Posts Tagged ‘Family Calopterygidae’

American Rubyspot damselfly (male)

June 24, 2020

During a photowalk with Michael Powell in Fairfax County, Virginia USA, Mike spotted an American Rubyspot damselfly (Hetaerina americana) perched facing the Potomac River. This individual is a male, as indicated by his red coloration, hamules, and terminal appendages.

All of the photos in the following gallery look similar, although there are subtle differences.

The first photo is the “record shot” for this individual, that is, “get a shot, any shot.” Actually, this one turned out to be a good photo! The camera was set for an aperture of f/5.6 for all shots in the gallery. This viewing angle provided the clearest look at his terminal appendages given the relatively shallow depth-of-field.

08 JUN 2020 | Fairfax County, VA | American Rubyspot (male)

The next photo shows a better look at the damselfly’s metallic ruby red face. Handsome!

08 JUN 2020 | Fairfax County, VA | American Rubyspot (male)

Finally, I just like the look of the “light” in the last photo. Dark and moody.

08 JUN 2020 | Fairfax County, VA | American Rubyspot (male)

Related Resource: American Rubyspot – a blog post by Michael Powell

Copyright © 2020 Walter Sanford. All rights reserved.

Ebony Jewelwing damselfly (female)

June 10, 2020

Two members of Family Calopterygidae (Broad-winged Damselflies) can be found in Fairfax County, Virginia USA: American Rubyspot (Hetaerina americana); and Ebony Jewelwing (Calopteryx maculata). Ebony Jewelwing seems to be more common than American Rubyspot in Fairfax County.

08 JUN 2020 | Fairfax County, VA | Ebony Jewelwing (female)

The preceding photo of an Ebony Jewelwing is one of my “warm-up shots” from a recent photowalk with Michael Powell at a location in Fairfax County, Virginia USA.

This individual is a female. A simple field mark may be used to differentiate female and male Ebony Jewelwing: females feature white pterostigmata; males don’t.

Related Resources

Copyright © 2020 Walter Sanford. All rights reserved.

American Rubyspot damselfly (female)

September 4, 2019

An American Rubyspot damselfly (Hetaerina americana) was spotted during a photowalk with Michael Powell along Popes Head Creek at Hemlock Overlook Regional Park (HORP), Fairfax County, Virginia USA.

29 AUG 2019 | HORP | American Rubyspot (female)

This individual is a female, as indicated by her muted coloration (relative to males of the same species), thick abdomen, and terminal appendages.

29 AUG 2019 | HORP | American Rubyspot (female)

Mike and I saw the female as we worked our way upstream, and again on the way downstream. She was near the same location both times, perched facing the water.

Copyright © 2019 Walter Sanford. All rights reserved.

Denizen of the seep

July 8, 2019

An Ebony Jewelwing damselfly (Calopteryx maculata) was spotted near a forest seep located in Occoquan Regional Park, Fairfax County, Virginia USA. This individual is a male, as indicated by the absence of white pterostigma — a field mark used to identify females of the same species.

Look for Ebony Jewelwing beginning in late-May/early-June along almost any small- to mid-size forest stream in Northern Virginia (USA).

Ebony Jewelwing is a member of Family Calopterygidae (Broad-winged Damselflies). American Rubyspot (Hetaerina americana) is the only other species of Broad-winged Damselfly found in Northern Virginia.

Adult flight period

According to records for the Commonwealth of Virginia maintained by Dr. Steve Roble, Staff Zoologist at the Virginia Department of Conservation and Recreation, Division of Natural Heritage, the adult flight period for C. maculata is from April 27 to October 06. The species is classified as common. Its habitat is “streams, rivers.”

Copyright © 2019 Walter Sanford. All rights reserved.

Ebony Jewelwing damselflies (mating pair)

June 26, 2018

A mating pair of Ebony Jewelwing damselflies (Calopteryx maculata) was spotted near a small forest stream at Occoquan Regional Park. The male is shown on the left; the female on the right.

The damselflies are “in wheel,” in which the male uses “claspers” (terminal appendages) at the end of his abdomen to hold the female by her neck/thorax while they are joined at their abdomens. The wheel position is sometimes referred to as “in heart” when damselflies mate.

