Bibio marci (NL: Maartse vlieg, Sint Marcus-vlieg / EN: Bibio marci, St. Mark’s fly / DE: Märzfliege, Märzhaarmücke, Markusfliege, Markushaarmücke / FR: Bibion, Mouche de la Saint Marc) is a fly from the family Bibionidae. Their common name comes from the fact that the adults usually emerge around St Mark's Day, 25th April. Bibio marci is a large, hairy black fly that is easily recognised by the males’ ‘dancing’ up-and-down flight and long dangling legs hanging down. Biblio marci species shows strong sexual dimorphism, meaning that males and females look very different. Males are around 12mm long with very large eyes and clear wings. Females are around 14mm long with much smaller eyes and heads and smoky brown wings. Males use their large eyes to help them spot and catch females in the mating swarm, and to see and chase off rival males. Adults live for about a week spending most of their lives in the larval stage. After mating females lay their eggs in the soil and die shortly afterwards.
Image: Villécloye (FR) – 12/05/2012
© Johan Dierckx
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