Erythrodiplax venusta
| Erythrodiplax venusta | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Erythrodiplax venusta | ||||||||||||
| ( Kirby , 1897) |
Erythrodiplax venusta is a species of dragonfly from the subfamily Sympetrinae . It was described by Kirby in 1897as Micrathyria venusta . Since Borror's revision of the genus, it has beenassigned tothe venusta group. The species is mainly found in the Amazon and the Guyanas . But it also occurs in the southern parts of Colombia and along some southern tributaries of the Amazon.
features
The abdomen, which is between 20.5 and 23.0 millimeters long in the males and between 21.0 and 22.0 millimeters long in the females, is patterned, like the rest of the animal, from dark brown to black and greenish-yellow. The thorax is still greenish yellow in young animals. The yellow basic color is accompanied by dark, brownish to 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 dark brown with two yellowish to yellowish brown spots at the base of the antennae . The mouthparts are yellow. The hind wings are between 23.0 and 25.5 millimeters in the males; in the female between 24.5 and 26.0 millimeters long and have a wing mark up to 3.0 millimeters in size ( pterostigma ). There are two different types of wing patterning. By far the most common shape consists of a reddish brown basal spot and a lighter postnodal band. The second variant consists only of a smaller basal spot.
Similar species
The species is particularly similar to Erythrodiplax attenuata . In addition to the differences in the penis structure, the color or pattern is different. In E. attenuata , especially in young individuals, the contrasts are much more pronounced. Especially in the lighter regions, the color of E. attenuata turns more yellowish, while it slides into black in the darker regions. 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. 63f], The Ohio State University, Columbus, 1942