Research Article |
Corresponding author: Zhong Peng ( pz0617@163.com ) Academic editor: Volker Assing
© 2015 Zhong Peng, Zhou Sun, Li-Zhen Li, Mei-Jun Zhao.
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:
Peng Z, Sun Z, Li L-Z, Zhao M-J (2015) Four new species and additional records of Domene and Lathrobium from the Dayao Mountains, southern China. ZooKeys 508: 113-126. https://doi.org/10.3897/zookeys.508.9682
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Material of the paederine genera Domene Fauvel, 1873 and Lathrobium Gravenhorst, 1802 from the Dayao Mountains, southern China, is examined. Eight species are identified, three of them described previously and five undescribed. Four species are described and illustrated for the first time: Domene hei Peng & Li, sp. n., Lathrobium jinxiuense Peng & Li, sp. n., L. kuan Peng & Li, sp. n. and L. leii Peng & Li, sp. n. One probably undescribed species of Lathrobium remains unnamed.
Coleoptera , Staphylinidae , Paederinae , Domene , Lathrobium , new species, additional records, Dayao Mountains, China
Sixteen species of Lathrobiina have been reported from Guangxi (
Covering an area of 249.07 km2, the Dayao Mountains are situated in central Guangxi, southern China. The highest peak is the Shengtang Shan at 1,979 m. According to
In 2011 and 2014, Jia-Yao Hu, Zi-Wei Yin, Xiao-Bin Song, Yi-Ming Yu, Zhu-Qi Yan and the first author made two collecting trips to Dayao Mountains, where they collected numerous Domene and Lathrobium specimens. Eight species were identified, four of which are described for the first time.
The following abbreviations are used in the text, with all measurements in millimeters:
Body length (BL) from the anterior margin of the mandibles (in resting position) to the abdominal apex; length of forebody (FL) from the anterior margin of the mandibles to the posterior margin of the elytra; head length (HL) from the anterior margin of the frons to the posterior margin of the head; head width (HW): maximum width of head; length of antenna (AnL); length of pronotum (PL) along midline; maximum width of pronotum (PW); elytral length (EL) at the suture from the apex of the scutellum to the posterior margin of the elytra (at the sutural angles); length of aedeagus (AL) from the apex of the ventral process to the base of the aedeagal capsule.
The type material is deposited in the Insect Collection of Shanghai Normal University, Shanghai, China (SNUC).
Holotype: ♂, labelled ‘China: Guangxi Prov., Jinxiu Hsien, Shengtang Shan, 23°57'37"N, 110°06'46"E, 1300 m, 21.VII.2014, Peng, Song, Yan & Yu leg.’ (SNUC). Paratypes: 2 ♀♀, same data, but ‘23°59'N, 110°06'E, 1200–1400 m, 25.VII.2011, Peng, Hu & Yin leg.’ (SNUC).
Measurements (in mm) and ratios: BL 10.23–10.66, FL 5.67–5.84, HL 1.54–1.57, HW 1.44–1.51, AnL 3.56–3.67, PL 1.67–1.74, PW 1.39–1.44, EL 1.41–1.48, AL 1.07, HL/HW 1.04–1.07, HW/PW 1.04–1.06, HL/PL 0.90–0.92, PL/PW 1.20–1.22, EL/PL 0.84–0.86.
Habitus as in Fig.
Head (Fig.
Pronotum (Fig.
Each elytron with more or less irregular longitudinal narrowly elevated ridges; suture elevated in posterior two thirds; macropunctation coarse and partly somewhat seriate; interstices with irregular micropunctation. Hind wings reduced. Protarsomeres I–IV distinctly dilated.
Abdomen with fine and dense punctation on tergites III–VIII; posterior margin of tergite VIII weakly convex (Fig.
Male. Sternites III–VI unmodified; sternite VII (Fig.
Female. Posterior margin of sternite VIII (Fig.
Based on more or less irregular longitudinal elevations of elytra, the derived morphology of the aedeagus and particularly on the shapes and chaetotaxy of the male sternites VIII, D. hei belongs to the D. scabripennis species group. It is distinguished from other species of this group by the coloration of legs, the fine glossy line on the pronotum, the shape of the ventral process of the aedeagus and the slender sclerotized structure in the female genital segments. For illustrations of the species of the D. scabripennis species group see
The species is dedicated to Wei-Jun He, specialist of Phasmatodea, who supported us on our field trips.
The type locality is situated in the Shengtang Shan to the southwest of Jinxiu, central Guangxi. The specimens were sifted from leaf litter in a rhododendron forest at altitudes of 1,200–1,400 m, together with Lathrobium shengtangshanense Peng & Li, 2012.
China: Guangxi: 1 ♂, Jinxiu Hsien, Shengtang Shan, 23°57'37"N, 110°06'46"E, 1300 m, 20.VII.2014, Peng, Song, Yan & Yu leg. (SNUC); 2 ♀♀, Jinxiu Hsien, Shengtang Shan, 23°59'N, 110°06'E, 1200–1400 m, 25.VII.2011, Peng, Hu & Yin leg. (SNUC).
