Stenhomalus (Stenhomalus) japonicus (Pic, 1904)
[= Obrium japonicum
[= Stenhomalus lighti
[= Stenhomalus vulcanus
Tsherepanov et Tsherepanova, 1976]
/ Tribus: OBRIINI
[Photo © David Navrátil, click on the picture for 4K resolution]
Stenhomalus japonicus, a species occuring in Russian Far East and Japan, has been described from Sado Island (Niigata Prefecture, Japan) as Obrium japonicum by Maurice Pic in 1904 [❖].
S. japonicus is one of the most taxonomically problematic East Palaearctic species of the Stenhomalini tribe. Taxon was included in the genus Obrium for a long time (followed the original description)
and its true systematic position in Stenhomalus genus (Stenhomalini tribe) as the result of reexamination of holotype was published by Tatsuya Niisato in 2006 [✧]. Moreover, the names
S. lighti Gressitt, 1935 and S. vulcanus Tsherepanov et Tsherepanova, 1976 were suggested as junior synonyms of this taxon [☆][▾].
S. japonicus is a polyphagous species, its larvae develop in dying twigs of many deciduous trees and shrubs. Larvae feed in bark, then subcortically along shoot, plugging gallery deeply impressed on sapwood with a fine frass.
Mature larvae enter the wood at end of gallery (up to 16 cm long), make hook-shaped pupal cell along twig at a depth of 4 - 10 mm and plug inlet with frass. Pupation and hatching during late summer / early autumn, young
beetles overwinter in pupal cells. Life-cycle 2 year [▽].
|Body length:||4.4 - 9 mm|
|Life cycle:||2 years|
|Adults in:||May - August|
|Host plant:||polyphagous in deciduous shrubs and trees (e.g. Cornus, Sydonia, Phellodendron)|
|Distribution:||Russian Far East, Japan|
The depicted beetle was reared from larva found on Mt. Tachibanayama (Fukuoka City environs, Fukuoka prefecture, Kyushu, Japan) in 1967.
Collected by Takahisa Watanabe
Description d'un Obrium du Japon et note de chasse.
Matériaux pour servir à l'étude des Longicornes 5 (1): 22, 1904.
Taxonomic Disorder of Obrium japonicum (Coleoptera, Cerambycidae) and its Allied Species.
Elytra 34 (2): 379-395, 2006.
Niisato T. and Kinoshita T.:
Rediscovery of Stenhomalus japonicus (Coleoptera, Cerambycidae) from Island of Sado of Type Locality.
Elytra 37 (1): 69-70,, 2007.
Little known species of longicorn beetles (Coleoptera: Cerambycidae) from the Russian Far East.
[ Малоизвестные виды жуков-дровосеков (Coleoptera: Cerambycidae) Дальнего Востока России.]
Proceedings of the Russian Entomological Society, St. Petersburg 77: 226–234, 2006.
Cerambycidae of Northern Asia, Volume 2 - Cerambycinae Part I.
Amerind Publishing, New Delhi: 304pp [pages 49-54 as Stenhomalus vulcanus], 1988.
|Subfamilia||Cerambycinae Latreille, 1802|
|Tribus||Obriini Mulsant, 1839|
|Genus||Stenhomalus White, 1855|
|Subgenus||Stenhomalus White, 1855|
|Species||Stenhomalus (Stenhomalus) japonicus (Pic, 1904)|