Taxonomic history

Xyleborus sulcatus Eggers, 1930: 180.

Ambrosiodmus sulcatus (Eggers): Wood and Bright, 1992: 680.

Cyclorhipidion sulcatum (Eggers): Maiti and Saha, 2004: 118.

Ambrosiophilus sulcatus (Eggers): Beaver and Liu, 2018: 537.

Synonyms

Xyleborus sulcatulus Eggers, 1939a: 13. Smith et al. 2020b: 71.

Xyleborus sinensis Eggers, 1941b: 224. Smith et al. 2020b: 71.

Diagnosis

3.4−4.5 mm long (mean = 3.94 mm; n = 5); 2.5−2.87 times as long as wide. This species can be distinguished by all declivital interstriae granulate along the entire length; pronotum from dorsal view basic (type 2); pronotal declivity rounded; pronotal anterior margin without a row of serrations; pronotum from lateral view tall (type 2); elytral declivity weakly to strongly bisulcate between striae 1 and interstriae 3; interstriae densely and uniformly granulate, granules on interstriae 3 spaced by a distance of less than the diameter of a granule; interstrial setae long, hair-like; and large size.

Ambrosiophilus sulcatus is variable in body length, the degree of bisulcation of the elytral declivity and in the size of the declivital granules, but all specimens form a continuous spectrum of variation. Specimens from India and China (Fujian) are larger, more strongly bisulcate and have slightly larger granules than specimens occurring further south (Myanmar and Vietnam).

 

May be confused with

Ambrosiophilus atratus, A. caliginestris, A. latisulcatus, and A. satoi

Distribution

China (Fujian, Jiangxi), India (Assam, West Bengal), Myanmar, Nepal, Taiwan, Vietnam

Host plants

recorded only from Artocarpus (Moraceae) (Beeson 1930)

Remarks

The type specimens of Xyleborus sinensis, X. sulcatulus, and type images of X. sulcatus were directly examined. The specimens differ in size (2.8 mm X. sulcatulus, 3.0 mm, X. sulcatus, 4.2 mm X. sinensis), the depth of the elytral declivital sulci, and in the degree development of interstrial granules. Additional non-type specimens were also examined. We found that size, depth of the declivital sulci, and development of interstrial granules formed a continuum of variation.

DNA data

Sequences available for COI and CAD.

COI: MN619838

CAD: MN620131