Blue Dasher dragonfly terminal appendages

Blue Dasher (Pachydiplax longipennis) is a member of the Skimmer Family of dragonflies that is commonly spotted during the summer months at many water bodies in the mid-Atlantic United States.

Blue Dashers display sexual dimorphism; terminal appendages may be used to differentiate immature males from females.

Male dragonflies have three terminal appendages, collectively called “claspers,” that are used to grab and hold female dragonflies during mating: an upper pair of cerci (“superior appendages”) and a lower unpaired epiproct (“inferior appendage”).

Female dragonflies have a pair of cerci (superior appendages) that have little or no function.

Related Resources: Odonate Terminal Appendages.

Copyright © 2015 Walter Sanford. All rights reserved.

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2 Responses to “Blue Dasher dragonfly terminal appendages”

  1. Teneral | walter sanford's photoblog Says:

    […] 02 SEP 2016 | Huntley Meadows Park | Blue Dasher (teneral male) […]

  2. Arachnids 2, Odonates 0 | walter sanford's photoblog Says:

    […] Pond, Meadowood Recreation Area, Fairfax County, Virginia USA. The dragonfly, possibly an immature male Blue Dasher (Pachydiplax longipennis), is infested with parasitic red water […]

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