Posts Tagged ‘Old Colchester Park and Preserve’

Common Green Darner dragonfly (young male)

September 27, 2019

A mini-swarm of Common Green Darner dragonflies (Anax junius) was spotted at a dry vernal pool, Old Colchester Park and Preserve (OCPP), Fairfax County, Virginia USA. A few Black Saddlebags dragonflies were mixed in with the swarm of A. junius.

Some of the dragonflies were hawking smaller insects; others were resting on vegetation. It’s probable members of the swarm had stopped to rest and refuel before continuing their southward migration.

The following Common Green Darner dragonfly was perched in a bed of dried cattails.

18 SEP 2019 | OCPP | Common Green Darner (young male)

This individual is a young male, as indicated by his terminal appendages. Notice there are points on the tips of his cerci, as shown in the full-size version of the preceding photo. Female cerci are pointless, both literally and figuratively.

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Copyright © 2019 Walter Sanford. All rights reserved.

Blue-faced Meadowhawk dragonflies (males)

April 5, 2019

Two Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) were spotted at Old Colchester Park and Preserve (OCPP), Fairfax County, Virginia USA. There is a true vernal pool at the park where Blue-faced Meadowhawks are relatively abundant.

03 OCT 2016 | OCPP | Blue-faced Meadowhawk (male)

Both individuals are male, as indicated by their coloration and terminal appendages.

03 OCT 2016 | OCPP | Blue-faced Meadowhawk (male)

Copyright © 2019 Walter Sanford. All rights reserved.

Blue-faced Meadowhawk mating frenzy

December 8, 2016

Old Colchester Park and Preserve (OCPP), Fairfax County, Virginia USA is one of a few places in Northern Virginia where Blue-faced Meadowhawk dragonfly (Sympetrum ambiguum) is known to occur. OCPP is located near Mason Neck West Park.

More than ten mating pairs of Blue-faced Meadowhawks were spotted at a small vernal pool in the park; the pool was almost completely dry on the day of my visit.

Andromorph females

Some species of dragonflies, such as Blue-faced Meadowhawk, display sexual dimorphism; females are polymorphic for a smaller subset of those species. Andromorph females are male-like in color; heteromorph females are duller in color than males.

Andromorph female Blue-faced Meadowhawk dragonflies, like the ones shown below, are less common than heteromorph females. Andromorphs have a red abdomen with black rings, like male Blue-faced Meadowhawks; unlike males, most female faces are tan and their terminal appendages look different than male appendages.

No. 1

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is an andromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

No. 2

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is an andromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

No. 3

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is an andromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

Heteromorph females

The following photos show heteromorph female Blue-faced Meadowhawk dragonflies. Heteromorphs have a tan abdomen with black rings.

No. 4

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is a heteromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

No. 5

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is a heteromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

No. 6

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is a heteromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

No. 7

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is a heteromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

No. 8

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is a heteromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

No. 9

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is a heteromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

No. 10

A mating pair of Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted at Old Colchester Park and Preserve, Fairfax County, Virginia USA. This pair is "in wheel." The female is a heteromorph.

27 SEP 2016 | OCPP | Blue-faced Meadowhawk (mating pair, “in wheel“)

Copyright © 2016 Walter Sanford. All rights reserved.


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