Ambrosiophilus papilliferus, Smith & Beaver & Cognato, 2020

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 papilliferus sp. nov. Fig. 15A, B, I

Type material.

Holotype, female, 贵州 平塘 核桃 1981.VI.6 采集者 ：罗禄怡 [China: Guizhou, Pingtang, 6.vi.1981, Luyi Luo, ex Carya sp.] (NMNH). Paratype, female, Vietnam: Thua Thien-Hue, Bach Ma N.P., 16.18902, 107.8498, 1193 m, 15.ii.2017, VN54, A.I. Cognato, T.A. Hoang, ex 1-4 cm diameter branch (MSUC).

Diagnosis.

2.5 mm long (n = 1); 2.5 × as long as wide. This species is distinguished by declivital interstriae 1 unarmed, interstriae 2 armed by four or five moderately sized and variably spaced denticles along its length, interstriae 3 armed by five larger denticles; declivital striae 1 and 2 moderately impressed; and pronotum from dorsal view basic (type 2), lateral view basic (type 0).

Similar species.

Ambrosiophilus osumiensis , A. wantaneeae .

Description

(female). 2.5 mm long (n = 1); 2.5 × as long as wide. Body color red-brown, antennae and legs light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface subshiny, punctate; punctures moderately dense, becoming shallower and sparser on reticulate upper part. Eyes deeply emarginate just above antennal insertion, upper part smaller than lower part. Submentum narrow, triangular, slightly impressed. Antennal scape regularly thick, shorter than club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club tall and oval, flat, type 3; segment 1 convex and small on anterior face, occupying approximately basal 1/6; segment 2 corneous, narrow; segments 1-3 present on posterior face. Pronotum: 0.79 × as long as wide. In dorsal view basic, type 2, sides parallel in basal 1/2, rounded anteriorly; anterior margin without serrations. In lateral view basic, type 0, disc flat, summit pronounced. Anterior slope with widely spaced, small coarse asperities, becoming lower and more strongly transverse towards summit. Disc subshiny with moderately dense small, shallow punctures bearing short, fine, erect hair-like setae, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Elytra: 1.64 × as long as wide, 2.1 × as long as pronotum. Scutellum moderately sized, linguiform, flush with elytra, flat, shiny. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 3/4, then broadly rounded to apex. parallel-sided in basal 3/4, then broadly rounded to apex. Disc opalescent, striae weakly impressed, with moderately coarse, shallow, and irregular punctures separated by 0.5-1 diameter of a puncture, glabrous; interstriae flat, finely punctate, punctures more widely separated than those of striae, with fine, erect hair-like setae. Declivity steep, strongly convex, shagreened; strial punctures larger than on disc, striae 1 and 2 moderately impressed, strial punctures bearing short, recumbent setae 1 × width of a puncture; interstriae 1 unarmed by granules, interstriae 2 with four or five coarse granules, interstriae 3 and 4 with four or five slightly smaller granules, each granule with a moderately long, erect hair. Posterolateral margin carinate to interstriae 7. Legs: procoxae contiguous, prosternal coxal piece short, pointed. Protibiae slender, obliquely triangular, broadest at apical 1/3; posterior face smooth; apical 1/2 of outer margin with six large socketed denticles, their length longer than basal width. Meso- and metatibiae flattened, outer margins evenly rounded with eight large socketed denticles.

Etymology.

L. papilla = nipple; adjectival suffix ferus = bearer. In reference to the denticles on the declivity. An adjective.

Distribution.

China (Guizhou), Vietnam.

Host plants.

Recorded only from Carya ( Juglandaceae ).

Remarks.

Locality labels on the holotype are in Chinese and were translated by You Li. An English locality label has been placed on the specimen below the original locality labels.

Figures

Figure 15. Dorsal, lateral and declivital view of Ambrosiophilus papilliferus holotype, 2.5 mm (A, B, I), A. satoi paratype, 2.5 - 2.75 mm (C, D, J), A. sexdentatus, 2.7 - 3.0 mm (E, F, K), and A. subnepotulus, 2.5 - 2.8 mm (G, H, L).