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Research Article
The genus Hercostomus Loew (Diptera, Dolichopodidae, Dolichopodinae) from Inner Mongolia, China, with the description of two new species
expand article infoXingyang Qian‡, Ning Wang‡, Ding Yang§
‡ Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot, China
§ China Agriculture University, Beijing, China

Corresponding author: Ning Wang ( wangningis@163.com )

Corresponding author: Ding Yang ( dyangcau@126.com )

Academic editor: Marija Ivković
© 2022 Xingyang Qian, Ning Wang, Ding Yang.
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: Qian X, Wang N, Yang D (2022) The genus Hercostomus Loew (Diptera, Dolichopodidae, Dolichopodinae) from Inner Mongolia, China, with the description of two new species. ZooKeys 1118: 119-131. https://doi.org/10.3897/zookeys.1118.84403
ZooBank: urn:lsid:zoobank.org:pub:862064A3-0C52-401A-AA0C-10D33D626A66
Open Access

Abstract

Previously, only two species of Hercostomus Loew were known to occur in Inner Mongolia. Here two species from Inner Mongolia are described as new to science, namely Hercostomus chifengensis sp. nov. and Hercostomus triangulatus sp. nov. Three new records of Hercostomus in Inner Mongolia are added. A key to the species of Hercostomus in Inner Mongolia is provided.

Keywords

Identification key, long-legged flies, new records, taxonomy

Introduction

Hercostomus Loew is one of the largest genera in the family Dolichopodidae with 475 known species worldwide, of which 300 species have been recorded from China (Yang et al. 2006; Yang et al. 2011; Qilemoge et al. 2017, 2020; Grichanov 2020). Members of Hercostomus can be identified by the following features: eyes separated at the lower margin; thorax lacking a distinct dark spot above the notopleuron, pleural surface in front of the posterior spiracle bare; mid femora with an anterior preapical bristle; hind femora with the anterior bristle positioned at the apex, usually slightly flattened laterally, or not; fore tarsus usually simple; wing rarely darkened in the anterior half; vein M1+2 weakly sinuate, flexion at the basal third or at the middle of the distal part and sometimes with subapical flexion; sometimes the basiventral epandrial lobe of the epandrium and hypandrium forming complex entangled asymmetrical lobes (Brooks 2005; Grichanov 2011; Yang et al. 2011).

Inner Mongolia is located in a narrow region extending northeast to southwest in northern China. The climate of Inner Mongolia is temperate continental with greater precipitation in the northeast compared to the southwest and higher temperatures in the southwest compared to the northeast. Natural vegetation types range from forests, meadow steppe, typical steppe, desert steppe and the Gobi Desert from the northeast to the southwest, respectively.

Previously, only two species, Hercostomus neimengensis Yang, 1997 and H. sinicus Stackelberg, 1934, were recorded from Inner Mongolia (Yang et al. 2011). Here two new species of Hercostomus are described from Inner Mongolia, namely H. chifengensis sp. nov. and H. triangulatus sp. nov. The following three species are newly recorded from Inner Mongolia: Hercostomus beijingensis Yang, 1996, Hercostomus dilatitarsis Stackelberg, 1949 and Hercostomus shennongjiensis Yang, 1997. A key to species of Hercostomus in Inner Mongolia is provided. All of the updated records are distributed in mountains of nature reserves in Inner Mongolia: Jiufeng Mountain, Helan Mountain, Daqinggou. Hercostomus neimengensis Yang, 1997 is also distributed in grasslands of Keerqin. We discovered that all Hercostomus species in Inner Mongolia are distributed in grasslands near creeks and damp areas of mountains (Fig. 1). Currently, the genus comprises 300 species in China and is distributed widely around China. The low level of diversity of the genus in Inner Mongolia is probably the result of few investigations (Yang et al. 2011). Thus, it is promising to find more Hercostomus species in Inner Mongolia, especially in forests of northeast part of Inner Mongolia.

Figure 1. 

Distribution of Hercostomus in Inner Mongolia.