Domene chenae was previously known only from Anjiangping in Guangxi. The above material indicates that this species is subject to considerable intraspecific variation. According to the description and illustrations provided by
Holotype: ♂, labelled ‘China: Guangxi Prov., Jinxiu Hsien, Qigongli, 24°09'07"N, 110°12'29"E, 1300 m, 16.VII.2014, Peng, Song, Yan & Yu leg.’ (SNUC). Paratypes: 1 ♀, same label data as holotype (SNUC).
Measurements (in mm) and ratios: BL 6.85–6.91, FL 2.96–3.06, HL 0.78–0.85, HW 0.80–0.84, AnL 1.58–1.63, PL 1.05–1.09, PW 0.84–0.87, EL 0.59–0.63, AL 0.85, HL/HW 0.98–1.01, HW/PW 0.95–0.97, HL/PL 0.74–0.78, PL/PW 1.25, EL/PL 0.56–0.58.
Habitus as in Fig.
Head approximately as long as broad; punctation moderately coarse and sparse, sparser in median dorsal portion; interstices with distinct microreticulation; eyes very small and composed of approximately 20 ommatidia.
Pronotum nearly parallel-sided; punctation similar to that of head; impunctate midline broad; interstices without microsculpture.
Elytral punctation moderately dense, shallow and ill-defined. Hind wings completely reduced. Protarsi with weakly pronounced sexual dimorphism.
Abdomen with fine and moderately dense punctation, that of tergite VII somewhat sparser than that of anterior tergites; interstices with shallow microsculpture; posterior margin of tergite VII without palisade fringe; tergite VIII without sexual dimorphism, posterior margin (Fig.
Male. Sternites III-VI unmodified; sternite VII (Fig.
Female. Posterior margin of sternite VIII (Fig.
The new species resembles L. maoershanense Peng & Li, 2012 in habitus and the similarly derived morphology of the aedeagus, but differs from this species by the smaller posterior excision of the male sternite VIII, the more slender ventral process of the aedeagus and the shape of the female tergite VIII. For illustrations of L. maoershanense see
The specific epithet is derived from Jinxiu, where the type locality is situated.
The type locality is situated in Qigongli to the north of Jinxiu, central Guangxi. The specimens were sifted from leaf litter and humus in a beech forest at an altitude of 1,300 m, together with L. dayaoshanense Peng & Li, 2012.
Holotype: ♂, labelled ‘China: Guangxi Prov., Jinxiu Hsien, Shengtang Shan, 23°59'32"N, 110°06'26"E, 1160 m, 23.VII.2014, Peng, Song, Yan & Yu leg.’ (SNUC). Paratypes: 1 ♂, 1 ♀, same label data as holotype (SNUC).
Measurements (in mm) and ratios: BL 9.17–9.40, FL 4.00–4.11, HL 1.05–1.11, HW 1.05–1.15, AnL 2.00–2.15, PL 1.48–1.51, PW 1.18–1.26, EL 0.78–0.83, AL 1.90–1.93, HL/HW 0.97–1.00, HW/PW 0.89–0.91, HL/PL 0.71–0.74, PL/PW 1.20–1.25, EL/PL 0.53–0.55.
Habitus as in Fig.
Head approximately as long as broad; punctation coarse and moderately dense, somewhat sparser in median dorsal portion; interstices with shallow microreticulation; eyes small and composed of approximately 30 ommatidia.
Pronotum nearly parallel-sided; punctation similar to that of head; impunctate midline moderately broad; interstices glossy and without microsculpture.
Elytral punctation dense and well-defined. Hind wings completely reduced. Protarsi without sexual dimorphism.
Abdomen with fine and dense punctation, that of tergite VII sparser than that of anterior tergites; interstices with distinct microsculpture; posterior margin of tergite VII without palisade fringe; tergite VIII without sexual dimorphism, posterior margin (Fig.
Male. Sternites III-VI unmodified; sternite VII (Fig.
Female. Posterior margin of sternite VIII (Fig.
Based on the modifications of the male sternite VIII, the furcate ventral process of the aedeagus, the presence of long sclerotized spines in the internal sac of the aedeagus, and the divided female tergite IX, Lathrobium kuan belongs to the L. fissispinosum group, which was previously known from Shaanxi, Gansu, Hubei, Guizhou and Sichuan. The new species is distinguished from the other representatives of this group by the chaetotaxy and shapes of the male sternites VII and VIII, the strongly asymmetrical ventral process and the presence of two (rather than one) sclerotized spines in the internal sac of the aedeagus. For illustrations of the species of the L. fissispinosum group see
The specific name is the Chinese adjective “kuan” (broad). It refers to the broad ventral process of the aedeagus of this species, when compared with the other species known from Dayao Mountains.
