Xylotrechus (Rusticoclytus) pantherinus (Savenius, 1825)
[= Rusticoclytus pantherinus (Savenius, 1825)]

Subfamilia: CERAMBYCINAE  /  Tribus: CLYTINI
Xylotrechus pantherinus
[Photo © Daniel Rydzi]

Xylotrechus pantherinus, a widely distributed Palaearctic species, has been described from Finland as Clytus pantherinus by Savenius in 1825 [▽]. X. pantherinus is a species occuring typically at the edges of forest stands, unmaintained areas of former agricultural land, abandoned quarries, etc. Larval development in the living wood of Salix caprea, however, species prefers partially weakened trees, damaged by e.g. Saperda similis/Aromia moschata or mechanically damaged trees. It mainly attacks branches with a diameter of 2 - 6 cm, exceptionally thicker (up to 10 cm). The female lays preferentially on parts with scraped bark. The larvae soon enter the wood where they feed and create a relatively long larval gallery. Before pupation, it creates out an exit hole covered with bark, or in barkless areas covered only with a thin layer of wood. Life-cycle 2 or often 3 years (depends on locality). Several generations can develop in the same tree. Adults, active from June to August (peak in the beginning of July), can be found on bark of the host trees. X. pantherinus adults not visit the flowers [✧][❖].

Xylotrechus pantherinus was considered a very rare species in Central Europe for decades. However, it is rather an overlooked species due to its hidden way of life, which is very difficult to catch as an adult. However, it can be obtained much more easily by rearing from larvae or pupae.

Body length:10 - 21 mm
Life cycle:2 - 3 years
Adults in:June - July
Host plant:Salix caprea in Europe and Salix fragilis, Salix sibirica and Salix xerophila in Siberia
Distribution:Austria, Belarus, Czechia, Finland, France, Germany, Hungary, Italy, Lithuania, Norway, Poland, Romania, Russia, Slovakia, Sweden, North China, Mongolia, Kazakhstan

The depicted beetle in was reared from larva collected in a living goat willow (Salix caprea) in Vyškov environs (South Moravia, Czechia) in February 2022.

Collected by Daniel Rydzi

Savenius in Hummel A.D.:
Insectes de 1824 - Novae Species.
Essais Entomologiques 4: 1-72, 1825. [download pdf icon]

Sláma M.E.F.:
Tesaříkovití – Cerambycidae České republiky a Slovenské republiky / Cerambycidae of the Czech Republic and Slovak Republic.
Milan Sláma private printing, Krhanice, 383pp [pages 165-166], 1998 [ISBN: 80-238-2627-1]. [download pdf icon]

Cherepanov A.I.:
Cerambycidae of Northern Asia, Volume 2 - Cerambycinae Part II.
Amerind Publishing, New Delhi: 354pp [pages 13-18], 1988. [download pdf icon]

Xylotrechus pantherinus
[Photo © Daniel Rydzi]

SubfamiliaCerambycinae Latreille, 1802
TribusClytini Mulsant, 1839
GenusXylotrechus Chevrolat, 1860
SubgenusRusticoclytus Vives, 1977
Species Xylotrechus (Rusticoclytus) pantherinus (Savenius, 1825)