1. Small black sawfly native to Europe but established in eastern United States; larvae mine the leaves of birches causing serious defoliation
   - Fenusa pusilla

Type of: sawfly

• genus Mustelus
• genus Mutinus
• genus Mutisia
• genus Mya
• genus Myadestes
• genus Mycobacterium
• genus Mycoplasma
• genus Mycteria
• genus Mycteroperca
• genus Mylodon
• genus Myocastor
• genus Myopus
• genus Myosotis
• genus Myotis
• genus Myrciaria
• genus Myrica
• genus Myricaria
• genus Myriophyllum
• genus Myristica
• genus Myrmecia
• genus Myrmecobius
• genus Myrmecophaga
• genus Myrmeleon
• genus Myroxylon
• genus Myrrhis