Brachyta (Brachyta) interrogationis (Linnaeus, 1758)
ssp. eitschbergeri Danilevsky et Peks, 2015

Subfamilia: LEPTURINAE  /  Tribus: RHAGIINI

Brachyta interrogationis eitschbergeri
[Photo © Daniel Rydzi]


Brachyta interrogationis (Linnaeus, 1758) has been described as Lepura from "Europa", but according to the original description (L. nigra, elytris lividis: facia longitudinale arcuata maculisque quator nigris") it was rather pale form distributed in Scandinavia. So the type locality of the species is situated in Scandinavian Peninsula, where all populations consist moderately pale forms. All West-European populations consist predominant dark specimens, which are very rare in East European populations and unknown in Caucasus and Khazakstan. This situation resulted in the description of Brachyta interrogationis eitschbergeri from Bavaria by Mikhail Danilevsky and Heinz Peks in 2015 [▽]. This subspecies is characterized by almost totally dark elytra in both sexes. Only small lateral yellow elytral spots are usually present with narrow yellow line along suture often protruding around elytral apices (specimens without any yellow areas are also known). B. i. eitschbergeri occurs in Germany (Bavaria, Saxony) and West Bohemia (Czechia). Populations from South Tirol, France, Switzerland and South Germany (Alps regions) are now considered as a valid subspecies Brachyta interrogationis marginella (Fabricius, 1793). The Slovak populations with almost equal proportion of dark and pale forms were described from Velká Fatra as Brachyta interrogationis gabzdili by Mikhail Danilevsky and Heinz Peks in 2016 [✧].

The B. i. eitschbergeri inhabits mountain meadows, forest edges or mountain forest clearings with rich vegetation. Females lay eggs in the soil around the roots of food plants (Geranium sylvaticum) in which larvae develop. The larvae pupate in autumn and the adults overwinter in the soil, the life-cycle is 1 - 2 years. Adults, active from June to July, are diurnal and anthophilous (in Bohemia they can be found especially on flowering Geranium).

Body length:♂♂ 10 - 13 mm / ♀♀ 11 - 15 mm
Life cycle:1 - 2 years
Adults in:June - July
Host plant:Geranium sylvaticum
Distribution:Germany (Bavaria, Saxony) and West Bohemia (Czechia)


The depicted living beetle were collected on the host plant, wood cranesbill (Geranium sylvaticum), in environs of mountain villages Horní Blatná and Kovářská (800-900 m a.s.l., Krušné Mts., NW Bohemia, Czechia) on June 8, 2019 and June 5, 2015, respectively.

Photographed by Daniel Rydzi and Pavel Krásenský


[▽]
Danilevsky M.L. and Peks H.:
Brachyta interrogationis eitschbergeri ssp. n. (Coleoptera, Cerambycidae) - black subspecies from south-east Germany.
Humanity space - International Almanac 4 (5): 1085-1089, 2015. [download pdf icon]

[✧]
Danilevsky M.L. and Peks H.:
Subspecific structure of Brachyta interrogationis (Linnaeus, 1758) (Coleoptera, Cerambycidae) in West Europe with a description of a new subspecies.
Humanity space - International Almanac 5 (2): 178-182, 2016. [download pdf icon]


Brachyta interrogationis <strong></strong>
Brachyta interrogationis eitschbergeri
Brachyta interrogationis <strong></strong>
[Photo © Pavel Krásenský]

Brachyta interrogationis eitschbergeri
[Photo © Daniel Rydzi]



 
SubfamiliaLepturinae Latreille, 1802
TribusRhagiini Kirby, 1837
GenusBrachyta Fairmaire in Jacquelin du Val, 1864
SubgenusBrachyta Fairmaire in Jacquelin du Val, 1864
SpeciesBrachyta (Brachyta) interrogationis (Linnaeus, 1758)
SubspeciesBrachyta (Brachyta) interrogationis eitschbergeri Danilevsky et Peks, 2015