Xylotrechus (Xylotrechus) ibex (Gebler, 1825)
[= Xylotrechus rectangulus Pic, 1902]

Subfamilia: CERAMBYCINAE  /  Tribus: CLYTINI
Xylotrechus ibex
[Photo © Adam Woźniak]

Xylotrechus (Xylotrechus) ibex, a beautiful species of North-Eurasian forest belt rare in Central Europe, has been described from Altai Mts. (Russia) as Clytus ibex by Friedrich August Gebler in 1825 [✳]. It must be confirmed whether the western and eastern populations belong to the same taxon. Recent studies show that European populations are ecologically associated primarily with alder (Alnus spp.) [❖]. Beetles are found in forests with a large share of alder, but also in other habitats, for example in riverside and roadside tree stands. Development takes place mainly in the trunks of thick trees. They occur on living trees - sometimes they develop in them for many generations for many years, as well as in dying and recently withered trees. The larvae feed mainly in the thick bark, less often under the bark and shallowly in the wood. The development cycle is one or two years. Adults have a relatively long period of appearance - from mid June to mid August. The swarm takes place in sunny, hot weather. The species excels in variable coloration, the elytrae toment pattern can be both white and yellow, especially in males.

Most likely, in Northern and Central Europe, this interesting species is much more common than it seems. Until the end of the 20th century, in Poland it was considered a great rarity. Nowadays, when its biology and ecological requirements are better known, Xylotrechus ibex is found more and more often in new places in various parts of the country. More about biology of this remarkable beetle you can find in the dedicated page.

Body length:6 - 24 mm
Life cycle:1 - 2 years
Adults in:June - August
Host plant:in Europe mainly alder (Alnus spp.)
Distribution:Eurasia - the exact distribution of the species requires thorough research

Depicted mounted beetles were reared from dead alder (Alnus glutinosa) found in Las Bielański (Warszawa, Masovian voivodeship, Poland) in 2017. The living specimens were: (AW) - reared from pupa (♀) / larva (♂) found in the same locality in years 2017 and 2020, respectively. The couple in copula was collected near Płock (Masovian voivodeship, Poland) in August 2020.

Collected by our friends Adam Woźniak and Marcin Szewczyk

Gebler F.A.:
IV. Coleopterorum Sibiriae Species Novae.
Essais Entomologiques 4: 42-57, 1825. [download pdf icon]

Tatur-Dytkowski J., Górski P., Stepień S.:
Nowe dane o interesujących kózkowatych Warszawy (Coleoptera: Cerambycidae).
[New data on interesting longhorn beetles of Warsaw (Coleoptera: Cerambycidae).]
Wiadomości Entomologiczne 39 (1): 11-16, 2020. [download pdf icon]

Xylotrechus ibex
Xylotrechus ibex
[Photo © Marcin Szewczyk]
Xylotrechus ibex
[Photo © Marcin Szewczyk]
Xylotrechus ibex
Xylotrechus ibex
Xylotrechus ibex
[Photo © Adam Woźniak]

SubfamiliaCerambycinae Latreille, 1802
TribusClytini Mulsant, 1839
GenusXylotrechus Chevrolat, 1860
SubgenusXylotrechus Chevrolat, 1860
Species Xylotrechus (Xylotrechus) ibex (Gebler, 1825)