Chlaenius festivus
Chlaenius festivus
Chlaenius festivus is a beetle of the family of beetles and the subfamily Chlaeniinae.
The genus name is Chlaenius AltGr. χλαῖνα chlāīna " jacket " derived and takes on the silky hairs respect, the fact that most species of the genus, including the species described here festivus The species name (Latin festivus, a to ) means " cute ".
Of the 16 European species of the genus Chlaenius Chlaenius spoliatus and Chlaenius velutinus resemble the type Chlaenius very festivus.
Characteristics of the beetle
The beetle is thirteen to sixteen millimeters in size. The top is metallic green, the elytra have a striking pale yellow margin. The body is rounder than that of Chlaenius spoliatus. From below it is visible next to the yellow, hinged side edge of the elytra still a thin yellow stripe, since the outer edge of the abdominal segments yellow is also ( Fig. 2).
The mouthparts pointing forward, the end members of the jaw and labial palpi are truncated wide rounded ( Fig. 1). The forehead between the eyes bulging is relatively wide, about four times as wide as one eye. About the eyes sits just a point pores with a long bristle ( Supraorbitalseta, in Figure 1, left not visible at all and right only piecewise shadowy in the third quarter of the eye about 10 ° to the horizontal ascending ). The eleven-membered yellow antennae are filiform and only from the fourth member densely hairy ( pubeszent ) and therefore darker and dull appearing ( Figure 1, left, the difference between the third and fourth antennal segment is clearly visible ).
The side- rimmed heart-shaped pronotum is entirely gold green or coppery and without yellow margin. He is clear and moderately densely punctured. The rear corners are less blunt than Chlaenius velutinus.
The green elytra are distinctly hairy and according to Matt. The outer edge is provided with a light yellow wide stripes. This is significantly narrowed forward to vigorously trained shoulders ( at Chlaenius spoliatus barely); behind it is even little, not repeatedly widened gradually similar. The elytra are striated by rows of dots on the short row next to the tag ( Scutellarstreif ) followed by eight to nine rows of dots. The intervals between the rows of dots are all the same strongly arched and finely punctured. The margin of the elytra is up to about the elytra narrowing below beaten ( Fig. 2).
The legs are yellow. The tarsi are five-membered. The mandrel at the end of the rear rails being longer than the first half Tarsenglied ( Fig. 4). In the males, the rear three Tarsenglieder on the front legs are square expanded ( Fig. 3).
Biology
The beetle is preferable to find in damp places marshy banks. Beetles and larvae feed predatory. In Hungary, the populations spread rapidly in favorable conditions and in high density populated flooded fields. In a study in Austria, the kind of " Alpine rivers Myricaria germanica " and was in the biotopes " flows with the Ranunculion fluitanits and Callitricho - Batrachion " recorded and counted both times to the beetle species, more or less barren alluvium mostly " directly at the water stop line " happen and" "are specializing in various particle sizes high.
Dissemination
The species is distributed mainly in the eastern Mediterranean. In Spain, the incidence is questionable. In Central Europe the species only in eastern Austria, in Moravia, Slovakia and Hungary occurs. To the east the area of distribution to Asia Minor and the Caucasus expands.