Research Article |
Corresponding author: Hongzhang Zhou ( zhouhz@ioz.ac.cn ) Academic editor: Adam Brunke
© 2020 Yanpeng Cai, Xiaoyan Li, Hongzhang Zhou.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Cai Y, Li X, Zhou H (2020) A new species of Queskallion Smetana, 2015 (Coleoptera, Staphylinidae, Quediina) from China. ZooKeys 945: 153-161. https://doi.org/10.3897/zookeys.945.53480
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A new species, Queskallion saetosum sp. nov., is described herein from Sichuan Province, China. It is diagnosed from a closely related species, Q. tangi Smetana, 2015. Color images and line drawings of the adult of the new species, as well as its genitalia are provided. In addition, a checklist of species, an updated key to species and a geographical distribution map of all known species in the genus Queskallion Smetana are included.
Checklist, key, morphology, rove beetle, taxonomy
The genus Queskallion was established by
The genus Queskallion is mainly characterized by the second and third segments of the antenna. In addition to the usual long setae, they have numerous short setae and the surface between the setae is slightly granulose, not quite shiny, therefore visually not obviously contrasting with the dull granulose surface of the following segments bearing dense appressed pubescence; the pronotum with three to five additional setiferous punctures on the posterior lateral area well behind the large lateral puncture; and the surface of the elytra with characteristic semigranulose microsculpture giving it a greasy appearance (
Examination of rove beetle specimens collected from Sichuan Province uncovered the new species. This study aims to describe the new species, distinguish it from congeners and provide up-to-date information on the distribution of the genus (Fig.
Specimens were relaxed in warm water (60 °C) for 5–8 hours for dissection of the abdominal segments VIII–X and the genitalia. After examination, the dissected body parts were glued back to the mounting cards for future study. Observation, dissection and measurements were performed using a stereo microscope (Zeiss SteREO Discovery V20). Images of the adult and genitalia were captured with an AxioCam MRc 5 camera attached to a Zeiss Axio Zoom V16 Fluorescence Stereo Zoom Microscope, and photomontage was performed in Zen 2012 (blue edition) imaging software (https://www.zeiss.com.cn/microscopy/products/microscope-software/zen.html). Inkscape V0.91 was used to make the line drawings. The abdominal tergites and sternites were entirely flattened for the line drawings to make the illustrations more distinguishable among species. Species distribution data were compiled within Microsoft Excel using both published records and specimen label data. The distribution map was produced with the aid of DIVA-GIS 7.5 (
The specimens examined, including types, were deposited in the Institute of Zoology, Chinese Academy of Sciences (
Morphological terminology followed
The following abbreviations are used in the text:
BL body length (from apex of clypeus to apex of abdominal tergite VIII);
BW body width (maximal body width, usually equal to EW);
HL head length (from base of clypeus to neck constriction);
HW head width (maximal head width, including eyes);
PL pronotal length (along midline of pronotum);
PW pronotal width (maximal pronotal width);
EL elytral length (maximal elytral length);
EW elytral width (maximal elytral width);
ESL elytral suture length (from apex of scutellum to apex of elytral suture);
AW abdominal width (maximal width of abdomen);
HEL (head) eye length;
HTL (head) temporal length.
Queskallion tangi Smetana, 2015, by original designation.
Queskallion dispersepunctatum (Scheerpeltz, 1965: 209)
Distribution: China (Yunnan Province), Myanmar, Nepal.
Queskallion montanum Smetana, 2015: 410
Distribution: China (Gansu and Sichuan Provinces).
Queskallion saetosum sp. nov.
Distribution: China (Sichuan Province).
Queskallion schuelkei Smetana, 2015: 408
Distribution: China (Yunnan Province).
Queskallion seronatum Smetana, 2015: 411
Distribution: Nepal.
Queskallion tangi Smetana, 2015: 407
Distribution: China (Xizang Autonomous Region).
