Xyleborinus huifenyinae, 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

Xyleborinus huifenyinae sp. nov. Fig. 84A, B, I

Type material.

Holotype, female, China: Jiangxi, Xunwu, Xiangshan, You Li, 10.x.2018, ex Fagaceae log (IZAS).

Diagnosis.

1.7 mm long (n = 1); 2.83 × as long as wide. This species is distinguished by declivital interstriae 2 unarmed on face (armed at summit); granules at declivital summit extending to apical quarter of disc; declivital posterolateral margin costate and denticulate; declivital face shagreened, dull; declivital interstriae flat, interstriae 2 not impressed; and denticles on interstriae 1 and 3 prominent.

This species is very similar to X. perpusillus and is distinguished by the shagreened declivity, posterolateral declivity margin costate and denticulate, and larger denticles on interstriae 1 and 3.

Similar species.

Xyleborinus exiguus , X. perpusillus , X. tritus .

Description

(female). 1.7 mm long (n = 1); 2.83 × as long as wide. Body dark brown, pronotum lighter than elytra. Legs and antennae light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes, alutaceous, subshiny, finely and sparsely punctate, setose; punctures bearing a long, erect hair-like seta. Eyes shallowly emarginate just above antennal insertion, upper part smaller than lower part. Submentum large, distinctly triangular, slightly impressed. Antennal scape short and thick, as long as club. Pedicel as wide as scape, as long as funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club approximately circular, obliquely truncate, type 1; segment 1 corneous, encircling anterior face; segment 2 narrow, concave, corneous on anterior face only; sutures absent on posterior face. Pronotum: 1.06 × as long as wide. In dorsal view long and rounded frontally, type 7, sides parallel in basal 2/3, rounded anteriorly; anterior margin without serrations. In lateral view type 7, elongate, disc much longer than anterior slope, summit low, on anterior 1/3. Anterior slope with densely spaced narrow asperities, becoming lower and more strongly transverse towards summit, bearing long, fine, semi-recumbent, hair-like setae. Disc subshiny, alutaceous, finely punctate, finely setose, setae short, erect, hair-like, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles acutely rounded. Elytra: 1.69 × as long as wide, 1.58 × as long as pronotum. Scutellum minute, conical, disconnected from elytra, surrounded by dense mycangial tuft of setae. Elytral base transverse, medially emarginate near scutellum and mycangial tuft, edge oblique, humeral angles angulate, parallel-sided in basal 3/4, then weakly rounded to apex. Disc occupying basal 2/3, smooth, shiny, interstriae 1-3 granulate on apical quarter; striae not impressed, with small punctures separated by two diameters of a puncture setose, setae recumbent, as long as the distance between punctures; interstriae flat, sparsely finely uniseriate punctate, punctures 1/3 those of striae, each bearing erect hair-like setae, setae approximately as long as width of interstriae 2. Declivital face strongly shagreened, dull, steeply rounded, feebly sulcate between interstriae 3; three parallel striae present; interstriae impunctate, flat; interstriae 1 and 3 armed by four prominent denticles along its length; interstriae 2 unarmed along its length, one small denticle at summit; interstrial denticles and spines setose, setae erect, hair-like, uniseriate and as long as the width between suture and interstriae 3. Posterolateral margin costate, tuberculate to interstriae 7. Legs: procoxae contiguous; prosternal coxal piece tall, conical. Protibiae obliquely triangular, broadest at apical 1/3; posterior face smooth; apical 1/3 of outer margin with six moderate socketed denticles, their length approximately as long as basal width. Meso- and metatibiae flattened; outer margin evenly rounded with eight and seven moderate socketed denticles, respectively.

Etymology.

Named for Dr. Hui-Fen Yin and her contribution to the understanding of the Chinese scolytine fauna. Noun in genitive.

Distribution.

China (Fujian).

Host plants.

This species is only known from Fagaceae .

Figures

Figure 84. Dorsal, lateral and declivital view of Xyleborinus huifenyinae holotype, 1.7 mm (A, B, I), X. jianghuasuni holotype, 1.8 mm (C, D, J), X. octiesdentatus, 2.5 - 2.65 mm (E, F, K), and X. perpusillus, 1.6 - 1.9 mm (G, H, L).