Materials and methods

The specimens on which this study is based were collected from Inner Mongolia in 2013 and 2014 by sweeping net. All specimens are deposited in the Entomological Museum of China Agricultural University (CAU), Beijing. Morphological terminology follows Cumming and Wood (2017). The following abbreviations are used: acr = acrostichal bristle (s), ad = anterodorsal bristle (s), av = anteroventral bristle (s), dc = dorsocentral bristle (s), sc = scutellars, pd = posterodorsal bristle (s), v = ventral bristle (s), LI = fore leg, LII = mid leg, LIII = hind leg, CuAx ratio = length of dm–cu / length of distal portion of CuA.

Taxonomy

Key to species (males) of Hercostomus from Inner Mongolia

1 Antenna entirely black 2
– Antenna yellow or partly dark yellow 4
2 Abdominal tergites (Figs 3, 7) wholly metallic green; male cercus (Figs 10, 11) with distinct denticles 3
– Abdominal tergites 1–3 (Fig. 2) yellow at lateral margin; male cercus with indistinct or weak denticles H. beijingensis Yang
3 Postpedicel (Fig. 9) 1.8 times longer than wide, blunt at tip; male cercus (Fig. 10) lobate, slightly shorter than epandrium, distinctly longer than wide, with several short finger-like marginal processes H. chifengensis sp. nov.
– Postpedicel 1.3 times longer than wide, sharp at tip; male cercus (Fig. 11) long strip-like, geniculate, apical half with long marginal bristles hook-like apically H. sinicus Stackelberg
4 Epandrial lobe very long finger-like; male cercus very narrow, long strip-like with indistinct or weak digitations H. shennongjiensis Yang
– Epandrial lobe (Fig. 14) very short or absent; male cercus (Fig. 14) rather wide, somewhat quadrate or triangular with distinct digitations 5
5 Fore tarsomeres 2–5 flattened; epandrium slightly longer than wide, with nearly truncate apical margin H. dilatitarsis Stackelberg
– Fore tarsus simple; epandrium (Fig. 14) distinctly longer than wide, with convex apical margin 6
6 Postpedicel blackish at base, obtuse at tip; male cercus band-like with some marginal denticles at tip H. neimengensis Yang
– Postpedicel (Fig. 12) blackish with basal ventral surface dark yellow, acute at tip; male cercus (Fig. 14) nearly triangular with weak denticles and 3 relatively long finger-like processes H. triangulatus sp. nov.

Hercostomus beijingensis Yang, 1996

Fig. 2

Hercostomus beijingensis Yang, 1996: 318. Type locality: China: Beijing, Yingtaogou.

Diagnosis

Antenna entirely black; postpedicel 1.8 times longer than wide, blunt at tip. Metapleuron yellow. Abdominal tergites 1–3 yellow at lateral margin. All coxae entirely yellow. Male cercus nearly quadrate. Phallus thin and long, apically geniculate.

Figures 2–5. 

Habitus, lateral view 2 Hercostomus beijingensis Yang, 1966, male 3 Hercostomus chifengensis sp. nov., holotype male 4 Hercostomus dilatitarsis Stackelberg, 1949, male 5 Hercostomus neimengensis Yang, 1997, female. Scale bars: 1 mm.

Specimens examined

Holotype : male, China, Beijing, Xiangshan, Yingtaogou, 1987.V.30, Ding Yang (CAU). Other material: 2 males, China, Inner Mongolia, Tongliao, Daqinggou, 200–300m, 2014.VII.22, Ning Wang & Ding Yang (CAU).

Distribution

China (Inner Mongolia, Beijing, Henan, Shanxi, Hubei).

Hercostomus chifengensis sp. nov.

https://zoobank.org/BAA059A0-E3CE-4AF2-AEDD-61689F5F5270
Figs 3, 9–10

Diagnosis

Antenna entirely black; postpedicel 1.8 times longer than wide, blunt at tip; basal segment of arista 0.55 times as long as apical segment. Legs entirely black. Wings slightly tinged brown. Male cercus nearly lobate, distinctly longer than wide, with short finger-like marginal processes.