Copyright © 2018 Walter Sanford. All rights reserved.

Ebony Jewelwing damselfly (male)

June 18, 2018

Look for Ebony Jewelwing damselflies (Calopteryx maculata) beginning in late-May/early-June along almost any small- to mid-size forest stream in Northern Virginia (USA).

This individual is a male, as indicated by the all-black coloration of his wings and by his terminal appendages.

Ebony Jewelwing is a member of Family Calopterygidae (Broad-winged Damselflies). American Rubyspot (Hetaerina americana) is the only other species of Broad-winged Damselfly found in Northern Virginia.

Related Resource: The adult flight period for Ebony Jewelwing is from April 27 to October 06, according to records for the Commonwealth of Virginia maintained by Dr. Steve Roble, a zoologist at the Virginia Department of Conservation and Recreation, Division of Natural Heritage.

Copyright © 2018 Walter Sanford. All rights reserved.

Another focus stacking face-off

April 19, 2018

Here’s another face-off between a single macro photo and a focus-stacked composite image. Let’s start with the composite image this time.

The first example is a composite image created from 14 photos.

In a recent blog post, I wrote…

My goal is to shoot the fewest number of photos (using a relatively small aperture such as f/18) that will show the entire specimen in focus when the photo set is focus-stacked to create a composite image. Source Credit: More Calico Pennant exuvia composite images.

I used to shoot several photos of a single focus point, e.g., the prementum, and select the sharpest image for editing/focus stacking. Now I’m using a wider aperture such as either f/11 or f/8 (for sharpness), shooting more photos, and using every photo that I take. My rationale is simple: A single photo may not be the sharpest photo of a single focus point, but it probably shows other areas that are in focus. In this case, I think more “raw material” is better than less.

The last example is one of the better photos from the set of 14. When you click on the images they open in a new tab automatically. Toggle back-and-forth between tabs and I think you will agree the composite image is clearly better than the following single photo.

The Backstory

An American Rubyspot damselfly (Hetaerina americananymph was collected by Bob Perkins on 06 August 2017 along the New River in Grayson County, Virginia USA. The nymph was reared in captivity, albeit briefly, until it emerged on 09 August 2017.

Copyright © 2018 Walter Sanford. All rights reserved.

Why focus stack macro photos?

April 17, 2018

Why focus stack macro photos? The answer is obvious: The difference between a single macro photo and a focus-stacked composite image is like night and day.

The first example is one of the better photos from a set of 13. It is the same photo that is featured in Hetaerina americana exuvia, my identification guide for American Rubyspot damselfly exuviae.

The last example is a composite image created using all 13 photos in the set.

You may not notice the difference in quality unless you look at the full-size version of both images. When you click on the images they open in a new tab automatically. Toggle back-and-forth between tabs and I think you will agree the composite image is clearly better than the single photo.

The Backstory

An American Rubyspot damselfly (Hetaerina americananymph was collected by Bob Perkins on 06 August 2017 along the New River in Grayson County, Virginia USA. The nymph was reared in captivity, albeit briefly, until it emerged on 09 August 2017.

Copyright © 2018 Walter Sanford. All rights reserved.

Hetaerina americana exuvia

March 18, 2018

An American Rubyspot damselfly (Hetaerina americananymph was collected by Bob Perkins on 06 August 2017 along the New River in Grayson County, Virginia USA. The nymph was reared in captivity, albeit briefly, until it emerged on 09 August 2017.

Pattern recognition can be used to tentatively identify damselfly larvae/exuviae to the family level: the shape of the prementum is characteristic for each of the three families of damselflies that occur in the mid-Atlantic region of the United States of America; mnemonics can be used to remember each distinctive shape.

Family Calopterygidae (Broad-winged Damselflies) features a prementum with a shape that looks somewhat similar to Family Coenagrionidae (Narrow-winged Damselflies). Look for an embedded raindrop shape, located toward the upper-center of the prementum.

Also notice another field mark for Calopterygidae: the first antenna segment is equal to or longer than the length of the other six (6) segments added together. (Editor’s Note: Some of the smaller antennae segments are missing. It’s likely those delicate parts broke off during shipping and/or cleaning.)

