Stenus mawenliae, Li, Wen-Rong, Tang, Liang & Li, Li-Zhen, 2013

Li, Wen-Rong, Tang, Liang & Li, Li-Zhen, 2013, A new species of the Stenus cephalotes group (Coleoptera, Staphylinidae) from Guangxi, South China, Zootaxa 3731 (3), pp. 386-390 : 387-390

Stenus mawenliae sp. n.

Figs. 1, 2 , 5–15

Type material (15 ♂♂, 25 ♀♀). Holotype: CHINA: Guangxi Prov.: ♂, Xing’an County, Mt. Mao’ershan, alt. 2000 m, 11.VII.2011, TANG Liang & HE Wen-Jia leg. (SNUC). Paratypes: CHINA: Guangxi Prov.: 1 ♂, 2 ♀♀, same data as holotype. (SNUC); 1 ♂, Xing’an County, Mt. Mao’ershan, alt. 2100 m, 10.VII.2011, TANG Liang leg. (SNUC); 1 ♂, 9 ♀♀, Xing’an County, Mt. Mao’ershan, alt. 2100 m, 9–10.VII.2011, TANG Liang & HE Wen- Jia leg. (SNUC); 1 ♂, 2 ♀♀, Xing’an County, Mt. Mao’ershan, alt. 2000–2140 m, 10.VII.2011, CHEN Yan, MA Wen-Li, PENG Zhong & ZHU Jian-Qing leg. (SNUC); 9 ♂♂, 8 ♀♀, Xing’an County, Mt. Mao’ershan, alt. 2000– 2140 m, 10.VII.2011, PENG Zhong leg. (SNUC); 3 ♀♀, Xing’an County, Mt. Mao’ershan, alt. 2000–2140 m, 10.VII.2011, ZHU Jian-Qing leg. (SNUC); 1 ♂, 1 ♀, Xing’an County, Mt. Mao’ershan, alt. 2000–2140 m, 10.VII.2011, PENG Zhong leg. (cPut).

Description. BL: 2.8–3.0 mm; FL: 1.5–1.7 mm.

HW: 0.68–0.75 mm, PW: 0.49–0.54 mm, PL: 0.53–0.59 mm, EW: 0.57–0.66 mm, EL: 0.50–0.58 mm, SL: 0.38–0.44 mm.

Brachypterous; moderately glossy, body blackish with head a little darker, elytra with trace of reddish spots, anterior margin of labrum, antennae, maxillary palpi and legs yellowish. Habitus see Figs. 1, 2 .

Head 1.11–1.18 times as wide as elytra; interocular area with deep longitudinal furrows, median portion convex and evenly punctate, slightly extending beyond the level of inner eye margins; punctures round, slightly confluent, slightly larger and sparser on median area than near inner margins of eyes, diameter of large punctures about as wide as basal cross section of 2nd antennal segment, interstices indistinctly reticulate, interstices mostly samller than half diameter of punctures. Antennae when reflexed reaching posterior margin of pronotum; relative length of antennal segments from base to apex as 10: 7: 14: 9: 9: 7: 7: 5: 6: 7: 7. Paraglossae oval.

Pronotum 1.08–1.13 times as long as wide, 0.83–0.86 times as wide as elytra; disk uneven, median longitudinal furrow distinct and impunctate medially; punctures round and slightly confluent, a little larger than those of head; interstices reticulated, smaller than half diameter of punctures.

Elytra 0.87–0.91 times as long as wide, disk relatively even with shallow longitudinal humeral impression, shallow postero lateral impression and elevated suture; punctation round and slightly confluent, same size to those on pronotum, punctures on trace of reddish spots shallower (which can be observed on separated elytron), interstices reticulated, smaller than half diameter of punctures.

Legs elongate, hind tarsi 0.65–0.71 times as long as hind tibiae, 4th tarsomeres distinctly bilobed.

Abdomen cylindrical; without paratergites; 7th tergite with narrow apical membranous fringe; punctures round to elliptic, gradually becoming smaller posteriad, interstices densely reticulate, varied from smaller than half to a little larger than one puncture diameter.

Male. Sternite VIII ( Fig. 5 ) with round emargination at middle of posterior margin; sternite IX ( Fig. 6 ) with very long apicolateral projections, posterior margin serrate and roundly emarginate; tergite X ( Fig. 7 ) with posterior margin broadlyrounded; Aedeagus ( Figs. 8, 9 ) with apical sclerotized portion of median lobe pointed at apex; expulsion hooks ( Fig. 11 ) large; parameres longer than median lobe, slightly swollen at apical third, each with 6–8 short setae at apico-internal margins.

Female. Sternite VIII ( Fig. 12 ) inconspicuously prominent at middle of posterior margin; tergite X ( Fig. 13 ) slightly broader than that of male. Valvifers ( Fig. 14 ) each with large apicolateral tooth; sclerotized spermatheca as in Fig. 15 .

Distribution. South China: Guangxi.

Bionomics. The type series were collected by sifting leaf litter of the forest floor. Habitat see Figs. 3, 4 .

Remarks. The new species can be separated from the related species by a combination of the following characters: elytra with trace of reddish spots, punctation of entire body mostly well-delimited, pronotum with longitudinal furrow impunctate medially; interstices of abdomen densely reticulate.

Etymology. The new species is named after Miss Wen-Li Ma, co-collector of the type series.

Figures

FIGURES 1, 2. Habitus of Stenus mawenliae in dorsal and ventral views. Scale = 1 mm.

FIGURES 5 – 15. Stenus mawenliae. 5 male sternite VIII 6 male sternite IX 7 male tergites IX, X 8, 9 aedeagus 10 apical portion of paramere 11 expulsion hooks 12 female sternite VIII 13 female tergites IX and X 14 valvifers and spermatheca 15 spermatheca. Scales: 0.1 mm for 10, 11, 15; 0.25 mm for 5 – 9, 12 – 14.

FIGURES 3, 4. Habitat of new species Stenus mawenliae.