Megasemum quadricostulatum , a species occuring in Russian Far East, NE China, Japan and Korea, has been described from the East part of Amur valley by Gustav Kraatz in 1879 [▽].
Larvae of M. quadricostulatum develop in standing trunks of dying or dead conifers (Abies is preferred). Young larvae feed subcortically, the later instars create long galleries in wood
plugged compactly with fine frass. Galleries created by last instar larvae are broad, up to 20 to 25 mm in diameter, and sometimes fused into extensive niches plugged with frass. Larvae create
pupal cells at end of galleries in upper layer of wood along trunk. Pupation in early summer, life-cycle at least 2 years. Adults, active from July to early September, are crepuscular / nocturnal
|Body length:||♂♂ 14 - 30 mm / ♀♀ 16 - 35 mm|
|Life cycle:||2 - 3 years|
|Adults in:||July - September|
|Host plant:||polyphagous in coniferous trees (prefers Abies, but also in Picea, Pinus, Larix)|
|Distribution:||Russian Far East, NE China, Japan and Korea|
The depicted mounted male beetle (24 mm) was collected in the Ozernaya (Озерная) river valley
(N43°52′26″ E145°28′56″; Kurils Nature Reserve, Kunashir/Кунаши́р island, Kuril Islands, Yuzhno-Kurilsky district,
Sakhalin region, Russia) on August 26, 2009.
Collected by A. Zaitsev
Ueber die Bockkäfer Ost-Sibiriens, namentlich die von Christoph am Amur gesammelten.
Deutsche entomologische Zeitschrift, Berlin 23 (1): 77-117, 1879.
Cerambycidae of Northern Asia, Volume 1 - Prioninae, Disteniinae, Lepturinae, Aseminae.
Amerind Publishing, New Delhi: 304pp [pages 578-583], 1988.
Longicorn beetles (Coleoptera, Cerambycoidea) of Russia and adjacent countries. Part 1.
Higher School Consulting, Moscow, 550pp [page 366], 2014.