Horniella taiwanensis Zhang, Hu & Yin, 2021

Zhang, Wen-Xuan, Hu, Fang-Shuo & Yin, Zi-Wei, 2021, Six new species of Horniella Raffray from the Oriental region (Coleoptera, Staphylinidae, Pselaphinae), ZooKeys 1042, pp. 1-22 : 1

Horniella taiwanensis Zhang, Hu & Yin sp. nov. Figures 7B , 9

Type material.

Holotype: China: ♂, 'TAIWAN: Taoyuan City, Northern Cross-island Highway 35.7 k (北横公路35.7 k), Fusing Township, 15-IV-2018, leg. K. X. Zhan’ (NMNS). Paratypes: China: 1 ♂, 'TAIWAN: Nantou County, Sun Moon Lake (日月潭), Yuchih Township, 13-XII-2016, leg. F. C. Hsu’ (NMNS); 1 ♂, 'TAIWAN: Taichung City, Dakeng (大坑), Xinshe Dist., 24.1932, 120.7991, 10-IV-2021, leg. C. T. Hsu (under rock)' (NMNS); 1 ♂, 'Kuantaoshan, NANTOU, TAIWAN, 南投县关刀山, 16.vii.1999, M. Tanikado leg.' (MHNG); 1 ♂, 'Tehuashe (800 m), NANTOU, TAIWAN, 南投县德化社, 2.vii.2000, H. Y. Chu leg. (at light) (MHNG); 1 ♂, 'Taiwan, Nantou, Meifeng (梅峰), 2100 m, 6.v.01 (sifting of litter), Sugaya lgt.' (SNUC).

Diagnosis.

Male. Head longer than wide, with distinct anterolateral genal projections, anterior margin of projection narrowly emarginate, with long ocular canthus; scape roundly expanded at basolateral margin, antennomeres 9-11 slightly enlarged. Pronotum rounded at anterolateral margins. Protrochanter, profemur and mesotrochanter each with ventral spine; protibia and mesotibia with large apical projection. Tergite 1 (IV) with median carina extending posteriorly for approximately 1/4 of tergal length, lacking discal carinae. Aedeagus with asymmetric median lobe, right half of median lobe greatly protruding apicad, apical margin nearly rounded in dorsal view.

Description.

Male. Body reddish-brown, length 4.05-4.15 mm. Head (Fig. 9A ) slightly longer than wide, HL 0.84-0.87 mm, HW 0.74-0.76 mm; anterolateral genal projection distinct, anterior margin of projection narrowly emarginate; antenna 2.1 mm long, scape roundly expanded at basolateral margin, antennomeres 2-8 slightly elongate or moniliform, club loosely formed by apical three moderately enlarged antennomeres, antennomere 11 largest, slightly shorter than antennomeres 9 and 10 combined; indistinct lateral postantennal pits present; eyes prominent, each composed of approximately 40 large facets, with long ocular canthus (Fig. 9B ).

Pronotum slightly longer than wide, PL 0.78-0.82 mm, PW 0.76-0.77 mm; widest at apical 1/3; anterolateral margins rounded; disc moderately convex, finely punctate, with distinct median antebasal and lateral antebasal foveae connected by complete transverse antebasal sulcus.

Elytra much wider than long, EL 0.94-1.01 mm; EW 1.51 mm; each elytron with two large, setose basal foveae; discal striae extending from outer basal foveae to apical 2/3 of elytral length.

Legs elongate; protrochanter (Fig. 9C ) with short, acute ventral spine, profemur (Fig. 9C ) with distinctly long ventral spine near base; protibia (Fig. 9D ) with large apical projection; mesotrochanter (Fig. 9E ) with sharp ventral spine, mesofemur (Fig. 9E ) simple, mesotibia (Fig. 9F ) with moderately large projection.

Abdomen approximately as long as broad, broadest at lateral margins of tergite 1 (IV), AL 1.45-1.49 mm, AW 1.47-1.49 mm; tergite 1 (IV) slightly longer than tergites 2 (V), with short median carina extending to near basal 1/4 of tergal length, lacking discal carinae, tergite 2 (V) lacking carina, tergites 2-4 (V-VII) each with small basolateral foveae. Sternite 2 (IV) with broad basal sulcus, lacking mediobasal foveae, basolateral foveae developed as large cuticular pockets, with two pairs of antebasal nodules, sternites 3-5 (V-VII) with basolateral foveae, one median and two lateral nodules, sternite 7 (IX) with well-sclerotized apical half and less sclerotized basal half.