Figures 6–8. 

Habitus, lateral view 6 Hercostomus shennongjiensis Yang, 1997, male 7 Hercostomus sinicus Stackelberg, 1934, male 8 Hercostomus triangulatus sp. nov., holotype male. Scale bars: 1 mm.

Description

Male (Fig. 3). Body length 3.1–3.2 mm, wing length 3.5–4.1 mm.

Head metallic green with pale grey pollinosity. Hairs and bristles on head black, but middle and lower postocular bristles and posteroventral hairs yellow. Ocellar tubercle with 2 strong oc and 2 short posterior hairs. Antenna (Fig. 9) black; postpedicel 1.8 times longer than wide, blunt at tip; arista black, basal segment 0.55 times as long as apical segment. Proboscis brownish with black hairs; palpus black with black hairs and 1 black apical bristle.

Figures 9, 10. 

Hercostomus chifengensis sp. nov., male. 9 antenna, lateral view 10 genitalia, lateral view. Abbreviations: hyp = hypandrium, epan = epandrial lobe, cer = cercus, sub = subepandrial process. Scale bars: 0.1 mm.

Thorax metallic green with pale grey pollinosity. Hairs and bristles on thorax black; 7–8 irregularly biseriate acr short hair-like, 6 long strong dc. Scutellum with 2 pairs of sc and several short marginal hairs, basal pair hair-like.

Legs entirely black. Hairs and bristles on legs black. Mid and hind coxae each with 1 outer bristle; mid and hind femora each with 1 preapical bristle; fore tibia with 3 short ad, 2 short pd and 2 apical bristles; mid tibia with 4 ad, 2 pd, 1 av and 3 apical bristles; hind tibia with 3 ad, 2 pd, 1 short av and 3 apical bristles; hind tarsomere 1 with 1 short v at base. Relative lengths of tibia and 5 tarsomeres of legs LI: 1.8: 0.8: 0.4: 0.3: 0.2: 0.2; LII: 2.7: 1.15: 0.6: 0.5: 0.3: 0.2; LIII: 3.4: 0.85: 1.0: 0.7: 0.45: 0.3. Wing nearly hyaline, slightly tinged brownish; veins brown; R4+5 and M1+2 distinctly convergent apically; CuAx ratio 0.55. Squama yellow with blackish hairs. Halter yellow.

Abdomen metallic green with pale grey pollinosity. Hairs and bristles on abdomen black. Male genitalia (Fig. 10): Epandrium distinctly longer than wide, narrowed at tip; inner epandrial lobe relatively small, outer epandrial lobe long finger-like with somewhat swollen tip. Subepandrial process with two long processes branched, one blunt at tip, one sharp at tip. Male cercus large, lobate, slightly shorter than epandrium, distinctly longer than wide, with several short finger-like marginal processes. Hypandrium tubular at tip, with a hook-like projection near middle.

Female. Unknown

Type material examined

Holotype : male, China, Inner Mongolia, Chifeng, Wangyedian, Binlanggoumen, 1223 m, 2014.VIII.25, Li Shi (CAU). Paratype: 1 male, China, Inner Mongolia, Chifeng, Saihanwula, 1200 m, 2013.VII.24, Xiumei Lu (CAU).

Distribution

China (Inner Mongolia).

Remarks

The new species is somewhat similar to H. subrusticus Zhang, Yang & Grootaert, 2008 from Xinjiang of China, but can be distinguished from the latter by the arista located at middle of the dorsal margin of the postpedicel and the male cercus long and narrow. In H. subrusticus, the arista is located at the apical one-third of the dorsal margin of the postpedicel, and the male cercus is relatively short and wide (Zhang et al. 2008).

Etymology

The species is named after the type locality Chifeng.

Hercostomus dilatitarsis Stackelberg, 1949

Fig. 4

Hercostomus dilatitarsis Stackelberg, 1949: 687. Type locality: Tajikistan: Kondara. Valley Varzob. Gissar Ridge.

