Somatochlora graeseri
| Somatochlora graeseri | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Somatochlora graeseri | ||||||||||||
| Selys , 1887 |
Somatochlora graeseri is a species of dragonfly from the family of falcon dragonflies (Corduliidae), which belong to the large dragonflies (Anisoptera). It is common in Asia from Japan to the Urals.
features
Characteristics of the imago
The dragonflies are medium-sized, the abdomen of the males is 33 to 38 millimeters, that of the females 34 to 35 millimeters. The body is greenish-black in color with a hairy, bright metallic green thorax without yellow spots and a black abdomen. The forehead ( frons ) has a yellow spot on both sides.
The forewings have between the cubital and anal vein a cross artery. In the females in particular, the wing color is variable. With them, the wing base can be colorlessly transparent or colored with a weak yellowish basic color, which can take up up to a third of the wing surface. The dull black abdomen of the males shows a small yellow side spot on the 2nd and a larger segment on the 3rd. The cerci of the male are twice as long as the 10th segment and strongly bulged on the sides and underside. The subgenital plate of the female is broad and distally rounded, it is about as long as the 9th abdominal segment.
Characteristics of the larvae
The adult larva and the exuvia reach a length of about 19 millimeters and are similar to those of the shiny emerald dragonfly ( Somatochlora metallica ). The larva has back spines on segments S4 to S9, the spines on the 3rd segment are missing or only indicated and small on the 4th segment, side spines exist on the 8th and 9th segment. The anal pyramid is short.
distribution and habitat
Somatochlora graeseri has a very large Asian distribution area as well as individual isolated occurrences up to the eastern border of Europe in the southern Urals in the area of the Belaja in Bashkortostan . The main distribution area extends from the Yenisei and the Altai to East Asia in Japan to the extreme east of Hokkaidō and includes Kamchatka , Sakhalin and the Kuriles . In the area of the West Siberian lowlands it has a large distribution gap , it is absent in the well-researched province of Novosibirsk and in Mongolia , but was found south of it in the Republic of Tuva in South Siberia , in the southeast of Russian- Transbaikal, as well as in northeast China and in the north Korea proven.
The dragonfly lives in Japan in the area of cool swamps and shady small bodies of water, while in Siberia it occurs in the area of stagnant as well as slowly flowing bodies of water in forest, meadow and mountain regions. In the Altai, there are known sites at over 2,000 meters above sea level.
Way of life
The flight time of the dragonfly is very dependent on the observation region. It flies in the Urals between May and August while in the Altai it only flies between July and August.
literature
- Hansruedie Wildermuth: Europe's falcon dragonflies. Neue Brehm-Bücherei Volume 653, Westarp Sciences Hohenwarsleben 2008. pp. 434-436, ISBN 978-3-89432-896-2 .
- Sang-Bum Kim, Hong-Shik Oh, Won-Tack Kim, Osamu Tadauchi: Phenetic Analysis of the Anisoptera (Insecta: Odonata) in Jeju Island, Korea, Based on Morphological Characters. J. Fac. Agr., Kyushu Univ. 54 (1), 2009; Pp. 123-132. ( PDF )