Etorofus (Etorofus) nemurensis Matsushita, 1933
[= Etorofus variicornis Matsushita, 1933]
[= Strangalia circaocularis Pic, 1934]
[= Pedostrangalia circaocularis Pic, 1934]
[= Leptura circaocularis (Pic, 1934)]

Subfamilia: LEPTURINAE  /  Tribus: LEPTURINI
Etorofus nemurensis
[Photo © Maxim E. Smirnov, click on the picture for 4K resolution]

Etorofus nemurensis, a Pacific-insular coniferous forest species occuring in Japan (Hokkaido) and Russian Far East islands (Kurils, Sakhalin), has been described from Hokkaido as Etorofus variicornis var. nemurensis by Masaki Matsushita in 1933 [▽]. The larvae develop in the decaying wet coniferous wood (e.g. fallen, uprooted trees or logs cast ashore on sea coast), spruce Picea and fir Abies are the preferred host trees. Larvae create galleries along trunk plugged with frass, sometimes galleries merge to form considerable niches in wood entirely plugged with frass. After second or third overwintering larvae create pupal cell in wood plugged with coarse fibrous frass and pupate in early summer. Life cycle 2 - 3 years. Adults, active from late June to early September, are diurnal and anthophilous [❖][✧].

The Etorofus status as an independent genus and relationship to the genus Pedostrangalia, as well as status and validity of its subgenera (Etorofus, Nakanea) is unclear and is the subject of much discussion, professional controversy and frequent changes [✩][❖].

Body length:♂♂ 12.5 - 15 mm / ♀♀ 14.5 - 19 mm
Life cycle:2 - 3 years
Adults in:June - September
Host plant:polyphagous in coniferous trees (Picea, Abies)
Distribution:Russian Far East, Japan

The depicted beetles were collected in Stolbovskie thermal springs (Столбовские термальные источники) environs (2 km south of Cape Stolbchaty, Kunashir Island, Kuril Islands, Sakhalin oblast, Far Eastern federal district, Russia) on July 27, 2008.

Collected by Igor V. Melnik

Matsushita M.:
Beitrag zur Kenntnis der Cerambyciden des japanischen Reichs.
Journal of the Faculty of Agronomy of Hokkaido Imperial University, Sapporo 34 (2): i-ix + 157-445, 1933. [download pdf icon]

Danilevsky M.L.:
Longicorn beetles (Coleoptera, Cerambycoidea) of Russia and adjacent countries. Part 1.
Higher School Consulting, Moscow, 550pp [pages 300-301], 2014. [download pdf icon]

Cherepanov A.I.:
Cerambycidae of Northern Asia, Volume 1 - Prioninae, Disteniinae, Lepturinae, Aseminae.
Amerind Publishing, New Delhi: 304pp [pages 467-521 as Leptura circaocularis], 1988. [download pdf icon]

Danilevsky M.L.:
Additions and corrections to the new Catalogue of Palaearctic Cerambycidae (Coeloptera) edited by I. Löbl and A. Smetana, 2010. Part III.
Munis Entomology & Zoology Journal 7 (1): 109-171, 2012. [download pdf icon]

SubfamiliaLepturinae Latreille, 1802
TribusLepturini Latreille, 1802
GenusEtorofus Matsushita, 1933
SubgenusEtorofus Matsushita, 1933
SpeciesEtorofus (Etorofus) nemurensis Matsushita, 1933