Chaetopteroplia segetum
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Chaetopteroplia segetum |
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| Chaetopteroplia segetum | ||||||||||||
| ( Autumn , 1783) |
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| Fig. 1: female | Fig. 2: side view |
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| Fig. 3: Rear rail from below |
Fig. 4: Elytric border of the right wing cover |
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| Fig. 5: Claws of the right side I on the front leg, above male, below female II on the middle pair of legs, III on the hind leg |
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Chaetopteroplia segetum (including cereals chafer ) is a beetle from the family of Rutelidae belonging to the superfamily of Scarab Beetle belongs. The species is represented in Europe with six subspecies , of which only the nominate form Chaeteroplia segetum segetum occursin Central Europe. The species was previously assigned to the genus Anisoplia , but separated from it due to sexual morphological features (asymmetrical parameters ).
Notes on the name
The beetle was first described by Herbst in 1783 under the name Melolontha segetum . The description begins with the words This one most often sits on the ears of corn and is therefore also called corn worm here in this country . This explains the species name segetum ( Latin for "the seeds").
The generic name Chaetopteroplia goes back to Medvedev in 1949. He says that the wing covers are covered with bristles ( give a wiki. Χαίτη Chaite "bristle" and πτερόν pteron "wings", fig. 4).
Characteristics of the beetle
The nine to thirteen millimeters large body is broadly oval. The upper side is dense and long white-gray or yellowish hairy, on the wing-coverts the hair is weaker. The head, pronotum and shield are blackish green to pure black, the wing covers brownish.
Males and females differ in a number of characteristics. The males have a goatee, the antennae are longer, and the inner front claw is thickened (Fig. 5 I). In females, the elytra are paler in color and have a callus on the side edge. In addition, the label is embedded in a dark spot (Fig. 1).
The head is directed forward. The forehead is tightly dotted . The wrinkled head shield is elongated like a snout, pinched off in front of the tip and bent up. In supervision he covers the mouthparts . The antennae are nine-part, the antenna compartment consists of three leaves that can move freely against each other.
The pronotum is narrower than the elytra, arched and rather densely punctured. It is hemmed in skin on the front. It is less rounded on the sides in the male, more rounded outward in the female and slightly narrower at the front edge than at the base. Its rear corners are obtuse and rounded. The base is edged.
The black and green label appears white because of the thick hair,
The wing covers are only sparsely hairy except around the tag and towards the end. The outer edge has a row of long, protruding bristles (Fig. 4), from which the genus owes its name. They arise from a low point next to which there is a grain. Indistinct ribs run on the wing covers.
The front hips are keeled transversely near the front edge. The front rails have two teeth on the outside and a movable mandrel on the inside. In the male, this is opposite the rear external tooth, in the female in front of it. At the end, the middle and rear rails have two thorns approaching each other, the tarsi are bent next to them, not between them (Fig. 3). The tarsi are five-part. The claws are of different lengths, the claw on the outside of the middle and rear pair of legs and correspondingly on the inside of the front leg is much stronger, flat, mobile and in the outer third is partially split towards the second claw, the second claw is shorter and significantly narrower (Fig. 5 ).
The underside is dense light gray to white, long and softly hairy. (Fig. 1).
biology
The development takes two years. The larvae live in the ground and eat grass and other roots, the adults appear from April to July, in warmer countries April to June. They eat the flowers, later the milk-ripe grains of grass species, but also, for example, flowers on fruit trees and can also be harmful in the process.
distribution
The nominate the type is right the same places often left the same rare and some regions missing. The species extends in Central, Eastern and Southeastern Europe from France to Greece , and Asia Minor to Syria , north of it to Siberia . It is absent in Northern Europe, Great Britain , the Iberian and the Apennine Peninsula . The center of the spread of the warmth-loving species is in the lower elevations of Central Europe.
literature
- Heinz joy , Karl Wilhelm Harde , Gustav Adolf Lohse (ed.): The beetles of Central Europe . tape 8 . Teredilia Heteromera Lamellicornia . Elsevier, Spektrum, Akademischer Verlag, Munich 1969, ISBN 3-8274-0682-X .
Individual evidence
- ↑ Edmund Reitter : Fauna Germanica, the beetles of the German Empire. Volume II, KG Lutz 'Verlag, Stuttgart 1909, plate 74 Fig. 17.
- ↑ a b Chaetopteroplia segetum in Fauna Europaea. Retrieved February 10, 2011
- ↑ Gustav Adolf Lohse, Wilhelm H. Lucht: Die Käfer Mitteleuropas . tape 13 , 2nd supplement volume with catalog section. Goecke & Evers, Krefeld 1992, ISBN 3-87263-043-1 , pp. 248 .
- ^ Johann Friedrich Wilhelm Herbst: Critical directory of my insect collection in the archive of insect history 4th issue, Zurich 1783, p. 15 ( biodiversitylibrary.org ).
- ↑ Sigmund Schenkling: Explanation of the scientific beetle names.
- ↑ a b Polish coleopterological website
