Poecilium lividum
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Poecilium lividum on tree bark |
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| Poecilium lividum | ||||||||||||
| ( Rossi , 1794) |
| Illustrations of Poecilium lividum | |
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| Fig. 1: from the front | |
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| Fig. 2: from above | Fig. 3: from below |
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| Fig. 4: side view | Fig. 5: Head |
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| Fig. 6: Partial view of the underside of the right half, partially colored blue-edged or tinted: extension of the mid-breast edged or tinted yellow: mid-hip |
Fig. 7: Partial view of the wing cover: The longitudinal stripes are just a lighting effect |
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light blue: end of the splint light green: 1st tarsal segment dark green: 2nd tarsal segment orange: 3rd tarsal segment red: 4th tarsal segment ocher: 5th tarsal segment, claw segment |
| Fig. 8: Top view of the hind tarsi, colored below | |
Poecilium lividum (synonym: Phymatodes lividus ) is a beetle from the family of longhorn beetles . The animal, which is rare in Central Europe, is found mainly in Southern Europe. With the reddish pronotum and the blue-black elytra, it resembles a somewhat small specimen of the variable Schönbock ( Phymatodes testaceus ), which is often found in Central Europe.
Description of the beetle
The body is flat and elongated. It reaches a length between five and ten millimeters. He is hairy.
The head (Fig. 5) is much wider than it is long. The mouthparts point forward. As with most longhorn beetles, the eleven-link brown antennae are remarkably long (Fig. 1). In the male they are longer than the body, in the female they are almost as long as the body. The second antenna segment is not extremely short, but rather longer than it is wide (not ring-shaped). In contrast to the similar Phymatodes testaceus, the third antenna segment is significantly longer than the fourth (Fig. 2 and Fig. 3). The kidney-shaped eyes encompass the antennae base from behind; from the front, parts of the eye can be seen above and below the antennae (Fig. 5). The edges of the two eyes are less far apart on the vertex than the bases of the antennae.
The pronotum is rounded on the sides and almost disc-shaped, which is why the genus Phymatodes also bears the German name disc buck. The pronotum is punctured, but has three smooth longitudinal calluses.
The wing covers run parallel and are rounded off together in a semicircle at the end. They are black with a metallic sheen. They are roughly dotted, the spaces between the points are significantly narrower than the points themselves (Fig. 7). Long protruding hairs, as found in related species, are missing.
The slim legs enable quick movement. The joint cavities of the front hips are open to the rear. The front hips are close together and are not separated by the rearward-facing process of the front chest. The middle hips are separated by an extension of the middle chest. This process (in Fig. 6 right half colored blue) only extends to about half of the middle hips (in Fig. 6 right half colored yellow), while it can be significantly longer in related species. The thighs are stalked at the base, thickened club-like towards the tip. The tarsi are apparently four-limbed, the very small fourth limb is hidden in the section of the lobed third tarsal (Fig. 8). The first limb of the hind tarsi is not significantly larger than the second and third limb combined (Fig. 8). The claws are imperforate at the base.
biology
The beetle is crepuscular. The larvae develop in dead branches of various hardwoods (oak, chestnut, beech, elm, willow). The beetle is dragged off again and again in packaging material. The larva eats shallow passages between the bark and wood. For pupation, she places the doll's cradle in the shape of a hook and penetrates the wood. The loophole is very flat elliptical. The adults can be found from April to July. The life cycle is usually two years, but development can also be completed within one year.
distribution
The species is found in southern Europe, Turkey and North Africa. The distribution area extends northeast over Romania and Ukraine to Russia.
literature
- H. Joy, KW Harde, GA Lohse: Die Käfer Mitteleuropas , Vol. 9. Spectrum Academic Publishing House in Elsevier, Munich 1966, ISBN 3-8274-0683-8
Individual evidence
- ↑ Brief information, English
- ↑ Data on Biology, Italian ( Memento of the original from March 4, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Relationship, synonyms and occurrence according to "Fauna Europaea"