The type locality is situated in the Shengtang Shan to the southwest of Jinxiu, central Guangxi. The specimens were sifted from leaf litter in a beech forest at an altitude of 1,160 m.
Holotype: ♂, labelled ‘China: Guangxi Prov., Jinxiu Hsien, Shengtang Shan, 23°57'37"N, 110°06'46"E, 1300 m, 21.VII.2014, Peng, Song, Yan & Yu leg.’ (SNUC). Paratypes: 1 ♀, same label data as holotype (SNUC).
Measurements (in mm) and ratios: BL 6.61–6.67, FL 3.11–3.34, HL 0.83–0.87, HW 0.82–0.88, AnL 1.66–1.68, PL 1.12–1.14, PW 0.85–0.90, EL 0.65–0.68, AL 1.26, HL/HW 0.99–1.01, HW/PW 0.96–0.98, HL/PL 0.74–0.76, PL/PW 1.27–1.32, EL/PL 0.58–0.60.
Habitus as in Fig.
Head approximately as long as broad; punctation coarse and moderately sparse, distinctly sparser in median dorsal portion; interstices with shallow microreticulation; eyes small and composed of approximately 35 ommatidia.
Pronotum with weakly convex lateral margins in dorsal view; punctation similar to that of head; impunctate midline broad; interstices without microsculpture.
Elytral punctation moderately dense and defined. Hind wings completely reduced. Protarsi without pronounced sexual dimorphism.
Abdomen with fine and moderately dense punctation, that of tergite VII somewhat sparser than that of anterior tergites; interstices with shallow microsculpture; posterior margin of tergite VII without palisade fringe; tergite VIII without sexual dimorphism, posterior margin (Fig.
Male. Sternites III-VI unmodified; sternite VII (Fig.
Female. Posterior margin of sternite VIII (Fig.
Based on the different general morphology of the aedeagus, L. leii represents a different lineage than the other species recorded from Dayao Mountains. It is additionally distinguished from them by smaller body size, yellowish brown legs, the chaetotaxy of the male sternite VIII, and a slender aedeagus with a long sclerotized spine.
The species is dedicated to Yu-Yang Lei, who supported us on our field trips.
The type locality is situated in the Shengtang Shan to the southwest of Jinxiu, central Guangxi. The specimens were sifted from leaf litter and humus in a rhododendron forest at an altitude of 1,300 m, together with L. shengtangshanense.
China: Guangxi: 2 ♂♂, 3 ♀♀, Jinxiu Hsien, Houzi Shan, Yinshan Station, 24°10'01"N, 110°14'38"E, 1200 m, 10.VII.2014, Peng, Song, Yan & Yu leg. (SNUC); 1 ♀, Jinxiu Hsien, Changtanghe, 24°16'00"N, 110°13'29"E, 860 m, 15.VII.2014, Peng, Song, Yan & Yu leg. (SNUC); 1 ♀, Jinxiu Hsien, Qigongli, 24°09'07"N, 110°12'29"E, 1300 m, 16.VII.2014, Peng, Song, Yan & Yu leg. (SNUC); 1 ♂, Jinxiu Hsien, Laoshan, 24°07'02"N, 110°11'51"E, 950 m, 26.VII.2014, Peng, Song, Yan & Yu leg. (SNUC).
The above material was collected in several localities in the region to the north, east, and northwest of Jinxiu, central Guangxi. The specimens were sifted from deep leaf litter layers in mixed forests at altitudes of 860–1,300 m.
China: Guangxi: 5 ♂♂, 4 ♀♀, Jinxiu Hsien, Shengtang Shan, 23°57'37"N, 110°06'46"E, 1300 m, 21.VII.2014, Peng, Song, Yan & Yu leg. (SNUC).
Lathrobium shengtangshanense has been recorded only from the Shengtang Shan in Guangxi.
China: Guangxi: 1 ♀, Jinxiu Hsien, Shiliugongli, 24°08'25"N, 110°15'38"E, 960 m, 13.VII.2014, Peng, Song, Yan & Yu leg. (SNUC).
The above micropterous female represents an undescribed species distinguished from the other species known from Dayao Mountains by somewhat smaller body size, the slender pronotum and the female secondary sexual characters.
We are indebted to all the collectors mentioned above for their field work. We are most grateful to Volker Assing (Hannover, Germany) for his comments on, and linguistic revision of, an earlier version of the manuscript and to Wei-Jun He (Hongkong, China), Kun Qin (Guangxi, China), Yuyang Lei (Guangxi, China) and Rongjiao Zhang (Guangxi, China) for their extensive support during our collecting trips. We also thank two anonymous reviewers for their comments on a previous version of the manuscript. The study is supported by the National Natural Science Foundation of China (No. 31201734 and 31101659), the Foundation of Shanghai Municipal Education Commission (No. 12YZ077 and No. 13YZ062) and Shanghai Normal University (SK201234, DZL125 and B–9013–11–003127).