Posts Tagged ‘Tramea lacerata’

Black Saddlebags dragonfly (male, excreting)

October 2, 2012

A Black Saddlebags dragonfly (Tramea lacerata) spotted near the shore of Accotink Bay. Male dragonflies have three terminal appendages, called “claspers,” including a pair of upper appendages called “cerci” and one lower appendage called an “epiproct.” The male dragonfly’s claspers are used to grab and hold female dragonflies during mating. Notice this dragonfly has a mysterious fourth appendage, and it appears to be growing!

856-cr2-ver2_aperture868-cr2-ver2_aperture

I have photographed dragonflies perching, flying, mating, eating, and now (drum roll, please) … excreting! My photo catalog of dragonfly behaviors is finally complete.

Habitat: Accotink Bay Wildlife Refuge, a 1,200 acre preserve located at Army Garrison Fort Belvoir, Fairfax County, Virginia USA.

Copyright © 2012 Walter Sanford. All rights reserved. www.wsanford.com

Advertisements

Black Saddlebags dragonfly (male)

September 23, 2012

A Black Saddlebags dragonfly (Tramea lacerata) spotted in a field located approximately 100 yards from the shore of Accotink Bay. This individual is a male, as indicated by the secondary genitalia located on the underside of abdominal segments 2-3, and by the “claspers” (terminal appendages) at the end of its abdomen. Notice the hind wings of Black Saddlebags are broader than its fore wings, a characteristic of many migratory species of dragonflies.

Remember that all dragonflies and damselflies have a 10-segmented abdomen, numbered from front to back.

944_-cr2-ver3_aperture944-cr2-ver2_aperture948-cr2-ver2_aperture988-cr2-ver2_aperture1008-cr2-ver2_aperture

Habitat: Accotink Bay Wildlife Refuge, a 1,200 acre preserve located at Army Garrison Fort Belvoir, Fairfax County, Virginia USA.

Copyright © 2012 Walter Sanford. All rights reserved. www.wsanford.com


%d bloggers like this: