Lesteva (s. str.) concava, Cheng, Li & Peng, 2019

Cheng, Zhi-Fei, Li, Li-Zhen & Peng, Zhong, 2019, New species and new records of Lesteva Latreille, 1797 (Coleoptera Staphylinidae: Omaliinae) from China, Zootaxa 4560 (1), pp. 1-39 : 5-9

Lesteva (s. str.) concava, Cheng, Li & Peng , new species

( Figs 2B , 3 G–H, 5D–F, 24)

Type material (64 exs). Holotype: CHINA: ♂: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Qingliang (清 凉峰), 1050–1080 m, 8–10.v.2005, Zhu & Li leg. ’ / HOLOTYPE (red), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC . Paratypes: CHINA: 17 ♂♂, 34 ♀♀: same label data as holotype / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC ; 1 ♀: ‘ China: Anhui Prov. , Anqing City (安庆市), Qianshan County (潜山县), Mt. Tainzhu (天柱山), 1150–1250 m, 25.iv.2005, Hu & Tang leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC ; 1 ♀: ‘ China: Anhui Prov. , Chizhou City (池州市), Shitai County (石台县), Guniujiang N. R. (牯牛降自然保护区), alt. 300 m, 27.iv.2005, Hu & Tang leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC ; 1 ♀: ‘ China: Zhejiang Prov. , Hangzhou City (杭州 市), Anji County (安吉 县), Mt. Longwang (龙王 山), 300–500 m, 24.iv.2004, Jing-Wen Zhu leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC ; 2 ♀♀: ‘ China: Zhejiang Prov. , Hangzhou City (杭州市), Anji County (安吉县), Mt. Longwang (龙王山), 250–550 m, 24.iv.2006, Jin-Wen Li leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC ; 2 ♀♀: ‘ China: Zhejiang Prov. , Hangzhou City (杭州市), Anji County (安吉县), Mt. Longwang (龙王山), 1050–1200 m, 15.v.2013, Chen & Pan leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC ; 1 ♀: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Tianmu (天目山), 800–1150 m, 2.v.2001, Jiao-Yao Hu leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC ; 1 ♀: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Tianmu , (天目山), 800–1150 m, 31.v.2006, Hu & Tang leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC ; 1 ♂: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Tianmu , (天目山), 830–900 m, 31.v.2010, Wang, Xu & Zhu leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC ; 1 ♂, 1 ♀: ‘ China: Zhejiang Prov. , Quzhou City (衢州市), Jingning County (景宁 县), Baiyunlinqu (白云林区), 1100–1270 m, 07.v.2012, Jian-Qing Zhu leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC .

Description. Measurements (in mm) and ratios: BL 3.04–3.29; FL 2.36–2.48; HL 0.47–0.50; HW 0.59–0.62; PL 0.56–0.59; PW 0.65–0.68; EL 1.27–1.33; EW 1.18–1.21; HL/HW 0.75–0.79; PL/PW 0.86–0.90; EL/EW 1.07–1.11; HW/PW 0.90–0.95; PL/EL 0.44–0.46; AnL 1.39–1.42; AeL 0.46–0.50.

Habitus as in Fig. 2B . Reddish brown, head usually darker, blackish brown; mouthparts fuscous brown; antennae yellowish brown; elytra with small subtriangular yellow maculae near middle; legs reddish brown, except of paler apex of tibiae and tarsi. Pubescence of body pale, evident and recumbent.

Head subtriangular, coarsely and sparsely punctate, widest across eyes; eyes prominent, 1.86 times longer than temples; ocelli distinct, distance between ocelli 1.75 times as long as distance between ocellus and posterior margin of eye. Antennae elongate, relative lengths of the antennomeres I–XI: 1.54: 1: 1: 1: 1: 1: 1.15: 1.15: 1.15: 1.15: 1.77.

Pronotum subcordate, moderately convex, widest near anterior third; lateral margins arcuate at anterior twothirds and nearly straight at posterior third; punctation and pubescence as that on head; disc with shallow U-shaped depression. Scutellum subtriangular, surface with fine punctation and pubescence.

Elytra subtrapezoidal, gradually dilated posteriorly, posterior angles broadly rounded; punctation and pubescence distinctly finer and sparser than those on pronotum.

Abdomen broad, widest at segment IV (first visible abdominal segment), then distinctly narrowed posteriorly. Tergites with dense, fine punctation and decumbent pubescence, devoid of microsculpture; middle of the tergites IV and V with one pair of tomentose patches, but patches on tergite V smaller and less transverse.

Male. Apical margin of the tergite VIII ( Fig. 3G ) broadly concave; sternite VIII ( Fig. 3H ) transverse, apical margin weakly concave; median lobe of the aedeagus ( Figs 5 D–F) slightly longer than parameres; parameres somewhat asymmetrical, each slightly narrowed in anterior half, with three long apical setae; internal sac without sclerotized spines and without distinct dark membranous structures.

Female. Abdominal sternite VIII without concavity apically. In other morphological characters similar with males.

Comparative notes. Lesteva concava is closest to L. cooteri Rougemont in sharing similar body size, and punctation and pubescence of the head and pronotum. These two species can be readily separated by the different coloration of the body, and especially the narrower aedeagus with longer median lobe and narrower and longer parameres in L. concava . For illustrations of L. cooteri see Figs 6A , 8 A–B, 9A–C and Rougemont (2000: figs 1, 13).

Distribution and nature history. China: Anhui, Zhejiang ( Fig. 24 ). Some specimens were sifted from leaf litter near a stream in mixed deciduous forests at Mt. Tianzhu, Anhui.

Etymology. The new specific epithet refers to the broadly concave apical margin of the male tergite VIII.

Figures

FIGURE 2. Habitus (males) of Lesteva: A—L. cala; B—L. concava sp. nov. Scale bar: 1.0 mm.

FIGURE 3. Abdominal tergite VIII and sternite VIII (males): L. alesi (A—abdominal tergite VIII, B—abdominal sternite VIII); L. brevimacula (C—abdominal tergite VIII, D—abdominal sternite VIII); L. cala (E—abdominal tergite VIII, F— abdominal sternite VIII); L. concava sp. nov. (G—abdominal tergite VIII, H—abdominal sternite VIII). Scale bar: 0.1 mm.

FIGURE 5. Aedeagus of Lesteva (A–C. L. cala Male. D–F. L. concava sp. nov. Male): A–C. Aedeagus, in dorsal (A), ventral (B) and lateral (C) view; D–F. Aedeagus, in dorsal (A), ventral (B) and lateral (C) view. Scale bar: 0.2 mm.

FIGURE 6. Habitus (males) of Lesteva: A—L. cooteri; B—L. cordicollis. Scale bar: 1.0 mm.

FIGURE 8. Abdominal tergite VIII and sternite VIII (males, dorsal view) of Lesteva: L. cooteri (A—abdominal tergite VIII, B—abdominal sternite VIII); L. cordicollis (C—abdominal tergite VIII, D—abdominal sternite VIII); L. dabashanensis (E— abdominal tergite VIII, F—abdominal sternite VIII); L. elegantula (G—abdominal tergite VIII, H—abdominal sternite VIII). Scale bar: 0.1 mm.

FIGURE 24. Distribution of Lesteva concava in China.