Linan arcitibialis, Zhang, Yu-Qing, Li, Li-Zhen & Yin, Zi-Wei, 2018

Zhang, Yu-Qing, Li, Li-Zhen & Yin, Zi-Wei, 2018, Six new species and a new record of Linan Hlavac in China, with a key to species (Coleoptera, Staphylinidae, Pselaphinae), ZooKeys 793, pp. 115-133 : 116-118

Linan arcitibialis sp. n. Figs 1A, 2, 11A

Type material.

(36 ♂♂, 40 ♀♀). Holotype: CHINA: ♂: 'China: Hubei, Enshi Tujia and Miao Autonomous Prefecture, Xingdoushan N. R. (星斗山自然保护区), San-xian-chang (三县场), 30°2'20.48"N, 109°8'33.89"E, 1114 m, 20.v.2017, sift, Zhou GC, Tian T, & Huang ZG leg.' (SNUC). Paratype: CHINA: 4 ♂♂, 8 ♀♀, same label data as holotype; 15 ♂♂, 16 ♀♀, same label data, except ‘19.v.2017’; 11 ♂♂, 15 ♀♀, same label data, except ' 30°2'46.03"N, 109°7'49.39"E, 1205 m, 18.v.2017'; 1 ♂, same label data, except ' 30°2'29.98"N, 109°8'1.60"E, 1253 m, 18.v.2017'; 1 ♂, 'China: Hubei, Enshi Tujia and Miao Autonomous Prefecture, Changtanhe (长潭河), Lianghekou Village (两河口村), 30°0'6.00"N, 109°44'27.36"E, 1234 m, 14.v.2017, sift, Zhou GC, Tian T, & Huang ZG leg.'; 1 ♂, 'China: Hubei, Enshi Tujia and Miao Autonomous Prefecture, Xianfeng Hsien (咸丰县), Huangjindong Country (黄金洞乡), Maliuxi Village (麻柳溪村), 29°57'34.15"N, 109°1'15.82"E, 752 m, 24.viii.2017, sift, Zhou GC & Irfan M leg.'; 2 ♂♂, 1 ♀, 'China: Chongqing City, Pengshui Hsien(彭水县), Moweishan Scenic Spot (摩围山风景区), 29°11'11.15"N, 108°2'59.32"E, 1234 m, 1568 m, 25.vii.2017, sift, Zhou GC & Irfan M leg.' (all in SNUC).

Diagnosis of male.

Length 2.71-2.77 mm; antennomere IX expanded laterally, with small process near apex; long metaventral processes narrowing toward apex; protibia with distinct apical spine; mesotibia strongly arched; metatrochanter with short, blunt ventral projection.

Description.

Male (Figure 1A). Length 2.71-2.77 mm. Head slightly longer than wide, HL 0.62-0.63 mm, HW 0.55-0.56 mm; eyes small, each composed of about 24 facets. Antennal scape elongate, about 3.3 times as long as wide, antennomeres II–VIII similar, each about as long as wide, antennomere IX (2A) much longer than wide, an gularly expanded laterally at basal third, with small rounded process near apex, antennomeres X–XI simple. Pronotum (Figure 2B) about as long as wide, PL 0.57-0.58 mm, PW 0.55-0.57 mm. Elytra much wider than long, EL 0.60-0.63 mm, EW 0.93-0.95 mm. Metaventral processes (Figure 2C) long, narrowing apically. Protrochanter and profemur simple (Figure 2D), protibia with small but distinct spine (Figure 2E) at apex; mesotrochanter simple, mesofemur expanded ventrally at middle (Figure 2F), mesoti bia (Figure 2G) strongly arched at basal 2/5; metatrochanter (Figure 2H) with short, blunt ventral projection. Abdomen slightly wider than elytra, AL 0.92-0.93 mm, AW 0.95-0.98 mm; tergite IV about twice as long as tergite V; sternite IX as in Figure 2I. Length of aedeagus (Figure 2 J–L) 0.49 mm; median lobe asymmetric, narrowing apically; elongate parameres moderately broadened dorso-ventrally, narrowed at apex.

Female. Similar to male in general morphology; eyes each composed of about 24 facets; antennae and legs simple; lacking metaventral processes. Measurements: BL 2.47-2.69 mm, HL 0.57-0.60 mm, HW 0.50-0.51 mm, PL 0.53-0.55 mm, PW 0.52-0.55 mm, EL 0.48-0.59 mm, EW 0.92-0.99 mm, AL 0.89-0.95 mm, AW 0.95-0.99 mm.

Distribution.

China: Hubei (Figure 11A).

Etymology.

The new specific epithet refers to the strongly arched mesotibiae.

Comparative notes.

The new species is placed as a member of the L. cardialis -group based on the modified male antennomere IX. Linan arcitibialis is the only member of the group that exhibits a simple antennomere X. Combined with the unique form of antennomere IX and strongly arched mesotibia, males of this species can be readily separated from all other congeners at a quick glance.