Erythrodiplax tenuis
| Erythrodiplax tenuis | ||||||||||||
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| Scientific name | ||||||||||||
| Erythrodiplax tenuis | ||||||||||||
| Borror , 1942 |
Erythrodiplax tenuis is a species of dragonfly from the subfamily Sympetrinae . It was described in 1942 by Borror in his revision of the genus and classified in the Basalis group . The species occurs mainly in the upper reaches of the Amazon and its Peruvian and Ecuadorian tributaries. With the species name tenuis , Borror alludes to the animal's narrow, small abdomen.
features
The males between 14.5 and 16.0 millimeters and the females between 14.5 and 16.5 millimeters long, slender abdomen ( abdomen ) is black in both sexes, with the first segments having a light bluish coating. In young animals, the first and second segments are yellow, with a transition to brownish black on the second. The third is again yellow with a black keel. The remaining segments are already black with the exception of yellow spots on the side. The males' abdominal appendages are yellow to dark brown in all ages. The thorax is black and also has a blue tinge. Here, too, young animals are still yellowish with some brown patterns. The black legs have between eight and twelve spines on the femur of the rear pair of legs, whereby these become smaller towards the body. The legs of young animals are yellowish at the base. The head is colored in yellow and brown hues. The wings are transparent except for a small yellowish to brown spot at the base. The spot is missing in the forewings of the males. The wingtips are seldom turned slightly brown. The length of the hind wings in the males is between 16.5 and 18.0 millimeters; in the female between 17.5 and 18.0 millimeters. The wing mark ( pterostigma ) is around 2.2 millimeters in size.
Similar species
Particularly similar to the species are Erythrodiplax andagoya , Erythrodiplax basalis and Erythrodiplax paraguayensis . E. tenuis can be distinguished from the first two by the complete last antenode vein , the non-veined wing triangle and the smaller size. The separation of the males from Erythrodiplax paraguayensis is only possible through the penis structure , that of the females is possible through the coloring of the face.
credentials
- ↑ a b c Donald Joyce Borror : A Revision of the Libelluline Genus Erythrodiplax (Odonata) [p. 120f], The Ohio State University, Columbus, 1942