ARKive's most wanted species listed alphabetically by scientific name
| Scientific name | Common name | Status |
|---|---|---|
| Meriania acostae | EN | |
| Meriania amplexicaulis | VU | |
| Meriania grandiflora | VU | |
| Meriania stellata | EN | |
| Meridolum benneti | VU | |
| Meridolum corneovirens | EN | |
| Meridolum depressum | VU | |
| Meriones dahli | Dahl's Jird | EN |
| Merrilliobryum fabronioides | EN | |
| Merrilliopanax chinensis | CR | |
| Mertensophryne howelli | EN | |
| Mertensophryne nyikae | VU | |
| Mertensophryne usambarae | EN | |
| Meryta choristantha | VU | |
| Meryta sonchifolia | VU | |
| Mesagrion leucorrhinum | VU | |
| Mesaspis juarezi | EN | |
| Mesocapromys angelcabrerai | Cabrera's Hutia | EN |
| Mesocapromys auritus | Large-eared Hutia | EN |
| Mesocapromys nanus | Dwarf Hutia | CR |
| Mesocapromys sanfelipensis | San Felipe Hutia | CR |
| Mesoclemmys dahli | Dahl's Toad-headed Turtle | CR |
| Mesoclemmys zuliae | Zulia Toad-headed Turtle | VU |
| Mesocnemis tisi | Liberian Riverjack | EN |
| Mesocyclops insulensis | VU | |
| Mesodon clenchi | Mission Creek Oregonian | EN |
| Mesogyne insignis | VU | |
| Mesonerilla prospera | CR | |
| Mesonoemacheilus herrei | CR | |
| Mesonoemacheilus pambarensis | Pambar Banded Loach | VU |
| Mesonoemacheilus pulchellus | EN | |
| Mesopristes elongatus | VU | |
| Mesua kochummenia | VU | |
| Mesua manii | CR | |
| Metacyclops gasparoi | VU | |
| Metacyclops postojnae | VU | |
| Metadiaptomus purcelli | VU | |
| Metalepis gentryi | CR | |
| Metalepis haughtii | CR | |
| Metallura iracunda | Perija Metaltail | EN |
| Metatrichoniscoides celticus | VU | |
| Meteoromyrtus wynaadensis | CR | |
| Metrosideros bartlettii | EN | |
| Metrosideros ochrantha | VU | |
| Metteniusa cundinamarcensis | VU | |
| Metteniusa huilensis | VU | |
| Metteniusa santanderensis | VU | |
| Mexilana saluposi | VU | |
| Mexistenasellus coahuila | EN | |
| Mexistenasellus nulemex | VU |