Erythrodiplax minuscula
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A male of the Erythrodiplax minuscula |
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| Scientific name | ||||||||||||
| Erythrodiplax minuscula | ||||||||||||
| ( Rambur , 1842) |
Erythrodiplax minuscula or Erythrodiplax connata minuscula is a dragonfly species of the genus Erythrodiplax from the subfamily Sympetrinae . It occurs in the east of the USA and Argentina .
features
Construction of the Imago
The animal reaches a length of 22 to 27 mm, of which 14 to 17 mm is on the abdomen . The hind wings are between 15 and 21 mm long. Young animals of both sexes are either green-brown or olive-colored. The front of the head is also kept in olive. The underside of the thorax is free of decorations such as stripes and other patterns, but it is darker than the sides. The wings are transparent, but can have a slight shadow on the body. Adults are mostly ash blue. The segments 7 to 10, however, are black. The male's cerci is almost white and the female's triangular ovipositor is in segment 9.
Construction of the larva
The monochrome larva reaches a size of 15 to 16 mm. The round eyes are arranged laterally at the bottom of the head and the abdomen ends rather bluntly. With the exception of the prothorax, the larva has a hairless body. The head is longer than the thorax with four notches on the lower jaw. The molar tooth formula is (2-4), but always without a molar dam. The third segment of the antennas is the longest. The paired side plates (ventrolateral plates) of the eleventh abdominal segment , the so-called paraproct , are smooth when viewed from the side.
Reproductive behavior
The mating takes place relatively quickly with 20 s, after which the females lay the eggs. When laying the eggs, the male guards the female by buzzing around the pond , as is common in the genus Erythrodiplax .
Similar species
In addition to the similarity to some representatives of the same genus such as Erythrodiplax basifusca and Erythrodiplax fusca , from which it can be distinguished by its ash-blue color at the latest as an adult, the E. minuscula can also be confused with the Libellula deplanata . However, this has brown stripes at the base of the wings.
Protection status
The Erythrodiplax minuscula has the protection status G5 worldwide , which means that it is classified as a very widespread and non-endangered species that occurs in large numbers. She received this status on December 30, 1985 . In the USA it is not classified nationally, but at the level of the eastern states. These are shown in the graphic on the right.
Naming
The species was first described as Libellula minuscula in 1842 by Rambur .
Web links
credentials
- ^ A b Henrik Steinmann: World Catalog of Odonata (Volume II Anisoptera) [p. 450], de Gruyter, 1997, ISBN 3-110-14934-6
- ↑ a b c http://odonatacentral.bfl.utexas.edu/fieldguide/species.asp?taxaid=258 ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. (April 13, 2006)
- ↑ Jerrell James Daigle: Florida Dragonflies (Anisoptera): A Species Key to the Aquatic Larval Stages . In: Technical Series . 12, No. 1, November 1992, p. 23.
- ↑ Muzón and Garré: Description of the last instar of Erythrodiplax paraguayensis (Aniosoptera: Libellulidae) . In: Rev. Soc. Entomol. Argent . 64, 2005, pp. 85-91.
- ↑ NatureServe (ed.): NatureServe Explorer: An online encyclopedia of life. February 2006, accessed March 15, 2006 .
