M. formosa

M. formosa may refer to:


 * Macarostola formosa, an Oceanian moth
 * Marmosa formosa, a mouse opossum
 * Mesodma formosa, an extinct mammal
 * Mesosemia formosa, a South African butterfly
 * Myrmarachne formosa, a jumping spider
 * Myrmecia formosa, an Australian ant