testulea gabonensis | EN | |
| Tetradactylus breyeri | Breyer's Long-tailed Seps | VU |
| Tetradactylus eastwoodae | Eastwood's Whip Lizard | EX |
| Tetradoxa omeiensis | EN | |
| Tetragastris tomentosa | VU | |
| Tetramorium microgyna | VU | |
| Tetramorium parasiticum | VU | |
| Tetraodon baileyi | Ragged puffer | VU |
| Tetraodon cambodgiensis | VU | |
| Tetraodon pustulatus | Puffer fish | VU |
| Tetrapanax tibetanus | VU | |
| Tetraplasandra gymnocarpa | Koolau Tetraplasandra | CR |
| Tetrataxis salicifolia | CR | |
| Tetrathemis yerburii | EN | |
| Tetrix sierrane | Sierra Pygmy Grasshopper | VU |
| Tetrorchidium microphyllum | CR | |
| Tetrorchidium ulugurense | VU | |
| Tettigidea empedonepia | Torreya Pygmy Grasshopper | CR |
| Teucrium abutiloides | CR | |
| Teucrium lepicephalum | EN | |
| Teucrium turredanum | VU | |
| Thaksinthelphusa yongchindaratae | EN | |
| Thalassoma robertsoni | VU | |
| Thalassoma virens | Emerald wrasse | VU |
| Thalia pavonii | VU | |
| Thalurania ridgwayi | Mexican Woodnymph | VU |
| Thamnomys kempi | Kemp's Thicket Rat | VU |
| Thamnomys venustus | Charming Thicket Rat | VU |
| Thamnophis melanogaster | EN | |
| Thamnophis mendax | EN | |
| Thamnosophis martae | EN | |
| Thamnosophis stumpffi | Yellow-striped Water Snake | VU |
| Thapsia buraensis | EN | |
| Thapsia snelli | EN | |
| Thaumatodon hystricelloides | EN | |
| Thaumatodon multilamellata | EX | |
| Thaumatogryllus cavicola | Volcanoes Cave Cricket | VU |
| Thaumatogryllus variegatus | Kauai Thin-footed Bush Cricket | VU |
| Theba grasseti | EN | |
| Thecacoris annobonae | EN | |
| Theliderma intermedia | Cumberland Monkeyface | CR |
| Theliderma sparsa | Appalachian Monkeyface | CR |
| Theliderma stapes | Stirrupshell | CR |
| Theliderma tuberosa | CR | |
| Theloderma bicolor | Chapa Bug-eyed Frog | EN |
| Theloderma moloch | VU |