Research Article |
Corresponding author: Zhengzhong Huang ( huangzz@ioz.ac.cn ) Corresponding author: Siqin Ge ( gesiqin12@hotmail.com ) Academic editor: Astrid Eben
© 2023 Zulong Liang, Alexander S. Konstantinov, Yongying Ruan, Zhiqiang Li, Zhengzhong Huang, Siqin Ge.
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:
Liang Z, Konstantinov AS, Ruan Y, Li Z, Huang Z, Ge S (2023) Two new species of the Longitarsus violentus group from China (Coleoptera, Chrysomelidae, Galerucinae, Alticini). ZooKeys 1181: 111-123. https://doi.org/10.3897/zookeys.1181.110538
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Two new species of Longitarsus Latreille, 1829 from China are described: L. pekingensis Liang, Konstantinov & Ge, sp. nov. (Beijing) and L. xinjiangensis Liang, Konstantinov & Ge, sp. nov. (Xinjiang). Images of dorsal and lateral habitus, pronotum, head, and male and female genitalia are provided. The records of Longitarsus violentus Weise, 1893 and Longitarsus weisei Guillebeau, 1895 in China are discussed. Holotypes of L. marguzoricus Konstantinov in Konstantinov & Lopatin, 2000 and L. violentoides Konstantinov in Konstantinov & Lopatin, 2000 are illustrated with images of pronotum and median lobe of aedeagus. A key to species of L. violentus species group is provided.
Beijing, flea beetles, Palearctic, taxonomy, Xinjiang
Longitarsus Latreille, 1829 is the most speciose genus of flea beetles and are widespread on all continents, except Antarctica, with more than 700 species worldwide (
Systematic studies of Chinese Longitarsus started relatively late. Although the first species occurring in China were described in the late 19th century (e.g.
As with many other species-rich flea beetle genera, Longitarsus may be divided into species groups. Some of them have been given a subgenus status (e.g. Testergus Weise, 1893) (
Two additional species clearly belonging to the L. violentus group were found in the insect collection of the Institute of Zoology, Chinese Academy of Sciences during our revisionary study of Chinese Longitarsus. One of them was later collected in Beijing. They are described below.
Male and female of the new species were dissected, and genitalia were mounted in a drop of glycerol on slides for photographing. Images of the habitus and male genitalia were taken by using a Zeiss AXIO Zoom V16 microscope, and photographs of the female genitalia were taken by using a Zeiss AXIO Scope A1 microscope. The morphological terminology used in this study follows
Specimens studied in this paper are deposited in the following collections:
Holotype
: ♂ (
Male body length 1.93–2.08 mm, width 0.95–1.07 mm; female body length 2.10–2.66 mm, width 1.02–1.32 mm. Body integument black with bronze reflection. Antennomeres I–V and legs yellowish to ferruginous, antennomeres VI–XI piceous. Metafemur black, dorsum with bronze reflection (Fig.
Head. Vertex impunctate, with weak transverse wrinkles and well-developed supraorbital punctures near orbital sulcus. Antennal callus poorly developed, subtriangular, delimited from vertex by a shallow, barely perceptible groove, surface smooth (Fig.
Thorax. Pronotum 1.33–1.37 times as wide as long. Lateral sides slightly convex, with maximum width in the middle. Anterolateral callosity well developed, slightly lower anteriorly, forming an acute angle. Lateral margin narrowly explanate. Posterolateral callosity low, slightly prominent. Punctures moderately large and dense, distance of interspace 1.5–2.1 times diameter of punctures. Interspaces weakly shagreened, stronger on pronotal disc (Fig.
Legs. Metatarsomere I of male 0.54 times as long as metatibia, 1.23 times as long as metatarsomeres II–IV combined. Metatibial spur 0.63 time as long as width of metatibia (Fig.
Abdomen. Preapical abdominal tergite of the female with distal area covered by short dense setae, extending forward to the middle at both sides but absent in the middle, sometimes middle area with few long setae. Apical abdominal tergite covered with long setae. A few minute microtrichia situated in the middle and lateral margins (Fig.
Male genitalia. Median lobe of aedeagus slightly wider at about apical fourth, apex rounded, without denticle. Ventral side with wide groove which follows shape of entire lobe (Fig.
Female genitalia. Receptacle of spermatheca slender, 1.92 times as long as wide. Inner side of receptacle convex, outer side nearly straight. Basal part of pump rather long, about as long as apical part, well delineated from receptacle and from apical part of pump; apical part about as long as width of receptacle, narrowly rounded apically. Spermathecal duct forms two loops (Fig.
Longitarsus pekingensis resembles L. violentus. It can be distinguished from the latter by the lack of sculpture on the vertex. Besides, the median lobe of aedeagus of L. pekingensis is more or less straight above basal opening in lateral view, without an apical denticle. Receptacle of spermatheca of L. pekingensis is more slender than that of L. violentus, and less convex on the inner side; the loops on the spermathecal duct are narrower in diameter. The key below allows to distinguish this species from all other species in the group.
The species is named after the type locality. The epithet is a noun in apposition.
Known from Changping District and Haidian District in Beijing, China.
Bothriospermum chinense Bunge (Boraginaceae).
