Ambrosiophilus sulcatus (Eggers, 1930)

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Ambrosiophilus sulcatus (Eggers, 1930) Fig. 16A, B, E

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.

Xyleborus sulcatulus Eggers, 1939a: 13. syn. nov.

Xyleborus sinensis Eggers, 1941b: 224. syn. nov.

Type material.

Holotype Xyleborus sinensis (ZMFK). Holotype Xyleborus sulcatus (FRI). Holotype Xyleborus sulcatulus (NHRS).

New records.

China: Jiangxi, Wu-Yi Mt., 19.vii.2017, Lai, S-C, Tian Shang et al. (RABC, 1). India: Bengal [West Bengal], Darjeeling, Debrepani, 6000 ft, 15.ix.1929, J.C.M. Gardner, unknown wood (NMNH, 1). Taiwan: [Formosa], Taiheizan, 9.v.[19]32, L. Gressitt (NMNH, 1). Chiayi Co., Fenkihu, 1370 m, 10-12.iv.1965, C.M. Yoshimoto, B.D. Perkins (BPBM, 1). Vietnam: Hoa Binh, 1940, A. DeCooman (MNHN, 1), Lao Cai, 16 km W of Sa Pa, 1800 m, at light, 17.iii.1998, L. Peregovits, T. Vásárhelyi (RABC, 1).

Diagnosis.

3.4-4.5 mm long (mean = 3.94 mm; n = 5); 2.5-2.87 × as long as wide. This species is distinguished by all declivital interstriae granulate along the entire length; pronotum from dorsal view basic (type 2); pronotal anterior slope rounded; pronotal anterior margin without a row of serrations; pronotum from lateral view tall (type 2); 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 of large size.

Ambrosiophilus sulcatus is variable in body length, the degree of bisulcation of the 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).

Similar species.

Ambrosiophilus atratus , A. caliginestris , A. latisulcatus , 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 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 and should be considered a single morphologically variable species.

Figures

Figure 16. Dorsal, lateral and declivital view of Ambrosiophilus sulcatus holotype, 3.4 - 4.5 mm (A, B, E), and A. wantaneeae holotype, 2.0 - 2.1 mm (C, D, F).