Posts Tagged ‘Family Calopterygidae’

American Rubyspot damselflies

August 21, 2016

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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Ebony Jewelwing damselflies (male, female)

August 9, 2015

Ebony Jewelwing (Calopteryx maculata) is a member of the Family Calopterygidae (Broad-winged damselflies). They are common from May to July along wooded slow-moving streams such as Dogue Creek in Wickford Park.

Male

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”).

An Ebony Jewelwing damselfly (Calopteryx maculata) spotted at Dogue Creek, Wickford Park, Fairfax County, Virginia USA. This individual is a male.

05 AUG 2015 | Wickford Park | Ebony Jewelwing (male)

The preceding image also shows the male hamules, …

paired structures that project from pocket under the second segment [S2] and hold female abdomen in place during copulationSource Credit: Glossary [of] Some Dragonfly Terms, by Dennis R. Paulson.

After a male damselfly grabs a female with his claspers, he transfers sperm from the genital opening under the ninth abdominal segment (S9) to his hamules, located beneath the second abdominal segment (S2). Next the pair forms the mating wheel, then the male transfers sperm from his hamules to the female through her genital pore under the eighth abdominal segment (S8).

A mating pair of Ebony Jewelwing damselflies (Calopteryx maculata) spotted at Huntley Meadows Park, Fairfax County, Virginia USA. This pair is in wheel (in heart).

06 JUN 2015 | HMP | Ebony Jewelwing (mating pair, in wheel)

The copulatory, or wheel, position is unique to the Odonata, as is the distant separation of the male’s genital opening and copulatory organs. That the position looks as much like a heart as a wheel has been noted. Source Credit: Paulson, Dennis (2011-12-19). Dragonflies and Damselflies of the East (Princeton Field Guides) (Kindle Locations 377-378). Princeton University Press. Kindle Edition.

Female A simple field marker may be used to differentiate male and female Ebony Jewelwings: females feature white pterostigmata (see below); males don’t.

An Ebony Jewelwing damselfly (Calopteryx maculata) spotted at Dogue Creek, Wickford Park, Fairfax County, Virginia USA. This individual is an adult female.

05 AUG 2015 | Wickford Park | Ebony Jewelwing (adult female)

The preceding annotated image illustrates some of the reproductive anatomy of a female Ebony Jewelwing: a cercus (pl. cerci), one of two superior appendages that have little or no function; a stylus (pl. styli), one of two structures that serve as sensors in egg positioning; and an ovipositor that is used to insert eggs into submerged vegetation (endophytic oviposition). Notice the mud on the tip of the female’s abdomen, indicating she laid eggs recently.

Copyright © 2015 Walter Sanford. All rights reserved.

Ebony Jewelwing damselfy (female)

August 7, 2011
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An Ebony Jewelwing damselfly (Calopteryx maculata) spotted during a photowalk through “Paul Spring Park,” one of seven small parks owned and maintained by the Community Association of Hollin Hills (CAHH), Fairfax County, Virginia USA. The individual shown in the preceding photo gallery is a female, as indicated by its dull brown body and smoky wings with bright white spots near the wingtips. (Males have metallic green bodies and opaque black wings.)

The Ebony Jewelwing is one of eight species of broad-winged damselflies, a family of medium-size damselflies that have butterfly-like flight. Like all broad-winged damselflies, Ebony Jewelwing damselflies are usually found along small creeks and streams, near the water.

Related Resources:

Tech Tips: Photo 1 of 2 is a copy of the original photograph, cropped to highlight the damselfly; Photo 2 of 2 is the original photograph. Photo 1 was cropped and edge sharpened using Apple “Aperture,” a professional-grade tool for organizing and adjusting photos. Apple “Preview” was used to annotate Photo 1 to highlight the bright white spots near the damselfly’s wingtips.

Ebony Jewelwing damselfies

July 18, 2011
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Several Ebony Jewelwing damselflies (Calopteryx maculata) spotted during a photowalk through the “Wildlife Sanctuary,” one of seven small parks owned and maintained by the Community Association of Hollin Hills (CAHH), Fairfax County, Virginia USA. The individuals shown in the preceding photo gallery are males, as indicated by their metallic green bodies and opaque black wings. (Females have dull brown bodies and smoky wings with bright white spots near their wingtips.)

The Ebony Jewelwing is one of eight species of broad-winged damselflies, a family of medium-size damselflies that have butterfly-like flight. Like all broad-winged damselflies, Ebony Jewelwing damselflies are usually found along small creeks and streams, near the water.

Related Resources:


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