Holotype
: ♂ (
Male body length 1.65–1.72 mm, width 0.78–0.90 mm; female body length 1.87–2.08 mm, width 0.89–1.18 mm. Body integument dark brown to black with bronze reflection. Apical part of antennomeres I–III yellowish to ferruginous, the rest part of antennae piceous. Legs ferruginous to piceous, metafemur black; dorsum with bronze reflection (Fig.
Head. Vertex strongly shagreened, with well-developed supraorbital punctures near orbital sulcus. Antennal calli poorly developed, subtriangular, barely delimited from vertex, surface smooth (Fig.
Thorax. Pronotum transverse, 1.44 times as wide as long. Lateral sides slightly convex, with maximum width at middle. Lateral margin of pronotum slightly angulate in front of middle (Fig.
Leg.
Metatarsomere I of male 0.51 times as long as metatibia, 1.07 times as long as metarsomeres II–IV combined (Fig.
Abdomen. Distal part of preapical abdominal tergite of female with two subquadrate areas on each side near apical part covered by short dense setae. Apical abdominal tergite covered with long setae. A few tiny microtrichia situated at middle (Fig.
Male genitalia. Median lobe of aedeagus in ventral view with sides nearly parallel to each other, apex with poorly developed denticle. Ventral groove wide (Fig.
Female genitalia. Receptacle of spermatheca oval, 1.58 times as long as wide. Inner side of receptacle more convex than outer side. Basal part of pump rather long, about half as long as apical part, well delineated from receptacle and from apical part of pump; apical part longer than width of receptacle, widely rounded apically. Spermathecal duct forms two U-shaped turns (Fig.
The key below allows for distinguishing L. xinjiangensis from all other species in the group. In addition, L. xinjiangensis is similar to L. violentus and L. violentoides. However, the elytra of L. xinjiangensis are slender, and the punctures on pronotum are larger. Compared to L. violentus, the antennomeres IV–VI of L. xinjiangensis are much darker, the median lobe of the aedeagus is broader, and the apex lacks an obvious denticle. Besides, the apex of the spermathecal pump of L. xinjiangensis is broader than that of L. violentus, and the spermathecal duct forms two U-shaped turns instead of loops. Longitarsus xinjiangensis can be distinguished from L. violentoides by the following characters: antennomere II shorter than IV; aedeagus narrow in lateral view; and apical part of spermathecal pump longer than width of receptacle.
The species is named after the type locality. The epithet is a noun in apposition.
1 | Vertex smooth, without perceptible sculpture (Fig. |
L. pekingensis Liang, Konstantinov & Ge, sp. nov. |
– | Vertex strongly shagreened, or at least with transverse wrinkles (Figs |
2 |
2 | Interspaces on pronotum strongly shagreened (Fig. |
3 |
– | Interspaces on pronotum not strongly shagreened, smooth, or covered by wrinkles (Fig. |
6 |
3 | Basal part of antennomere I reddish brown (Fig. |
L. pinguis Weise |
– | Basal part of antennomere I piceous (Fig. |
4 |
4 | Dorsal surface with a light purple tint (Fig. |
L. weisei Guillebeau |
– | Dorsal surface with a bronze or greenish tint (Figs |
5 |
5 | Last abdominal tergite of female with lateral microtrichia (see fig. 16 in |
L. violentus Weise |
– | Last abdominal tergite of female without lateral microtrichia (see figs 14, 15 in |
L. marguzoricus Konstantinov |
6 | Pronotum with relatively large and densely placed punctures, distance of interspace 0.9–1.7 times as diameter of punctures (Fig. |
L. xinjiangensis Liang, Konstantinov & Ge, sp. nov. |
– | Pronotum with relatively small and sparsely placed punctures, distance of interspace 2.1–3.8 times as diameter of punctures (Fig. |
L. violentoides Konstantinov |
As currently understood Longitarsus violentus group contains seven species. This number will undoubtedly increase when Central and Middle Asian faunas, as defined by
We are very grateful to Prof. Xingke Yang (Institute of Zoology, Guangdong Academy of Sciences, Guangzhou) for his professional opinions on preparing and revising the manuscript. We thank Dr Meiying Lin (Mianyang Normal University, Sichuan) and Mr Dakang Zhou (National Botanical Garden, Beijing) for offering some material of the new species.
The authors have declared that no competing interests exist.
No ethical statement was reported.
This work was supported by the Third Xinjiang Scientific Expedition Program (grant no. 2021xjkk0605 to SQG), the National Science Foundation of China (grant no. 32270460 to SQG), and the Biodiversity Survey and Assessment Project of Beijing, and the Biodiversity Survey and Assessment Project of the Ministry of Ecology and Environment, China (grant no. 2019HJ2096001006).
Conceptualization: ASK, ZH, ZL. Funding acquisition: SG. Project administration: SG. Supervision: SG, ZH. Visualization: ZL, ASK. Writing – original draft: ZL. Writing – review and editing: SG, YR, ZL, ZH, ZL, ASK.
Zulong Liang https://orcid.org/0000-0002-1289-2697
Alexander S. Konstantinov https://orcid.org/0000-0001-6578-6735
Yongying Ruan https://orcid.org/0000-0002-5025-5592
Zhengzhong Huang https://orcid.org/0000-0002-0085-6218
All of the data that support the findings of this study are available in the main text.