Aedeagus (Fig. 9G-I ) 1.01 mm long, with strongly asymmetric median lobe, right half of median lobe greatly protruding apicad, apex broadened, with round apical margin dorso-ventral view; endophallus composed of one elongate, and two much shorter sclerites.

Female. Unknown.

Comparative notes.

This species is placed as a member of the H. centralis group and is most similar to H. sichuanica Yin & Li in the shapes of the anterolateral genal projections and spination of the legs. They can be clearly separated by the larger body size (4.05-4.15 mm vs 3.58-3.77 mm), the more distinct apical projections of protibia and mesotibia, and the dilated apex of the aedeagal median lobe of the new species.

Distribution.

China: Taiwan.

Etymology.

The new specific is named after Taiwan.

List of Horniella species worldwide

H. aculeata Yin & Li, 2015: 110. China: Yunnan; Thailand: Nan, Mae Hong Son.

H. asymmetrica Yin & Li, 2014: 42. Thailand: Prachin Buri, Chanthaburi.

H. awana Yin & Li, 2014: 65. West Malaysia: Pahang.

H. bifurca Zhang, & Yin, sp. nov. Thailand: Chiang Mai.

H. burckhardti Yin & Li, 2014: 45. Thailand: Chiang Mai.

H. centralis Yin & Li, 2014: 11. China: Shaanxi.

H. cibodas Yin & Li, 2014: 74. Indonesia: West Java.

H. confragosa Yin & Li, 2014: 14. China: Guangxi, Guizhou.

H. dao Yin & Li, 2014: 17. China: Sichuan.

H. falcis Yin & Li, 2014: 18. China: Guizhou.

H. gigas Yin & Li, 2014: 66. East Malaysia: Sabah.

H. haucki Zhang, & Yin, sp. nov. Thailand: Mae Hong Son.

H. himalayica Yin & Li, 2014: 35. Nepal: Bāgmatī añcal; India: Uttarakhand.

H. hirtella (Raffray, 1901: 30). Sri Lanka: Northern, North Central, Central, Uva.

H. hongkongensis Yin & Li, 2014: 21. China: Hong Kong.

H. intricata Yin & Li, 2014: 47. Thailand: Mae Hong Son, Chiang Mai.

H. jinggangshana Yin & Li, 2015: 113. China: Jiangxi.

H. kaengkrachan Yin & Li, 2014: 50. Thailand: Phetchaburi.

H. khaosabap Yin & Li, 2014: 51. Thailand: Chanthaburi.

H. khasiensis Zhang, & Yin, sp. nov. India: Meghalaya.

H. loebli Yin & Li, 2014: 54. Thailand: Chiang Mai.

H. nakhi Yin & Li, 2014: 25. China: Yunnan.

H. nantouensis Zhang, Hu & Yin, sp. nov. China: Taiwan.

H. philippina Yin & Li, 2014: 63. Philippines: Laguna.

H. phuphaman Yin & Li, 2014: 56. Thailand: Khon Kaen.

H. pilosa Yin & Li, 2014: 69. East Malaysia: Sabah.

H. prolixo Yin & Li, 2014: 60. Thailand: Chiang Mai.

H. sabahensis Zhang, & Yin, sp. nov. East Malaysia: Sabah.

H. schuelkei Yin & Li, 2014: 25. China: Yunnan.

H. schwendingeri Yin & Li, 2014: 60. Thailand: Chiang Mai.

H. sichuanica Yin & Li, 2014: 28. China: Sichuan.

H. simplaria Yin & Li, 2014: 28. China: Guangxi.

H. smetanai Yin & Li, 2014: 72. East Malaysia: Sabah.

H. taiwanensis Zhang, Hu & Yin, sp. nov. China: Taiwan.

H. tianmuensis Yin & Li, 2014: 32. China: Zhejiang.

Figures

Figure 7. Dorsal habitus of Horniella species A H. sabahensis sp. nov. B H. taiwanensis sp. nov. Scale bars: 1 mm.

Figure 9. Diagnostic characters of Horniella taiwanensis sp. nov. A left half of head, in dorsal view B head, in lateral view C protrochanter and profemur D protibia E mesotrochanter and mesofemur F mesotibia G-I aedeagus, in dorsal (G), lateral (H), and ventral (I) view. Scale bars: 0.2 mm (A, B, G-I); 0.3 mm (C-F).