Established
| Common name (English) | |
|---|---|
| Metaphycus helvolus | |
| Metaphycus lounsburyi | |
| Micranisa degastris | |
| Microcosmus exasperatus | |
| Microterys nietneri | |
| Miomantis paykullii | |
| Mirabilis jalapa | Marvel-of-peru, Beauty of the Night |
| Mnemiopsis leidyi | Comb jelly, Sea walnut |
| Mnestia girardi | |
| Monellia caryella | |
| Monomorium bicolor | |
| Monomorium exiguum | |
| Morus alba | White mulberry |
| Mus musculus | House mouse |
| Myiopardalis pardalina | Melon fly |
| Myriophyllum spicatum | |
| Mythimna unipuncta | True armyworm moth, White-speck moth, Common armyworm, Rice armyworm |
| Myzus persicae | Green peach aphid; Greenfly; Peach-potato aphid |
| Naineris setosa | |
| Najas marina | Hollyweed |