Erythrodiplax anatoidea

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Erythrodiplax anatoidea
Subordination : Dragonflies (Anisoptera)
Superfamily : Libelluloidea
Family : Libellulidae (Libellulidae)
Subfamily : Sympetrinae
Genre : Erythrodiplax
Type : Erythrodiplax anatoidea
Scientific name
Erythrodiplax anatoidea
Borror , 1942

Erythrodiplax anatoidea is a slender, small species of dragonfly from the subfamily Sympetrinae . It occurs around the city of Porto Velho on the upper reaches of the Rio Madeira . The name anatoidea is derived from the external similarity of the animal to representatives of the genus Anatya .


Erythrodiplax anatoidea is a blue-black species whose males and females reach abdomen lengths of around 19 millimeters. The male abdomen, like the thorax and legs, is blue-black, with the thorax and the first four abdominal segments shimmering bluish. The female coloring tends to be brownish-black and thus represents a sexual dichroism . The females also have a faint, lighter lateral stripe on the abdomen . This strip widens on the second and third segments to approximately two thirds of the width of the abdomen. In addition, it has a bluish shimmer on the first five segments.

The transparent hind wings of the females are about 23 millimeters, those of the males 22 millimeters long. Distally , both pairs of wings are tinted slightly brown. The pterostigma measures 2.2 millimeters in males and 2.6 millimeters in females.

Similar species

Distribution areas of the species Erythrodiplax anatoidea (green), Erythrodiplax angustipennis (yellow) and Erythrodiplax longitudinalis (red), all part of the longitudinalis group

The species is particularly similar to Erythrodiplax angustipennis and Erythrodiplax longitudinalis . A reliable distinction can be made via the structure of the second genital segment of the males. Erythrodiplax anatoidea also lacks the yellow lateral stripe on the thorax, as occurs in Erythrodiplax longitudinalis . Compared to Erythrodiplax angustipennis, it helps that the abdominal appendages are yellow and not black.


  1. a b c Donald Joyce Borror : A Revision of the Libelluline Genus Erythrodiplax (Odonata) [p. 66ff], The Ohio State University, Columbus, 1942