Diagnosis

Postpedicel entirely black. Coxae entirely yellow, but mid coxa tinged blackish. Fore tarsomere 1 yellow, tarsomeres 2–3 distinctly flattened and black, tarsomeres 4–5 weakly flattened and white.

Specimens examined

1 male, China, Inner Mongolia, Mount Jiufeng, Toudaogou, 1500–1600 m, 2013.VIII.4, Xiao Zhang (CAU). 3 males 3 females, China, Inner Mongolia, Helan Mountain, Shuimogou, 1800–1900 m, 2010.VIII.6, Lihua Wang (CAU).

Distribution

China (Inner Mongolia, Hebei); Tajikistan.

Hercostomus neimengensis Yang, 1997

Fig. 5

Hercostomus (Hercostomus) neimengensis Yang, 1997: 138. Type locality: China: Inner Mongolia, Tuyouqi.

Diagnosis

Antenna yellow with postpedicel blackish at tip and 1.1 times longer than wide. Thorax metallic green, except hypopleuron partly yellow and metapleuron entirely yellow. Legs including coxae yellow; hairs and bristles on coxae yellowish. Male cercus band-like with some marginal denticles at tip.

Specimens examined

Holotype : male, China, Inner Mongolia, Tumoteyouqi, 1978.VII.21, Heming Chen (CAU). Other material: 1 male 8 females, China, Inner Mongolia, Helan Mountain, Xiangchizigou, 1900 m, 2013.VII.30, Xiao Zhang (CAU).

Distribution

China (Inner Mongolia, Gansu).

Hercostomus shennongjiensis Yang, 1997

Fig. 6

Hercostomus (Hercostomus) shennongjiensis Yang, 1997: 118. Type locality: China: Hubei, Shennongjia.

Diagnosis

Postpedicel dark yellow at basal ventral portion, 1.2 times longer than wide, somewhat acute at tip. All coxae entirely black or blackish. Wing slightly brownish. Male cercus long strip-like with short hairs. Epandrial lobe long finger-like with very long apical bristles.

Specimens examined

1 male 1 female, China, Inner Mongolia, Mount Jiufeng, Erdaogou, 1400–1500 m, 2013.VIII.3, Xiumei Lu (CAU).

Distribution

China (Inner Mongolia, Hubei, Shanxi, Henan).

Hercostomus sinicus Stackelberg, 1934

Figs 7, 11

Hercostomus sinicus Stackelberg, 1934: 174. Type locality: China: “Dyn-uan-in, Nord-Alashan”.

Diagnosis

Postpedicel 1.3 times longer than wide, sharp at tip. Fore tarsomeres 1–3 relatively thin, tarsomeres 4–5 weakly thickened, tarsomere 4 dark brown, tarsomere 5 white. Male cercus long strip-like, geniculate, apical half with long marginal bristles hook-like apically.

Description

Male (Fig. 7). Body length 3.1–3.2 mm, wing length 3.0–3.2 mm.

Head metallic green with pale grey pollinosity. Hairs and bristles on head black, but middle and lower postocular bristles and posteroventral hairs yellow. Antenna black; postpedicel nearly square, 1.3 times longer than wide, sharp at tip; arista black with short hairs, basal segment 0.2 times as long as apical segment. Proboscis brownish yellow with brownish yellow hairs; palpus blackish with brownish yellow hairs and 1 blackish apical bristle.

Thorax metallic green with pale grey pollinosity. Hairs and bristles on thorax black; 6 irregularly biseriate acr slightly long and strong, 6 long strong dc. Scutellum with 2 pairs of sc, basal pair hair-like. Propleuron with yellowish hairs and 1 bristle on lower portion.

