ARKive's most wanted species listed alphabetically by scientific name
| Scientific name | Common name | Status |
|---|---|---|
| Atelopus tamaense | Tamá Harlequin Frog | CR |
| Atelopus vogli | EX | |
| Atelopus walkeri | CR | |
| Athamanta cortiana | CR | |
| Athearnia anthonyi | Anthony's River Snail | VU |
| Athearnia crassa | Boulder Snail | EX |
| Atherinella jiloaensis | CR | |
| Atherinomorus lineatus | Lined Silverside | VU |
| Atheris barbouri | Uzungwe Mountain Bush Viper | VU |
| Atkinsia cubensis | EN | |
| Atlantasellus cavernicolus | CR | |
| Atlantisia elpenor | Ascension flightless crake | EX |
| Atlantisia podarces | St Helena Crake | EX |
| Atlapetes blancae | Antioquia Brush-Finch | CR |
| Atractocarpus platyxylon | VU | |
| Atractus modestus | Modest Ground Snake | VU |
| Atractus nicefori | Northern Ground Snake | VU |
| Atractus roulei | Roule's Ground Snake | VU |
| Atractylis arbuscula | EN | |
| Atractylis preauxiana | EN | |
| Atraphaxis muschketowi | Shrubby Buckwheat | EN |
| Atrichornis clamosus | Western Scrubird | VU |
| Atriplex plebeja | CR | |
| Atrophaneura atropos | VU | |
| Atrophaneura jophon | Sri Lankan Rose | CR |
| Atrophaneura luchti | VU | |
| Atrophaneura schadenbergi | VU | |
| Attebania bernasconii | CR | |
| Atuna cordata | VU | |
| Atuna elliptica | VU | |
| Atuna indica | EN | |
| Atuna penangiana | VU | |
| Atuna travancorica | EN | |
| Aubregrinia taiensis | CR | |
| Auerodendron pauciflorum | CR | |
| Augustula braueri | VU | |
| Aulacorhynchus huallagae | Yellow-browed Toucanet | EN |
| Aulohalaelurus kanakorum | New Caledonia Catshark | VU |
| Aulonocara auditor | VU | |
| Aulopyge huegelii | Dalmation Barbelgudgeon | EN |
| Auriculella expansa | EX | |
| Austroassiminea letha | Leeuwin-naturaliste Amphibious Snail | VU |
| Austrofolium equatorianum | VU | |
| Austrogammarus australis | EX | |
| Austrolebias cinereus | CR | |
| Austrolestes minjerriba | Dune Ringtail | EN |
| Austromyrtus horizontalis | VU | |
| Austromyrtus lotoides | VU | |
| Austropyrgus grampianensis | CR | |
| Austrosaga spinifer | VU |