Monday, April 6, 2015

Ebony Jewelwing

These Ebony Jewelwing photos are from last summer. I found these damselflies in the Carleton College arboretum. Unlike males, females, like in the first picture, have white spots on their wings. These markings are called stigma. Sigma have several, non-mutually exclusive functions. They can serve as signals to potential mates or rivals. They may act as weights to dampen wing vibrations. Finally, they may increase wing flexibility and thereby guard against stress fractures (Seattlepi.com).

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