Botanophila fugax
Botanophila fugax is a species of fly in the family Anthomyiidae. It is found in the Palearctic. The larva is a stem borer.
Fungal species Strongwellsea crypta is known to infect Botanophila fugax. It creates abdominal holes in the infected hosts which then develop rapidly and become strikingly large and almost rhomboid in shape.