Isotomus speciosus (Schneider, 1787)
ssp. gilanus (Pic, 1911)
[= Isotomus comptus maculicollis Holzschuh, 1989]
[= Isotomus comptus gilanus (Pic, 1911)]

Subfamilia: CERAMBYCINAE  /  Tribus: CLYTINI

Isotomus speciosus gilanus
[Photo © Michal Hoskovec, Fuji Superia 400 35 mm film scan]

Isotomus speciosus gilanus, an endemic subspecies to North Iran, has been described by as Caloclytus comptus v. gilanus by Maurice Pic in 1911 [✧]. It was errorneously described again as Isotomus comptus maculicollis by Carolus Holzschuh in 1989 [❖]. According to Pierpaolo Rapuzzi and Gianfranco Sama (2018), however, it is a subspecies of the widespread taxon Isotomus speciosus (Schneider, 1787) [▽]. Both the nominate form and the subspecies are highly polyphagous on deciduous trees. The limiting factor is very low moisture of the substrate. Therefore, mainly dead trees growing on S facing slopes are selected for oviposition. The species develops gregariously and in one dead trunk larvae in different instars as well as pupae and adults might be found at one time. The length of development decidedly depends on the substrate quality but in average it is 2 years. The adults are found on dead wood especially in the late afternoon.

Body length:12 - 24 mm
Life cycle:at least 2 years
Adults in:June - August
Host plant: polyphagous on deciduous trees (Carpinus, Castanea, Quercus, Fagus, Ulmus etc.)
Distribution:an endemic subspecies to North Iran

The depicted beetles were reared from a pupa collected in Carpinus in Golestan forest 45 km NE Minudast (prov. Khorasan, North Iran).

Collected by Martin Rejzek

Pic M.:
Notes diverses et diagnoses.
Matériaux pour servir à l'étude des Longicornes 8 (1): 3-9, 1911. [download pdf icon]

Holzschuh C.:
Beschreibung neuer Bockkäfer aus Europa und Asien (Cerambycidae, Col.).
Koleopterologische Rundschau, Wien 59: 153-183, 1989. [download pdf icon]

Rapuzzi P. and Sama G.:
New taxa and notes on the systematic of palearctic Longhorn-Beetles (Coleoptera: Cerambycidae).
Munis Entomology & Zoology 13 (1): 1-39, 2018. [download pdf icon]

Isotomus speciosus gilanus
[Photo © Michal Hoskovec]
Isotomus speciosus gilanus
Isotomus speciosus gilanus
Isotomus speciosus gilanus
[Photo © Martin Rejzek]
Isotomus speciosus gilanus
[Photo © Martin Rejzek]

SubfamiliaCerambycinae Latreille, 1802
TribusClytini Mulsant, 1839
GenusIsotomus Mulsant, 1863
SpeciesIsotomus speciosus (Schneider, 1787)
SubspeciesIsotomus speciosus gilanus (Pic, 1911)