Research Article |
Corresponding author: Jing Li ( lijing1976416514@163.com ) Corresponding author: Yuyu Wang ( wangyy_amy@126.com ) Academic editor: Pavel Stoev
© 2019 Na Jia, Xu Su, Jing Liu, Weicheng Lu, Guodong Ren, Jing Li, Yuyu Wang, Yanchen 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:
Jia N, Su X, Liu J, Lu W, Ren G, Li J, Wang Y, Zhao Y (2019) Taxonomy of Cyrtomorphus Lacordaire (Coleoptera, Erotylidae, Tritomini) from China. ZooKeys 886: 155-161. https://doi.org/10.3897/zookeys.886.37991
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In this paper, a key to separate the Chinese species of genus Cyrtomorphus Lacordaire is provided for the first time. A new species, Cyrtomorphus rufobrunneus sp. nov., is described and illustrated, and one species, Cyrtomorphus connexus Gorham, 1896 is newly recorded to China.
Cucujoidea, description, key, new species.
The genus Cyrtomorphus was established by
The genus Cyrtomorphus (Coleoptera, Erotylidae, Tritomini) included 35 species worldwide (
Before the present study, all taxonomic research on Cyrtomorphus in China was at least 50 years ago. But recently, specimens of Cyrtomorphus were collected and deposited in Museum of Hebei University (MHU). One new species was found among 52 specimens, Cyrtomorphus rufobrunneus sp. nov., from Guizhou Province, and is described and illustrated. A second species, Cyrtomorphus connexus Gorham, 1896, is recorded from China for the first time. Additionally, a key to the seven species from China is included.
The abdominal segments and the genitalia were detached from the body after softening in hot water. Male or female genitalia were put in 5% NaOH boiling solution for 5 minutes and then cleaned with distilled water. Morphological characters were observed using a Nikon SMZ800N stereomicroscope. Photographs were taken with Cannon Eos 5D Mark III camera and Canon EF 100mm f/2.8L Macro IS USM lens and modified with Adobe Photoshop CC 2016. The species distribution was inferred from examined materials and published records. The specimens studied were deposited in MHU.
1 | Pronotum coloration uniformly black | C. yunnanus Mader |
– | Pronotum coloration not monochrome, with color pattern | 2 |
2 | Pronotum, except for the outer margin, brownish black | C. rufobrunneus sp. nov. |
– | Pronotum with two or more patches | 3 |
3 | Four black spots on pronotum | C. connexus Gorham |
– | Two black flecks in the pronotum | 4 |
4 | Elytron with four black marks | 5 |
– | Elytron with five black marks | 6 |
5 | Pronotum with two spots on basal margin | C. chinensis Mader |
– | Pronotum with two spots on frontal margin | C. duxoides Mader |
6 | Elytron suture with two united patches | C. liui Chûjô |
– | Elytron suture without united patches | C. duodecimmaculatus Araki |
Holotype. CHINA: ♂; fully matured beetle (MHUB01223). Guizhou, Libo County, Maolan National Nature Reserve, 25.3112N, 108.0761E, alt: 755m, 20 July 2015, Caixia Yuan leg.
Paratypes. CHINA: 2 ♂♂, 2 ♀♀, (MHUB01224–MHUB01227), same data as for holotype.
Body oval convex, widest at base of elytra. General color red-brown, legs and antennae black, antennomere I and II paler, pronotum except the outer margin brownish black, each elytron with a brownish-black band. Clypeus with the anterior border emarginated, clypeofrontal sulcus completed. Antennomere III about 1.5 times as long as IV; relative lengths of antennomeres II–XI: 40: 100: 62: 55: 55: 52: 50: 125: 105: 70. Terminal segment of maxillary palpus asymmetrical triangular, nearly half as long as wide. Pronotum with anterior border directly opposite head, slightly projecting forwards in the middle. Pro-, meso-, and metacoxal lines present.
Length: 7.0–9.5 mm, width: 4.5–6.0 mm. Body oval, almost hemispherical, convex, shiny and smooth, widest at base of elytra, general color red-brown, legs and antennae black (antennomeres I–II paler). Pronotum except the outer margin brownish black. Markings on pronotum can differ depending on age; some with a broad, lateral, brownish-black band that almost reaches front and basal margin. Scutellum red-brown, both sides darker. One brownish black band on each elytron, with the color becoming paler from base to apex (Figs
Head
(Fig.
Pronotum
(Fig.
Scutellum heart-shaped, with fine punctures.
Elytra widest at base, EL/EW ratio 1.1, gradually narrowing to apex. Each elytron with six or seven indistinct striae; intervals finely punctured.
Prosternum
(Fig.
Mesoventrite (Fig.
Metaventrite coarsely and sparsely punctured in the middle, without punctures on each side of base, with a longitudinal depression on posterior 5/6; coxal lines extending to basal one-third of metaventrite.
Abdomen with coarse and dense punctures laterally, puncture size 2.5 times facet; punctures smaller medially, 0.5 times facet, with short golden setae; long coxal lines on first ventrite nearly attaining posterior border.
Male genitalia
(Fig.
Female genitalia
(Fig.
Middle tibia of male without a row of protuberances on the inner surface.
Cyrtomorphus rufobrunneus sp. nov. 3 head 4 antenna 5 maxillary palpus 6 mentum 7 pronotum 8 prosternum 9 mesoventrite 10 male genitalia in lateral view 11, 12 lateral and dorsal views of anterior end of male flagellum 13 female genitalia in ventral view 14 female spermatheca. Scale bars: 1 mm (a), 0.5 mm (b).
China: Guizhou.
Cyrtomorphus rufobrunneus sp. nov. is similar to Cyrtomorphus duodecimaculata Araki, 1941 in its form and body color. The new species can be distinguished by each elytron bearing a brownish-black band, the pronotum having a projecting posterior angle, the prosternal lines straight, and males without a row of protuberances on the inner surface of middle tibia. In contrast, Cyrtomorphus duodecimaculata has five black marks on each elytron, the pronotum has obtuse posterior angles, the prosternal lines curved, males have a row protuberances on the inner surface of the middle tibia.
The species is named for the red-brown body color.
Cyrtomorphus connexus Gorham, 1896: 286.
CHINA: 3♂♂, 4 ♀♀, Yunnan, Mengla County, Mohan Town, 21.0624N, 102.3077E, 3–4 July 2006, Guodong Ren, Wenjun Hou & Yalin Li (MHU) leg.
New for China (Yunnan), Burma.
The original description was based on the unique type specimen from Karen Hills, Burma (
We are grateful to Prof. Guodong Ren, Wenjun Hou, Yalin Li, and Caixia Yuan (all MHU) for their help with specimen collections. We thank Dr Xinglong Bai (MHU) for his assistance in preparation of the manuscript. This work was supported by the State Natural Sciences Foundation Monumental Projects of China (no. 31750002).