STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
March fly. Coloured scanning electron micrograph (SEM) of a female march fly (family Bibionidae). March Flies are sexually dimorphic, with males having bigger heads and huge eyes and females having much smaller heads and eyes. Adults emerge synchronously in huge numbers and often form dense mating aggregations. Males form loose "swarms" and copulate immediately with females as they emerge from the soil. After mating, female bibionines dig a small chamber in the soil with their fossorial (modified for digging) fore legs, lay eggs, and die within the chamber. Magnification: x 15 when printed at 10 centimetres across.
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