Erythrodiplax berenice
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Erythrodiplax berenice |
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Erythrodiplax berenice is a species of dragonfly in the genus Erythrodiplax from the subfamily Sympetrinae . It occurs on the Atlantic coast of North America from southern Canada , on the West Indies and in Central America to Venezuela .
features
Construction of the Imago
The animal reaches a length of 28 to 35 mm, of which 15-23 mm is on the abdomen . The hind wings are between 18 mm and 26 mm long. Young animals have a pale face with thick black stripes. The thorax is light yellow and the front and sides are covered with black stripes that join at the end. As with most other species in the genus, the color of the face and thorax changes rapidly to dark blue to black as it ages. This affects the males in particular, while the change in color of the females is less pronounced. The forehead turns a metallic shade of blue. The wings of the females are either clear or have a slight shadow at the base and the nodus . The legs are black. The abdomen is mostly black with pronounced orange and yellow spots on the first through seventh segments. Over time, these spots will disappear. The females have an inverted triangular ovipositor on the ninth segment.
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. The larva has a hairless body except for the prothorax . 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.
Protection status
The Erythrodiplax berenice has protection status G5 worldwide , which means that it is classified as a very widespread and harmless species that occurs in large numbers. She received this status on December 30, 1985 . In the USA it has the national equivalent protection status N5. In Canada, on the other hand, it is rated significantly lower with N2. This means that the population is considered endangered as there are only 6 to 20 sightings or between 1000 and 3000 representatives. Protection status has also been granted at the level of many states in the USA and in the state of Nova Scotia . These are shown in the graphic on the right.
Descriptions
The first description was in 1773 by Drury . Say gave the following description in 1839 :
- " L. berenice [...] Front whitish, steel-blue above; eyes obstuse above and connate; trunk brownish, with two greenish-yellow vittae before, and with three oblique broad and obvious yellow lines each side under the wings; between the wings varied blackish; wings immaculate, or with a tinge of ferruginous at their origin, particularly of the posterior pair, and on the middle; anal membrane blackish; stigma rather large and blackish; feet black; coxar and trochanters yellow; inferior side of the anterior things yellow; abdomen with a dorsal black vitta, including the carina and a lateral black vitta above the lateral carina; lateral carina black; these vittae are more and more widely confluent at the sutures, towards the tip of the abdomen, which is entirelyy black.
- Length from one inch and a half to one inch and three quarters.
- It may be distinguished by the blue top of the frontal vesicle, and the ferruginous mark at the base of the wings. The ferruginous cloud on the middle of the wings is often altogether wanting. It also varies in having no abdominal vittae, excepting a vestige at base. The blue color sometimes extends down to the front. The abdomen is also sometimes blue, and the thorax sometimes black. Durry deschribes the abdomen of the female as yellow, with black annulations and that of the male blue
- The inferior anal process is at least two-thirds the length of the superior ones, wich are arcuated, with a tooth beneath near the tip, and at tip acute.
- A speciem from Dr. Harris. "
Web links
credentials
- ↑ a b http://www.odonatacentral.org/index.php/FieldGuideAction.get/id/46996 (April 3, 2009)
- ↑ 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 Explorer: An online encyclopedia of life. NatureServe, February 2006, accessed March 25, 2006 .
- ↑ Thomas Say : Description of the North American Neuropterous Insects, and Observations on some already described . In: Journal of the Academy of Natural Sciences . 8, 1839, p. 23.