Trirachys
Eastern Trirachys
CerambycinaeCerambycini ⚘ Pollinator
European spp.
4
Body length
20–45 mm
Activity
Diurnal
Flight season
Summer–Autumn
Overwinters as
larva
Larva type
MRTVE_TV
Biotope
forest-saproxylic
Overview
Trirachys
*Trirachys* Randall, 1838 is a small to medium-sized longhorn beetle genus (20–45 mm) of the subfamily Cerambycinae, distributed across East Asia, with records from China and Japan at altitudes ranging from sea level to 1000 m. The adults are characterised by filiform to slightly serrate antennae and variable coloration, sometimes forming striking patterns. Larvae develop subcortically and into the wood of dead or dying broadleaved trees, principally oaks (*Quercus*) and elms (*Ulmus*), over one to three years. Adults are diurnal to crepuscular and may be attracted to fresh dead wood and UV light.
Seasonal activity
Flight season: Summer–Autumn
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Green = active months · Orange = peak
Host plants
Primary hosts: oak broadleaf
QuercusUlmus
⚑ Conservation note: none