Research Article |
Corresponding author: Ping You ( youping@snnu.edu.cn ) Corresponding author: Zhenhua Liu ( liuzhh22@mail2.sysu.edu.cn ) Academic editor: Christopher Majka
© 2024 Yuqi Wang, Zhiqiang Li, Ping You, Zhenhua Liu.
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:
Wang Y, Li Z, You P, Liu Z (2024) Contribution to the Chinese Intybia Pascoe, 1866 (Coleoptera, Melyridae, Malachiinae), with descriptions of two new species groups and one new species. ZooKeys 1202: 329-341. https://doi.org/10.3897/zookeys.1202.115935
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A contribution to the knowledge of the malachiine genus Intybia Pascoe, 1866 from China is given. Two new species groups: Intybia klapperichi group and Intybia eversi group are defined and described. A new species, Intybia hainanensis Wang & Liu, sp. nov., of the Intybia klapperichi group is described from Hainan Province. Intybia erectodentatus (Wittmer, 1982) and Intybia concha Asano, 2015 are redescribed based on new materials collected in mainland China. A key to species groups of the genus Intybia Pascoe, 1866 in China is provided.
Apalochrini, Cleroidea, Hainan, key, redescription, taxonomy
The genus Intybia Pascoe, 1866 belongs to the tribe Apalochrini of malachiine Melyridae, which is represented by about 170 species from the Asiatic region, making it one of the most diverse genera within the tribe Apalochrini (
Research on the genus Intybia is relatively abundant in some Asian regions, including Japan (
Intybia specimens involved in this study are deposited in the following institutions: IZGAS–Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, China;
Specimens for dissections were cleared in a 10% solution of KOH for about 10 h at room temperature. The abdomen with the aedeagus was transferred to a cavity slide using fine forceps and the aedeagus was separated from the abdomen using a hooked, fine dissecting needle. Specimens were mounted on cards with white emulsion glue. Genitalia and terminal abdominal segments are preserved in genitalia vials with glycerol.
The habitus images were captured using a Canon 7D DSLR camera, Canon MP–E 65 mm macro lens and Mitutoyo 5× objective lens, mounted on a WeMacro Focus Stacking Rail, with Helicon Remote 3.9.10 and WeMacro software for focus stacking. Male genitalia were photographed using a Zeiss AxioCam HRc digital camera mounted on a Zeiss AX10 compound microscope with the Axio Vision SE64 4.8 software. Layered images of the male genitalia were stacked in Helicon Focus software and edited in Photoshop CC 2022.
The morphological terms used in this paper follow
Melyridae Leach, 1815
Malachiinae Fleming, 1821
Intybia klapperichi group
Diagnosis. Body size small (less than 2.5 mm). Head black with anterior area yellow, pronotum and elytra entirely black; antenna with basal three segments yellow, antennomeres 4–11 brownish to dark brown; legs yellow with basal 4/5 of femora brown to black (Figs
Included species. Intybia erectodentatus (Wittmer, 1982), Intybia hainanensis Wang & Liu, sp. nov., Intybia klapperichi (Hicker, 1949).
Distribution. Only known from China: Fujian, Guangdong, Hainan, Taiwan.
Holotype : China • ♂; Hainan, Ledong, Jianfengling; 18.731273°N, 108.873082°E; 17 Mar. 2021; Yuchen Zhao leg; IZGAS. Paratype: • 1 ♂; same data as for holotype.
This species is similar to Intybia erectodentatus (Wittmer, 1982) and Intybia klapperichi (Hicker, 1949) in body shape and colouration. It can be easily recognized by the shape of antennomere 3 (Fig.
Male. Length 2.0–2.1 mm. Head yellow, with areas behind middle of eyes black on dorsal surface, frons with darker median spot (Fig.
Head widest across eyes, nearly as wide as pronotum; dorsal surface flat, covered with dense short setae, clypeus divided into sclerotized postclypeus and membranous anteclypeus; frons weakly depressed, slightly constricted in front of eyes. Eyes relatively large and laterally protruding. Antenna with 11 segments; scape subtriangular, elongated with slightly enlarged apex; antennomere 3 enlarged and suboval, inner edge with inwardly twisted projections; antennomeres 4–11 covered with short white setae. Labrum transverse, dorsal surface convex. Mandibles bidentate apically, slightly blunt, inner margin straight. Maxillary palps with 4 segments, last segment enlarged and obliquely truncated; labial palps 3 with segments, segment 1 very short, segment 3 conical.
