A review of the non-lyctine powder-post beetles of Yunnan (China) with a new genus and new species (Coleoptera: Bostrichidae)
Author
Zhang, Yi-Feng
0000-0003-3264-9472
Honghe University, College of Biological & Agricultural Sciences, Mengzi, Yunnan 661199, China. & zhang _ yifeng @ foxmail. com; https: // orcid. org / 0000 - 0003 - 3264 - 9472
zhang_yifeng@foxmail.com
Author
Meng, Ling-Zeng
Honghe University, College of Biological & Agricultural Sciences, Mengzi, Yunnan 661199, China.
Author
Beaver, Roger A.
161 / 2 Mu 5, Soi Wat Phranon, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand.
text
Zootaxa
2022
2022-01-17
5091
4
501
545
journal article
2548
10.11646/zootaxa.5091.4.1
63aff060-8318-4eb1-9d79-f15004b9583a
1175-5326
5863820
FA12D38D-EBF9-4EA1-A413-A203A9FF4EFB
Gracilenta
gen.nov.
Type
species:
Gracilenta yingjiangensis
sp. nov.
, here designated.
Diagnosis.
A member of the tribe
Xyloperthini
, characterized by the lamelliform intercoxal process of the first abdominal ventrite, the mandibles crossed at the tips, and the well-developed elongate antennal club (
Lesne 1921
;
Fisher 1950
). It is distinguished from other genera of
Xyloperthini
by the following combination of characters. Frons slightly convex, with a tuft of long, erect, upwardly directed hairlike setae on each side next to inner margin of eyes. Mandibles symmetrical, pointed at tip, with a small tuft of long, erect hairs at basal margin. Antenna with ten antennomeres, the first antennomere of the antennal club rectangular, the second and third distinctly narrower and elongate, gracile, last antennomere 3–4 × as long as wide, the whole club matt, without clear sensory impression areas or erect hairs. Pronotum without a lateral carina, posterior angle of prothorax broadly rounded. Posterior part of elytral disc with three pairs of costae, the first and second not distinct, the third ending in a small process at the upper margin of the elytral declivity. Protibiae normal, widest apically, with a row of sparse, small teeth on posterior face. Last abdominal ventrite segment of male with pleural pieces.
Description.
Male. Body cylindrical, elongate.
Head.
Deeply inserted in prothorax, not visible from above. Frontoclypeal suture distinct, with median fovea. Frons with a tuft of long, erect, upwardly directed hairlike setae next to inner margin of eyes. Labrum transverse with a fringe of hairs along anterior margin. Epistoma slightly emarginate anteriorly. Mandibles symmetrical, bluntly pointed, with a small tuft of long, erect, and upwardly directed setae at basal margin. Eyes large, weakly oval, globose, strongly projecting. Antenna with 10 antennomeres, first antennomere elongate, antennomeres 3–7 together equal in length to the first, all antennomeres of the antennal club very elongate, the second and third distinctly narrower than the first, the last antennomere about 3.5 × as long as wide, club matt, without depressions or distinct sensory areas or dense erect setae, a few sparse setae on the antennomere lateral margins.
Pronotum.
Wider than long, widest in posterior third, a distinct upwardly-directed uncinate tooth on each anterolateral angle, a series of upwardly-directed teeth behind this
form lateral
border of rasp on anterior half of pronotum, teeth gradually smaller and less erect towards summit of pronotum, pronotal disc slightly coarsely punctured, matt, postero-lateral angles broadly rounded, vestiture of short to moderately long hair-like setae.
Elytra.
Parallel-sided, slightly widened posteriorly, about twice as long as pronotum, discal punctures gradually increasing in size posteriorly, strongest on upper part of declivity; declivity angularly separated from disc, steep, lateral margin with a pair of tubercles located at the mid-height of the declivity, elytral margin sharp, separated by a marginal groove from lateral parts of elytra, thickened and forming a broad false epipleuron apically.
Abdomen.
Male with pleural pieces, without modifications of the abdominal ventrites. Female unknown.
Relationships.
The lamelliform intercoxal process of the first abdominal ventrite, the mandibles crossed at the tips and the well-developed elongate antennal club show that
Gracilenta
gen.nov.
clearly belongs in the tribe
Xyloperthini
(
Lesne 1901
;
Fisher 1950
).
Gracilenta
appears most similar to
Xylodrypta
and
Xylodectes
among the Xyloperthine genera distributed in the
Oriental region
. However, it is distinguished from both genera by the large size (
10 mm
long), very elongate antenna with the last antennomere about 3.5 × as long as wide, and the presence of tufts of hairs on the frons only next to the eyes. It is further distinguished from
Xylodrypta
by the presence of a false epipleuron near the apex of the elytra, and pleural pieces present in the male.
Distribution.
Known only from S-W
China
(
Yunnan
).
Etymology.
The genus name is feminine, and refers to the gracile, elongated antenna club. Latin
gracilis
means slender.