Taxonomic history

Xyleborus atratus Eichhoff, 1876a: 201.

Ambrosiophilus atratus (Eichhoff): Hulcr and Cognato, 2009: 22.


Xyleborus collis Niisima, 1910: 12. Smith et al., 2018b: 392.


3.3−3.5 mm long (mean = 3.46 mm; n = 5); 2.75−2.92 times as long as wide. This species can be distinguished by all declivital interstriae granulate along the entire length; pronotum from lateral view long (type 8); declivital striae 1 and 2 moderately to strongly impressed; interstriae moderately and uniformly granulate, granules on interstriae 3 spaced by a distance of 2−3 diameters of a granule; interstrial setae long, hair-like; and large size.

May be confused with

Ambrosiophilus caliginestris, A. satoi, and A. sulcatus


China (Chongqing, Fujian, Shanxi), Japan, South & North Korea, Taiwan. Introduced to Europe and North America (Atkinson et al. 1990; Faccoli 2008; Gomez et al. 2018a).

Host plants

polyphagous (Faccoli 2008, Beaver and Liu 2010)


Kasson et al. (2016) have shown that the symbiotic association of the species with the fungus, Flavodon ambrosius, has allowed niche expansion with large, long-lived, interconnecting colonies, overlapping generations, and pre-dispersal oviposition by young females.

DNA data

Sequences available for COI and CAD.

COI: HM064120.1

CAD: HM064298.1