Prothorax transverse; pronotum about 0.7 times as long as wide, widest at about basal third, distinctly constricted at base (Fig.
Elytra about 1.4 times as long as wide, pear-shaped, widest at about anterior third; humeri rounded and slightly elevated. Surface covered with short white setae. Mesoventrite and metaventrite covered with white setae. Mesoventrite short and subtriangular; mesocoxal cavities large, contiguous at middle, laterally open to mesepimeron; mesocoxae subtriangular, apex slightly swollen, distinctly projecting. Metaventrite enlarged; discrimen distinct, not extending to center, lateral areas with punctures; metanepisternum broad, narrowed posteriorly. Metacoxae transverse, subtriangular, sharply narrowed beside trochanter.
Legs (Fig.
Abdomen with 6 freely movable ventrites; ventrite 1 divided by metacoxae; ventrites 2–4 subequal in length and gradually decreasing in width. Ventrites 2–6 covered with white to light yellow setae on both sides, with longer setae on the last 2 ventrites. Tergite VIII (Fig.
Female. Unknown.
The species name is derived from the province Hainan, where the type specimens were collected.
Hainan.
Holotype
: China • ♂; Fujian, Kwangtseh; 1 Sept. 1937; J. Klapperich leg.;
China • 2 ♂, 4 ♀; Guangdong, Shaoguan City, Ruyuan, Nanling National Forest Park; 24.88487°N, 113.03585°E; 9 May 2023; Zhenhua Liu, Yuqi Wang and Liye Wei leg.; net sweeping; IZGAS.
It can be distinguished from the other two species within the species group by shape of antennomere 3 (Fig.
Male. Length 2.0–2.4 mm. Head yellow, with areas behind middle of eyes black on dorsal surface (Fig.
Head widest across eyes, nearly as wide as pronotum; dorsal surface flat, covered with short setae; clypeus divided into sclerotized postclypeus and membranous anteclypeus; frons slightly constricted in front of eyes. Eyes large and laterally protruding. Antenna with 11 segments; scape elongated and subtriangular; antennomere 3 suboval, inner margin with a hammer-shaped projection twisting towards posterior (Fig.
Prothorax transverse; pronotum about 0.7 times as long as wide, widest at about half; margins smooth, without distinct angles; anterior margin evenly arched, posterior margin nearly straight. Surface densely covered with white short setae. Prosternum short, protrochantin exposed. Procoxal cavities transverse and contiguous at middle; procoxae enlarged, subtriangular. Scutellum subtrapezoid, posterior margin nearly truncated.
Elytra about 1.4 times as long as wide, widest at about anterior third, lateral margins slightly curved; humeri slightly elevated. Surface densely covered with white setae, longer than those on pronotum, punctation indistinct. Mesoventrite transverse and subtriangular; mesocoxal cavities contiguous at middle, laterally open to mesepimeron; mesocoxae enlarged and subtriangular, distinctly projecting, trochantins exposed. Metaventrite transverse, slightly swollen, metanepisternum broad at base, narrowed posteriorly. Metacoxae transverse, subtriangular, sharply narrowed beside trochanter.
Legs (Fig.
Abdomen with 6 freely movable ventrites. Ventrites with long setae on the sides, longer setae on ventrites 4–6. Tergite VIII with posterior margin emarginate (Fig.
Female. Similar to male in body shape and colouration (Fig.
Fujian, Guangdong.
Intybia eversi species group
Diagnosis. Head, pronotum, scutellum and elytra black, elytra with metallic blue luster (Fig.
Remarks.
Included species. Intybia concha Asano, 2015, Intybia eversi (Hicker, 1949).
Distribution. Only known from China (Guangdong, Jiangsu, Shaanxi, Taiwan).
Holotype
: China • ♂; Fujian, Kwangtseh; 17 July 1937; J. Klapperich leg.;
China • 1 ♂, 1 ♀; Zhejiang, Shaoxing City, Yuecheng District, Fusheng Town; 29.94070°N, 120.73935°E; 14 July 2020; Yuchen Zhao leg.; net sweeping; IZGAS; • 1 ♂; Hubei, Huanggang City, Macheng Aimenguan; 565 m; 31.3856863°N, 115.3231569°E; Fei Ye and Yuqi Wang leg.; IZGAS • 3 ♀; Guangdong, Shaoguan City, Nanling National Forest Park first peak; 24.91971°N, 112.974713°E; 1541 m; 24 Aug.–28 Sept. 2022; Wenfeng Li and Ruonan Zhang leg.; malaise trap; IZGAS.
