Erythrodiplax attenuata
| Erythrodiplax attenuata | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Erythrodiplax attenuata | ||||||||||||
| ( Kirby , 1889) |
Erythrodiplax attenuata is a species of dragonfly from the subfamily Sympetrinae . It wasdescribedby Kirby in 1889. Since Borror's revision of the genus, it has been assigned to the Attenuata group . The species is mainly found in the Amazon region. But it also occurs in the southern parts of Colombia and along some southern tributaries of the Amazon.
features
The abdomen in both sexes, between 18.0 and 22.5 millimeters long , has a black and yellow pattern, like the rest of the animal. The thorax of young animals is still yellowish and only in exceptional cases slightly greenish to reddish. The yellow basic color is accompanied by black spots on the back and at the base of the legs , which spread noticeably with age. In fact, except for a few remaining yellow spots, the entire thorax may turn black. The forehead is metallic blue, with two yellowish to yellowish brown spots at the base of the antennae . The mouthparts are yellow. The hind wings are between 20.0 and 26.0 millimeters in the males; in the female between 20.5 and 27.5 millimeters long and have a wing mark up to 3.0 millimeters in size ( pterostigma ). There are four different types of wing patterning. By far the most common shape consists of just a small spot at the base of the wing. In the second form, which can only be observed in females, there are also some relatively large, diffuse postnodal spots. The third and fourth patterns only occur in adult animals. In the third, the basal spot is larger and a band results from the postnodal spots. In the fourth option, there is again a band in the forewing, while the rear wing is now brownish black from the base to two rows of cells in front of the wing mark.
Similar species
Erythrodiplax venusta is particularly similar to the species . In addition to the differences in the penis structure, the color or pattern is different. In E. venusta , especially in young individuals, the contrasts are much less pronounced. Especially in the lighter regions, the color of E. venusta tends to turn green, while in the darker regions it turns brown. Furthermore, the spots on the sides of the abdomen of the females in E. attenuata are much more sharply defined.
credentials
- ↑ a b c Donald Joyce Borror : A Revision of the Libelluline Genus Erythrodiplax (Odonata) [p. 59ff], The Ohio State University, Columbus, 1942