ARKive's most wanted species listed alphabetically by scientific name
| Scientific name | Common name | Status |
|---|---|---|
| Cabalus modestus | Chatham Rail | EX |
| Cacicus koepckeae | Selva Cacique | VU |
| Caconemobius howarthi | Howarth's Cave Cricket | VU |
| Caconemobius schauinslandi | Schauinsland's Bush Cricket | VU |
| Caconemobius varius | Kaumana Cave Cricket | VU |
| Cacosmia harlingii | VU | |
| Cadiscus aquaticus | CR | |
| Caecidotea barri | Clifton Cave Isopod | EN |
| Caecidotea nickajackensis | Nickajack Cave Isopod | VU |
| Caecobarbus geertsii | Congo blind barb (FB) | VU |
| Caecocypris basimi | VU | |
| Caenolestes condorensis | VU | |
| Caenolestes convelatus | Blackish Shrew Opossum | VU |
| Caesalpinia nhatrangense | VU | |
| Cairnsichthys rhombosomoides | Cairns Rainbowfish | VU |
| Calamagrostis fulgida | VU | |
| Calamagrostis hirta | VU | |
| Calamagrostis steyermarkii | VU | |
| Calamagrostis teretifolia | VU | |
| Calamaria abstrusa | Padang Reed Snake | EN |
| Calamaria ingeri | EN | |
| Calamodontophis paucidens | VU | |
| Calamodontophis ronaldoi | EN | |
| Calamoecia australica | VU | |
| Calamoecia elongata | VU | |
| Calamoecia zeidleri | VU | |
| Calamus egregius | VU | |
| Calamus obovoideus | CR | |
| Calanthe fargesii | VU | |
| Calanthe henryi | VU | |
| Calanthe yuana | EN | |
| Calathea anulque | EN | |
| Calathea congesta | VU | |
| Calathea curaraya | VU | |
| Calathea dodsonii | CR | |
| Calathea gandersii | VU | |
| Calathea hagbergii | EN | |
| Calathea ischnosiphonoides | EN | |
| Calathea latrinotecta | VU | |
| Calathea multicinta | VU | |
| Calathea pluriplicata | VU | |
| Calathea roseobracteata | EN | |
| Calatola columbiana | EN | |
| Calceolaria adenanthera | VU | |
| Calceolaria bentae | EN | |
| Calceolaria brachiata | VU | |
| Calceolaria commutata | EN | |
| Calceolaria frondosa | EN | |
| Calceolaria harlingii | VU | |
| Calceolaria obtusa | EN |