September 23, 2025Open Access

A checklist of xyleborine ambrosia beetles (Coleoptera, Curculionidae, Scolytinae, Xyleborini) on a single fallen chinquapin tree (Castanopsis inermis) from Thailand: with a new species and a new country record

WSWisut SittichayaPrince of Songkla University SSSarah M. SmithLane College NTNarit ThaochanPrince of Songkla University

Key Points

Twenty species of xyleborine ambrosia beetles were identified from a single Castanopsis inermis tree.
Twelve of these species were recorded for the first time from C. inermis, highlighting new biodiversity insights.
A new species, Arixyleborus perbrevis, was described, while Cnestus ater was newly documented from Thailand.
This study enhances understanding of the ecological relationships between xyleborine beetles and their host plants.

Abstract

The tribe Xyleborini comprises over 1,300 species of ambrosia beetles, all of which form mutualistic relationships with fungi. Several beetle species exhibit strong host preferences, particularly within the plant family Fagaceae for genera such as Castanopsis . This study documents the xyleborine beetles associated with Castanopsis inermis in Thailand to improve understanding of their host use and diversity. Twenty species of xyleborine ambrosia beetles were collected from a single fallen Castanopsis inermis tree. Amongst them, twelve species were recorded from C. inermis for the first time. One species, Arixyleborus perbrevis Sittichaya & Smith, sp. nov., is described as new to science, while Cnestus ater (Eggers 1923) is newly recorded from Thailand. Some biological observations on xyleborine ambrosia beetles are also presented.

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