American Rubyspot damselflies

American Rubyspot (Hetaerina americana) is a member of the Family Calopterygidae (Broad-winged damselflies). They are common from May to October along rocky streams with riffles, such as the Potomac River at Riverbend Park.

Female

Female American Rubyspots are quite variable in appearance. The following specimen has a metallic green thorax and dark-colored abdomen; its wings feature a color gradient from red at the base to diffuse reddish-orange at the wing tips.

An American Rubyspot damselfly (Hetaerina americana) spotted along the Potomac River at Riverbend Park, Fairfax County, Virginia USA. This individual is a female.

04 AUG 2016 | Riverbend Park | American Rubyspot (female)

The following annotated image illustrates some of the reproductive anatomy of a female American Rubyspot: two cerci (sing. cercus), superior appendages that have little or no function; and two styli (sing. stylus), structures that serve as sensors in egg positioning.

An American Rubyspot damselfly (Hetaerina americana) spotted along the Potomac River at Riverbend Park, Fairfax County, Virginia USA. This individual is a female.

04 AUG 2016 | Riverbend Park | American Rubyspot (female)

(See a full-size version of the original photo, without annotation.)

Male

Male American Rubyspots have a metallic red thorax and dark-colored abdomen; its wings feature well-defined ruby-colored spots at the base. I was so focused on photographing the deep red wing spots that I forgot to shoot a dorsal view of the terminal appendages! No problem. See the digital scans under “Related Resources.”

An American Rubyspot damselfly (Hetaerina americana) spotted along the Potomac River at Riverbend Park, Fairfax County, Virginia USA. This individual is a male.

08 AUG 2016 | Riverbend Park | American Rubyspot (male)

(See a full-size version of the original photo, without annotation.)

All male damselflies have four terminal appendages, collectively called “claspers.” Male damselfly terminal appendages don’t look exactly the same for all species of damselflies, but their function is identical. Claspers are used to grab and hold female damselflies during mating: an upper pair of cerci (“superior appendages”) and a lower pair of paraprocts (“inferior appendages”).

Related Resources:

Copyright © 2016 Walter Sanford. All rights reserved.

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5 Responses to “American Rubyspot damselflies”

  1. Pete Hillman Says:

    Great images and information.

  2. Top 10 Photos of 2016 | walter sanford's photoblog Says:

    […] 04 AUG 2016 | Riverbend Park | American Rubyspot (female) […]

  3. American Rubyspot damselfly (male) | walter sanford's photoblog Says:

    […] along the Potomac River at Riverbend Park, Fairfax County, Virginia USA. This individual is a male, as indicated by his coloration and […]

  4. American Rubyspot damselfly (female) | walter sanford's photoblog Says:

    […] individual is a female, as indicated by her terminal appendages and […]

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