Somatochlora albicincta
| Somatochlora albicincta | ||||||||||||
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Somatochlora albicincta |
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| Scientific name | ||||||||||||
| Somatochlora albicincta | ||||||||||||
| ( Burmeister , 1839) |
Somatochlora albicincta is a species of dragonfly from the family of the falcon dragonflies (Corduliidae), which belong to the large dragonflies (Anisoptera).
features
Construction of the Imago
The males of Somatochlora albicincta reach body lengths between 47 and 49 millimeters, of which 34 to 36.8 millimeters are on the abdomen . The females are slightly larger; they are 49 to 50 millimeters in size and their abdomen measures 35 to 36.4 millimeters. The slim abdomen is brass-colored to black, with the transitions of the segmentation being yellowish. The thickened base and end are hairy. The abdominal appendages are black.
On the hairy brass- green rib cage there are yellowish light points in some individuals. Like the underside of the forehead , the labium on the face is yellowish. The top of the forehead and the vertex are again brass-colored green.
The hind wings measure 29.4 to 31.6 millimeters in the males, while those of the females are somewhat larger and reach 31 to 32.2 millimeters. In contrast to the almost transparent wings of the males, the females are sometimes slightly grayish. The yellow-brown wing mark is two and a half to three and a half millimeters in size in both sexes. The wing triangles are mostly uncrossed and sometimes only crossed on one side of the body. There are seven to eight ante and post nodal loaders .
Construction of the larva
The larva of the Somatochlora albicincta reaches between 20.5 and 23.5 millimeters in length with an abdomen width of 7.2 to eight millimeters. The surface is covered with small hairs which merge into a bristle border at the edges of the tergites . These bristles are slightly smaller than the rest of the hair. On the eighth and ninth segments there are lateral thorns, which are usually slightly shorter than a fifth to a fifth of the segment length. The head is slightly narrower than the abdomen. The joint of the labium extends almost to the coxa of the middle pair of legs. Of the eleven to twelve bristles that occupy the chin, the fourth or fifth bristle is the longest on the outside. The following three or four, however, are very small. There are another five or six bristles on the buttons .
distribution
Somatochlora albicincta occurs in large parts of Canada and in the north of the USA on the west coast in Washington , Oregon and northern California as well as on the west coast in the state of New York .
Habitat and way of life
Both sunny and partially shaded, calm and slow-flowing waters are found as larval habitats . The hatch takes place in June and July. The adult animals hunt for prey just above the water.
Research history
The species was first described in 1839 by Hermann Burmeister using a female from Labrador under the name Epophthalmia albicincta . Hermann August Hagen moved the species to the genus Cordulia in 1861 . Five years later, Samuel Hubbard Scudder gave a description using a male from Canada under the synonym Cordulia eremita . In 1890 the species came to its present location through William Forsell Kirby .
supporting documents
- ↑ Somatochlora albicincta on Dragonflies and Damselflies (Odonata) of the United States , Northern Prairie Wildlife Research Center of the US Geological Survey, accessed February 17, 2010.
literature
- Hermann August Hagen: Synopsis of the Neuroptera of North America [p. 150], Smithsonian institution, 1861, [1]
- Rolla P. Currie: Odonata of the Expedition In: Harriman Alaska Expedition Volume 8 p. 151
- Henrik Steinmann: World Catalog of Odonata (Volume II Anisoptera) [p. 268], de Gruyter, 1997, ISBN 3-110-14934-6
- Philip Garman: Guide to the insects of Connecticut, prepared under the direction of Wilton Everett Britton , Volume 5. pp. 231ff
- James G. Needham: A handbook of the dragonflies of North America pp. 189f , Springfield, Ill., Baltimore, Md., CC Thomas
- James George Needham , Minter Jackson Westfall , Michael L. May : Dragonflies of North America. Revised edition. Scientific Publishers, Gainesville FL 2000, ISBN 0-945417-94-2 .