Legs mostly yellow. Fore coxa yellow, mid coxa blackish, hind coxa brownish yellow; fore tarsomere 4 dark brown, tarsomere 5 white; mid and hind tarsus brown or dark brown from tip of tarsomere 1 onwards. Fore tarsomeres 1–3 relatively thin, tarsomeres 4–5 weakly thickened. Hairs and bristles on legs black, but some hairs and bristles on coxae yellow; mid and hind coxae each with 1 outer bristle; mid and hind femora each with 1 preapical bristle. Fore tibia with 1 ad, 2 pd and 3 apical bristles (apico-ventral bristle brown, 1/4 as long as tarsomere 1); mid tibia with 2–3 ad, 2 pd and 4 apical bristles; hind tibia with 2 ad, 3 pd and 4 apical bristles (including 1 subapical pd). Relative lengths of tibia and 5 tarsomeres of legs LI: 2.25: 1.1: 0.85: 0.6: 0.35: 0.3; LII: 2.75: 1.45: 0.8: 0.65: 0.4: 0.3; LIII: 3.2: 0.9: 1.2: 0.7: 0.5: 0.3. Wing nearly hyaline, veins dark brown; R4+5 and M1+2 distinctly convergent apically; CuAx ratio 0.4. Squama yellow with brown hairs. Halter yellow.

Abdomen metallic green with pale grey pollinosity except hypogygium brownish yellow at tip. Hairs and bristles on abdomen black. Male genitalia (Fig. 11): Epandrium distinctly longer than wide; epandrial lobe weakly bulged. Male cercus long strip-like, geniculate, apical half with long marginal bristles hook-like apically. Hypandrium irregularly branched, right process short, left process long and hook-like.

Figure 11. 

Hercostomus sinicus Stackelberg, 1934, male genitalia, lateral view. Abbreviations: hyp = hypandrium, epan = epandrial lobe, cer = cercus. Scale bars: 0.1 mm.

Female. Body length 3.2–3.5 mm, wing length 3.0–3.2 mm.

Specimens examined

2 males, China, Inner Mongolia, Tongliao, Daqinggou, 180 m, 2014.VII.22, Ning Wang & Ding Yang (CAU).

Distribution

China (Inner Mongolia).

Remarks

This species is redescribed with illustrations of male genitalia for the first time.

Hercostomus triangulatus sp. nov.

https://zoobank.org/76823345-6706-4FC3-BBAF-D3087E4E34C4
Figs 8, 12–14

Diagnosis

Antenna mainly dark yellow; postpedicel blackish with basal ventral surface dark yellow, 1.2 times longer than wide, obtuse at tip; arista black, basal segment 0.25 times as long as apical segment. All coxae dark yellow. Male cercus nearly triangular with weak denticles and 3 relatively long finger-like processes.

Description

Male (Fig. 8). Body length 3.7–4.1 mm, wing length 3.3–3.6 mm.

Head metallic green with dense pale grey pollinosity. Hairs and bristles on head black, middle and lower postocular bristles and posteroventral hairs yellow. Antenna (Fig. 12) dark yellow except scape blackish at base and postpedicel blackish with base and ventral surface dark yellow; postpedicel 1.2 times longer than wide, somewhat acute at tip; arista blackish with short pubescence, basal segment 0.25 times as long as apical segment. Proboscis brownish yellow with black hairs; palpus brownish, with dark yellow hairs and 1 dark yellow apical bristle.

Figures 12–14. 

Hercostomus triangulatus sp. nov., male 12 antenna, lateral view 13 subepandrial processess and postgonite, lateral view 14 genitalia, lateral view. Abbreviations: hyp = hypandrium, epan = epandrial lobe, cer = cercus. Scale bars: 0.1 mm.

Thorax metallic green with pale grey pollinosity. Hairs and bristles on thorax black; 6~8 irregularly biseriate acr short hair-like; 6 long strong dc. Scutellum with 2 pairs of sc, basal pair short hair-like. Propleuron with yellowish hairs and 1 black bristle on lower portion.

