Chydaeus andrewesi kumei
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Ordo: Coleoptera
Familia: Carabidae
Genus: Chydaeus
Name
Chydaeus andrewesi Ito, 1992 stat. n. – Wikispecies link – Pensoft Profile
- Chydaeus kumei Ito, 1992: 52
- ? Chydaeus (Chydaeus) guangxiensis Ito, 2006: 198
Material examined
A total of 35 specimens (25 males and 10 females, including 1 male in IOZ and 24 males and 10 females in cFED, cSCH, cWR, and ZIN) were examined from the following localities: China. Yunnan Province. Jinping County: 1 male, Fenshuiling, Leidazhan, roadside, 22°51'41.0"N, 103°13'40.5"E, 2060 m, 17.XII.2003, H.B. Liang leg. (IOZ). Vietnam. Lao Cai Province: 2 males, 2 females, 6 km W of Sa Pa, N slope of Phansipan Mt. Area, 2000–2100 m, near Tram don (base of Hoang Lien Nature Park), 22°21'N, 103°46'E, V.2005, A.V. Abramov leg. (Exp. of Russia-Vietnam Tropical Centre) (ZIN); 1 female, same data, but 1930-2000 m, V.2010, A.V. Abramov leg. (ZIN); 18 males, 6 females, 6 km W of Sa Pa, northern slope of Phansipan Mt. area, May 2008, A.V. Abramov leg. (Exp. of Russia-Vietnam Tropical Centre) (cSCH, cWR, ZIN); 4 males, 1 female, Sa Pa env., ca 1600 m, V.2006, A. Anitchkin leg. (cFED).
Distribution
Fig. 60. Previously, this taxon was known only from the single male collected in Sa Pa, northern Vietnam. Based on the new records presented here, this species occurs not only in the mountains of northern Vietnam, but also in southern Yunnan Province (China) adjacent to the Vietnamese border.
Habitat
Specimens were collected in roadside and road cut open areas and other disturbed areas adjacent to moderately disturbed forest (Fig. 74), hidden under stones and other debris during daylight hours.
Remarks
Based on Ito’s original description, Kataev and Schmidt (2006)[1] treated Chydaeus kumei as a distinct species of the obscurus group, closely related to Chydaeus andrewesi as characterized by Ito (1992)[2]. Examination of specimens of Chydaeus kumei revealed that this taxon possesses all the distinctive features of Chydaeus andrewesi listed by Kataev and Schmidt (2006)[1], including the elongate metepisterna (in both taxa, their length along inner margin is much greater than the width along the anterior margin). Moreover, the structure of the aedeagus in Chydaeus kumei males (Figs 47–50) is virtually identical to that in Chydaeus andrewesi males and, in our opinion, Chydaeus kumei should be treated as a subspecies of Chydaeus andrewesi. The vicariant distributions of these taxa in Yunnan also supports the subspecific status of Chydaeus kumei.
The main distinctive characters of adults of Chydaeus andrewesi kumei are: pronotum markedly narrowed basad, distinctly depressed and comparatively coarsely punctate laterobasally; pronotal basal angles each with a denticulate apex protruded laterad; elytral disc in males with very fine, more or less markedly effaced microsculpture comprised of thin, transverse meshes; proepisterna distinctly punctate anteriorly; and base of the terminal lamella of the median lobe of aedeagus (Fig. 47) slightly wider than that of other subspecies. We add the following mensural features to Ito’s description: Size: Body length 8.6–10.2 mm, width 3.8–4.5 mm. Proportions: HWmax/PWmax = 0.71–0.74; HWmin/PWmax = 0.59-0.63; PWmax/PL = 1.41–1.48; PWmax/ PWmin = 1.26–1.40; EL/EW = 1.38–1.43, EL/PL = 2.39-2.59 (2.39–2.51 in male and 2.42–2.59 in female), W/PWmax = 1.19–1.29.
Specimens of Chydaeus andrewesi kumei are very similar to those of Chydaeus andrewesi szetschuanus from Sichuan in morphological features, particularly in the shape of the pronotum (with denticulate basal angles), the punctate proepisterna, and the relatively wide elytra; but they differ from the latter mainly in having finer and sparser punctation on the apical half of the pronotum (pronotum densely and coarsely punctate anteriorly in Chydaeus andrewesi szetschuanus specimens).
Chydaeus guangxiensis Ito, 2006 was described from one male from Guangxi ("Below Tienshan Ping, Mt. Miao'er, Xing'an Xian”). We examined two females from the same mountain [one labeled: “Guangxi, Mt. Miao’er, 2000m, 1985.VIII.1, Song Shimei leg. (IOZ); for the other, see Kataev and Schmidt (2006[1]: 145)], that matched the original description of Chydaeus guangxiensis very well. Judging from Ito's original drawings (2006: Fig. 4), the aedeagus of Chydaeus guangxiensis males is identical to that of Chydaeus andrewesi males. The pronotum of Chydaeus guangxiensis adults is smooth or finely punctate anteriorly, as in Chydaeus andrewesi kumei adults, but the denticle at each basal pronotal angle is only slightly evident or absent, as in Chydaeus andrewesi andrewesi specimens. Further study, based on additional specimens, is necessary to determine the taxonomic status of Chydaeus guangxiensis; but it is very likely that this taxon is either consubspecific with Chydaeus andrewesi kumei or, at most, another subspecies of Chydaeus andrewesi.
Taxon Treatment
- Kataev, B; Liang, H; Kavanaugh, D; 2012: Contribution to knowledge of the genus Chydaeus in Xizang Autonomous Region [Tibet] and Yunnan Province, China (Coleoptera, Carabidae, Harpalini) ZooKeys, 171: 39-92. doi
Other References
- ↑ 1.0 1.1 1.2 Kataev B, Schmidt J (2006) To the knowledge of the genus Chydaeus Chaudoir, 1854 (Coleoptera, Carabidae, Harpalini). II. Revision of the C. obscurus, C. semenowi (in new sense), and C. salvazae species-groups of the Himalaya and adjacent areas. In: Hartmann M Weipert J (Eds). Biodiversitat und Naturausstattung im Himalaya – Biodiversity and natural heritage of the Himalaya, Bd. II.Verein der Freunde und Foderer des Naturkundemuseums Erfurt e. V., Erfurt: 133-174.
- ↑ Ito N (1992) Study on Asian Carabidae, IV. (Coleoptera). Entomological Review of Japan 47: 43-57.
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