Megasemum quadricostulatum Kraatz, 1879

Subfamilia: SPONDYLIDINAE  /  Tribus: ASEMINI
Megasemum quadricostulatum
[Photo © Kirill V. Makarov, click on the picture for 4K resolution]

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

Kraatz G.:
Ueber die Bockkäfer Ost-Sibiriens, namentlich die von Christoph am Amur gesammelten.
Deutsche entomologische Zeitschrift, Berlin 23 (1): 77-117, 1879. [download pdf icon]

Cherepanov A.I.:
Cerambycidae of Northern Asia, Volume 1 - Prioninae, Disteniinae, Lepturinae, Aseminae.
Amerind Publishing, New Delhi: 304pp [pages 578-583], 1988. [download pdf icon]

Danilevsky M.L.:
Longicorn beetles (Coleoptera, Cerambycoidea) of Russia and adjacent countries. Part 1.
Higher School Consulting, Moscow, 550pp [page 366], 2014. [download pdf icon]

SubfamiliaSpondylidinae Audinet-Serville, 1832
TribusAsemini Thomson, 1860
GenusMegasemum Kraatz, 1879
SpeciesMegasemum quadricostulatum Kraatz, 1879