Legs yellow; all coxae yellow; all tarsi brown to dark brown from tip of tarsomere 1 onwards. Hairs and bristles on legs black; mid and hind coxae each with 1 outer bristle; mid and hind femora each with 1 preapical bristle; fore tibia with 1 ad, 2 pd and 2 short apical bristles; mid tibia with 4 ad, 2 short pd, 1 av and 4 short apical bristles; hind tibia with 3 ad, 3 pd, 4 short av (2 inner bristles thin, 2 outer bristles thick) and 3 apical bristles. Hind tarsomere 1 with 1 short ventral bristle at base. Relative lengths of tibia and 5 tarsomeres of legs LI: 2.0: 1.1: 0.5: 0.4: 0.3: 0.2; LII: 2.8: 1.5: 0.8: 0.7: 0.4: 0.3; LIII: 3.4: 1.0: 1.2: 0.5: ?: ?. Wing nearly hyaline, veins dark brown; R4+5 and M distinctly convergent apically; CuAx 0.5. Squama yellow with dark yellowish hairs. Halter yellow.

Abdomen metallic green with pale grey pollinosity. Hairs and bristles on abdomen black; tergite 1 with several short yellow hairs; sternites 2–3 with short yellow hairs. Male genitalia (Fig. 14): Epandrium distinctly longer than wide, narrowed at tip; epandrial lateral lobe relatively short and thick. Subepandrial process (Fig. 13) with two processes separated, narrowed at tip. Male cercus nearly triangular with some weak denticles and 3 relatively long finger-like processes bearing long bristles on apical margin. Hypandrium somewhat acute at tip.

Female. Body length 3.0–3.6 mm, wing length 3.6–3.7 mm.

Type material examined

Holotype : male, China, Inner Mongolia, Tongliao, Daqinggou, 180m, 2014.VII.24, Ning Wang & Ding Yang (CAU). Paratypes: 3 males 1 female, same data as holotype (CAU); 8 males 3 females, China, Inner Mongolia, Tongliao, Daqinggou, 180 m, 2014.VII.23, Ning Wang & Ding Yang (CAU); 1 male 1 female, China, Tongliao, Daqinggou, 180 m, 2014.VII.22, Ning Wang & Ding Yang (CAU).

Distribution

China (Inner Mongolia).

Remarks

The new species is somewhat similar to the members of H. crassivena group, but the veins of H. triangulatus are not thickened (Zhang and Yang 2007).

Etymology

This species is named after the triangular cercus.

Discussion

Hercostomus Loew is probably polyphyletic and not a monophyletic genus as it is poorly defined (Brooks 2005; Yang et al. 2011). Currently 300 species of Hercostomus are distributed in China, of which seven species are distributed in Inner Mongolia. Twenty-four species groups of Hercostomus distributed in China were recognized (Yang et al. 2011; Grichanov 2020), namely H. crassivena group, H. abnormis group, H. longicercus group, H. quadriseta group, H. takagii group, H. fatuus group, H. ulrichi group, H. flavimaculatus group, H. subnovus group, H. flaviventris group, H. curvus group, H. albidipes group, H. apiculatus group, H. baishanzuensis group, H. nanlingensis group, H. absimilis group, H. intactus group, H. longus group, H. fluvius group, H. prolongatus group, H. digitiformis group, H. biancistrus group, H. incisus group, H. digitatus group. As to the seven species distributed in Inner Mongolia, H. shennongjiensis Yang, 1997 belongs to the H. digitiformis group, H. chifengensis sp. nov. belongs to the H. nanlingensis group, and H. beijingensis Yang, 1996 belongs to the Hercostomus subnovus group, while H. dilatitarsis Stackelberg, 1949, H. neimengensis Yang, 1997, H. sinicus Stackelberg, 1934, and H. triangulatus sp. nov. were not assigned to any species group. Further studies are necessary in order to clarify their systematic placement.

Acknowledgements

We are very grateful to Dr. Xiao Zhang (Qingdao), Dr. Li Shi (Hohhot) and Dr. Xiumei Lu (Shanghai) for collecting specimens. This research was funded by Natural Science Foundation of Inner Mongolia (2020JQ04), National Science & Technology Fundamental Resources Investigation Program of China (Grant No. 2019FY100400) and Key Science and Technologies Program of Inner Mongolia (No. 2021ZD0011-2).

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