No. 2 | Hetaerina americana | exuvia (ventral)

Two field marks verify the genus and species of this specimen as Hetaerina americana: the labial cleft extends only to the base of the palpal lobes, as shown in Photo No. 1; and the external gills are 8.5 mm to 10 mm long (Daigle, 1991), as shown in Photo No. 2.

Before and after

Photo No. 3 shows a dorsal view of the exuvia before it was cleaned in order to remove unknown fibers covering the body and dirt/debris that obscured the labial cleft in the prementum.

No. 3 | Hetaerina americana | exuvia (dorsal)

Photo No. 1, 2 and 4 show the exuvia after cleaning. The operation appears to have been successful, other than collateral damage to two legs.

No. 4 | Hetaerina americana | exuvia (dorsal)

The next photograph shows the damselfly during emergence from one of Bob Perkins‘ holding tanks. Good timing, Bob!

Image used with permission from Bob Perkins.

The last photo shows the adult American Rubyspot damselfly sometime after emergence. Hetaerina americana is 38-46 mm in total length (Paulson, 2011). This individual is a male, as indicated by its hamules and terminal appendages.

Image used with permission from Bob Perkins.

Related Resource: Florida Damselflies (Zygoptera) – A Species Key to the Aquatic Larval Stages, by Jerrell James Daigle. Technical Series, Volume 11, Number 1, December 1991. State of Florida, Department of Environmental Regulation.

Tech Tips

The following equipment was used to shoot Photo No. 2, 3 and 4: Canon EOS 5D Mark II digital camera, in manual mode; Kenko 20mm macro automatic extension tubeCanon EF100mm f/2.8L Macro lens (set for manual focus); Canon MT-26EX-RT Macro Twin Lite. Photo No. 1 , 2 and 4: the Canon MT-26 was set for “Master” mode, and Canon 580 EX- and Canon 580EX II Speedlites were set for “Slave” mode. A Canon MP-E 65mm Macro lens (manual focus only, set for 2x magnification) plus multiple-flash setup was used for Photo No. 1.

Adobe Photoshop CC 2017 was used to annotate selected images.

Bob Perkins’ photos were shot using a Canon EOS Rebel T3i camera body and Canon EF-S 60mm macro lens.

Copyright © 2018 Walter Sanford. All rights reserved.

American Rubyspot damselfly exuvia

March 12, 2018

An American Rubyspot damselfly (Hetaerina americana) nymph was collected by Bob Perkins on 06 August 2017 along the New River in Grayson County, Virginia USA. The nymph was reared in captivity, albeit briefly, until it emerged on 09 August 2017.

This individual is a member of the Family Calopterygidae (Broad-winged Damselflies), as indicated by the length of antenna segment 1 (shown below). See Hetaerina americana exuvia for a more detailed explanation.

No. 1 | Hetaerina americana | exuvia (dorsal)

If you look closely at the full-size version of both photos, then you should notice the specimen is covered by a lot of fibers of unknown origin.

That nymph was in the final instar when I collected it. Therefore it didn’t shed the algae and debris that had collected on its bristles. Source Credit: Personal communication with Bob Perkins.

A quick look at the prementum (below) shows the labial cleft, a key field mark for verifying the species, is obscured by some of the “debris” that Bob mentioned. As of this writing, the exuvia is soaking in a soapy water bath in the hope that it can be cleaned sufficiently to see that field mark clearly.

No. 2 | Hetaerina americana | exuvia (ventral)

To be continued

Tech Tips

The following equipment was used to shoot Photo No. 1 and 2: Canon EOS 5D Mark II digital camera, in manual mode; Kenko 20mm macro automatic extension tubeCanon EF100mm f/2.8L Macro lens (set for manual focus); and Canon MT-26EX-RT Macro Twin Lite.

Two Sunpak LED-160 Video Lights (each with a white translucent plastic filter) were used for both photos.

Adobe Photoshop CC 2017 was used to annotate both images.

Copyright © 2018 Walter Sanford. All rights reserved.


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