(updated from
1 | Last puncture of dorsal rows on pronotum shifted considerably posteriad toward posterior third of pronotal length, each dorsal row with four punctures. Paramere of aedeagus quite narrow and elongate; sensory peg setae on underside not numerous, most situated near apex of paramere | Q. dispersepunctatum (Scheerpeltz) |
– | Last puncture of dorsal rows on pronotum not shifted posteriad, situated before or at middle of pronotal length, each dorsal row with three punctures. Paramere of aedeagus of different shape, in general much wider, sensory peg setae on underside numerous and located differently | 2 |
2 | Sensory peg setae on underside of paramere arranged into groups, forming certain characteristic figures | 3 |
– | Sensory peg setae on underside of paramere widely spread over most of the fusiform part of paramere, not forming any kind of discernible figure | 4 |
3 | Paramere of aedeagus slightly narrower than median lobe (Fig. |
Q. saetosum sp. nov. |
– | Paramere of aedeagus with subapical portion slightly dilated laterally, becoming wider than median lobe, underside with sensory peg setae arranged into two S-like figures. Female tergite X with apical margin deeply and arcuately emarginated | Q. tangi Smetana |
4 | Apical portion of median lobe of aedeagus parallel-sided with apex slightly emarginated, aedeagus in general relatively short | Q. schuelkei Smetana |
– | Apical portion of median lobe of aedeagus at least slightly narrowed toward arcuate apex, aedeagus in general longer | 5 |
5 | Aedeagus in general quite narrow, elongate, apical portion of paramere moderately dilated, elongate-oval in shape | Q. seronatum Smetana |
– | Aedeagus in general broader, less elongate, apical portion of paramere markedly dilated, broadly-oval in shape | Q. montanum Smetana |
Holotype
: China • ♂; Sichuan Province, Baoxing County, Longdong, Ruobigou; alt. 1600 m; 10 August 2003; Xiaodong Yu (
This new species is very similar to Q. tangi Smetana in all characters, but it can be distinguished from the latter by having the male paramere of the aedeagus slightly narrower than the median lobe, underside with sensory peg setae arranged into one characteristic inversed Y-shaped figure, female tergite X with apical margin forming distinctive M-shaped indention; whereas the latter has male paramere of aedeagus with subapical portion slightly dilated laterally becoming wider than median lobe, underside with sensory peg setae arranged into two S-like figures, female tergite X with apical margin deeply and arcuately emarginated.
Head dark brown to blackish brown; pronotum, scutellum and elytra dark brown; abdomen dark brown, each tergite with posterior margin slightly paler; head, pronotum and abdomen strongly iridescent; antennae dark brown, labrum yellowish-brown, mandibles dark brown, maxillary and labial palpi dark brown; legs dark brown.
BL = 8.5 mm, BW = 1.7 mm, HL/PL/EL = 1.00: 1.52: 1.80, HW/PW/EW/AW = 1.00: 1.60: 1.84: 1.55.
Head (Fig.
Pronotum (Fig.
Scutellum (Fig.
Elytra (Fig.
Abdominal tergite II finely punctate; setiferous punctures of other tergites finer and sparser than those of elytra, distinctly becoming sparser toward posterior margin of each tergite, and generally becoming so toward apex of abdomen; tergite VII with whitish apical seam of palisade setae.
Male with first four segments of foretarsus moderately dilated, sub-bilobed, each heavily covered with tenent setae ventrally, segment II slightly narrower than apex of tibia. Tergite VIII with basal ridge complete, slightly arched backward in middle, surface without long seta; sternite VIII (Fig.
Female first four segments of fore tarsus similar to those of male, but less dilated; sternite VIII with basal ridge inconspicuous, with 2 long setae on each side; tergite X (Fig.
Queskallion saetosum sp. nov. is at present known only from the type locality in central Sichuan Province (Fig.
The specific name is from the Latin adjective saetosus, -a, -um (bristly), referring to the additional setae on the pronotum.
We want to thank the editors and the reviewers for reviewing this manuscript and giving a lot of constructive suggestions, and also, we are very grateful to Dr Xiaodong Yu (