This species can be distinguished by its scape with a dark stripe along the inner margin (Fig.
Male. Length 2.7–3.2 mm. Head black, with areas between antennal insertions and anteclypeus yellowish; labrum black at base, apical area yellow, maxillary palps with apex of terminal segment dark yellow. Antenna with basal 3 segments yellow, base of scape black, antennomere with dark stripe along anterior edge on dorsal surface; antennomere 4–11 brownish to dark brown (Fig.
Head widest across eyes, narrower than pronotum; dorsal surface flat, with distinct midcranial suture; frons slightly constricted in front of eyes; clypeus divided into sclerotized postclypeus and membranous anteclypeus. Eyes large and conspicuously prominent. Antenna with 11 segments; scape subtriangular, with apex distinctly dilated; antennomere 3 strongly transverse, with large transverse concavity, inner edge slightly pointed; antennomeres 4–11 covered with dense white short setae. Labrum transverse and large, nearly semicircular, apical margins strongly arched. Maxillary palps with 4 segments with terminal segment dilated and obliquely truncate; labial palps with 3 segments with terminal segments conical.
Pronotum slightly transverse, about 0.8 times as long as wide, widest at about basal third; lateral margins strongly constricted at base, anterior margin curved, posterior margin almost straight (Fig.
Elytra about 1.2 times as long as wide, widest at about apical third, ovoid; humeri slightly elevated; surface covered with dense fine punctures at middle, remaining areas nearly smooth, covered with dense short setae. Mesoventrite elongated; mesocoxal cavities contiguous at middle, laterally open to mesepimeron; Mesocoxae large and triangular, ventrally protruding. Metaventrite slightly swollen, with short discrimen; metacoxae transverse, subtriangular, sharply narrowed beside trochanters.
Legs slender, femora slightly swollen, covered with white short setae; tibiae slender, with denser setae than femora, which is even denser on inner surface of fore tibiae. Tarsal formula 5–5–5, front tarsi distinctly shorter; terminal tarsomere with pair of symmetrical small claws and membranous appendages underneath.
Abdomen with 6 freely movable ventrites; ventrites 1–4 subequal in length, longer than apical 2 segments, ventrites 4–6 gradually narrowed to apex. Tergite VIII (Fig.
Female. Similar to male in body shape and colouration (Fig.
Fujian, Guangdong.
On the basis of species group designations proposed by
1 | Elytra monochrome, without spot or stripe | 2 |
– | Elytra not monochrome, with whitish, yellowish or orange spots or stripes | 4 |
2 | Thorax orange-red; elytra dark blue with metallic luster, with dense and coarse punctuation | Intybia rubrithorax group |
– | Thorax black; elytra black, with or without metallic blue luster, without distinct. punctation | 3 |
3 | Elytra black with metallic blue luster, head with frons black; pronotum strongly constricted at base; body length more than 3.5 mm | Intybia eversi group |
– | Elytra black without metallic luster, head with frons yellow; pronotum gradually constricted to base; body length less than 2.5 mm | Intybia klapperichi group |
4 | Thorax orange-red; elytra with two transverse orange stripes mixed with white, which are connected along the suture | Intybia venusta group |
– | Thorax black; elytra with one transverse stripe or three whitish spots | 5 |
5 | Elytra black without metallic luster, with three whitish spots, one at about anterior third and two subapical | Intybia guttata group |
– | Elytra black, sometimes with metallic luster, with one yellow to orange transverse stripe before middle, sometimes continuous across suture | Intybia pelegrini group |
We would like to sincerely thank Dr Dirk Ahrens of
The authors have declared that no competing interests exist.
No ethical statement was reported.
This project is supported by the National Natural Science Foundation of China (no. 32200374, no. 32070471 and no. 31702039), and GDAS Special Project of Science and Technology Development (2022GDASZH-2022010106, 2020GDASYL-20200102021).
Conceptualization: ZL. Funding acquisition: ZL, ZL. Project administration: ZL. Supervision: ZL. PY. Visualization: YW, ZL. Writing–original draft: YW. Writing–review and editing: ZL, ZL, PY.
Yuqi Wang https://orcid.org/0009-0002-0311-8445
Zhiqiang Li https://orcid.org/0000-0003-0064-7165
Ping You https://orcid.org/0000-0002-2913-1544
Zhenhua Liu https://orcid.org/0000-0002-2739-3305
All of the data that support the findings of this study are available in the main text.