Crosse identified them as being members of the genus "Acarus". Baker's itch is a cutaneous reaction caused by bites of "Acarus siro", the flour mite. Mites causing similar problems are in the genera "Acarus", "Glycyphagus", "Tyrophagus", and others. In 1758, Carl Linnaeus described a single species, "Acarus batatas" (now "Trombicula batatas"). Ticks include "Dermacentor pictus", "Ixodes ricinus", "I. persulcatus", "I. crenulatus", and "Acarus siro". Acarus is a genus of mites in the family Acaridae.