Linan inornatus Yin & Li, 2011

Yin, Zi-Wei, Li, Li-Zhen & Zhao, Mei-Jun, 2011, A review of the genus Linan (Coleoptera: Staphylinidae: Pselaphinae), Acta Entomologica Musei Nationalis Pragae 51 (1), pp. 123-135 : 130-132

Linan inornatus Yin & Li sp. nov.

( Figs. 4 , 10 , 15, 20 , 33–34, 40 , 42 , 46 )

Type locality. China, Anhui Province, Tianzhushan Mountain.

Type material (7 JJ 3 ♀♀). HOLOTYPE: J, ‘ CHINA: ANHUI Prov. / Tianzhushan Mt. / alt. 960 m, 23.iv.2005 / HU & TANG leg .’. PARATYPES: 3 JJ 2 ♀♀, same label data as the holotype ; 1 J, same label data as the holotype, but ‘alt. 1,150–1250 m, 25.iv.2005 ’; 2 JJ 1 ♀, same label data as the holotype, but ‘ 18–20.v.2007, alt. unknown’ (all SNUC) .

Diagnosis. Medium in size, 2.63–2.68 mm. Antennal club slightly defined and not modified in male. Metaventral horn-like processes long. Legs simple without spine; protibiae cylindrical at apex, not expanded mesally in both sexes.

Description. Male ( Fig. 4 ). Length 2.63–2.68 mm. Head slightly longer than wide, HL 0.59–0.60 mm, HW 0.52–0.54 mm; eyes small, each composed of about 20 facets. Antennal scape elongate, about 4.5 times as long as wide, pedicel slightly longer than wide, III–VII each longer than wide, VIII similar to pedicel, antennal club as in Fig. 10 .

Pronotum ( Fig. 15 ) about as long as wide, PL 0.57–0.59 mm, PW 0.55–0.59 mm. Elytra together wider than long, EL 0.71–0.72 mm, EW 0.95–1.01 mm. Metaventral horn-like processes ( Fig. 20 ) long, truncated at apex in lateral view. Legs simple in structure, without spine.

Abdomen large, AL 0.76–0.77 mm, AW 0.98–1.06 mm; first visible tergite (morphological tergite IV) about twice as long as the second; discal carinae well-defined but very short, reaching basal sixth of tergite length; sternite IX as in Fig. 40 . Aedeagus 0.47 mm long, structure as in Figs. 33–34 .

Female. Similar to male in size; BL 2.50–2.83 mm, HL 0.60–0.64 mm, HW 0.52–0.54 mm, PL 0.55–0.60 mm, PW 0.59–0.63 mm, EL 0.67–0.68 mm, EW 0.97–1.02 mm, AL 0.68–0.91 mm, AW 1.03–1.12 mm. Eyes each composed of about 20 facets. Antennal club not modified.

Distribution and habitat. The new species is known only from Tianzhushan Mountain, Anhui Province (East China). Specimens were found in leaf litter on the forest floor of a coniferous and broad-leaf forest ( Fig. 46 ).

Etymology. The Latin adjective inornatus means ‘unadorned’, referring to the absence of antennal modifications of the male.

Remarks. The new species belongs to L. chinensis species-group by the absence of modified antennae. It is very similar to L. chinensis in general appearance, but may be separated by the relatively narrower elytra and abdomen in contrast to the pronotum (see Remarks under L. chinensis ), the larger metaventral processes, and the shape of the aedeagus.

Figures

Figs. 1–4. Male habitus of Linan spp. 1 – L. cardialis Hlaváč, 2002; 2 – L. chinensis (Löbl, 1964); 3 – L. hainanicus Hlaváč, 2002; 4 – L. inornatus sp. nov.

Figs. 7–11.Antennal segments VIII–XI of Linan spp. in male. 7 – L. cardialis Hlaváč, 2002; 8 – L. chinensis (Löbl, 1964); 9 – L. hainanicus Hlaváč, 2002; 10 – L. inornatus sp. nov.; 11 – L. megalobus sp. nov. Scales: 0.3 mm.

Figs. 12–21. Pronotum and metaventral horn-like processes of Linan spp. in male. 12, 17 – L. cardialis Hlaváč, 2002; 13, 18 – L. chinensis (Löbl, 1964); 14, 19 – L. hainanicus Hlaváč, 2002; 15, 20 – L. inornatus sp. nov.; 16, 21 – L. megalobus sp. nov. Scales: 0.2 mm.

Figs. 27–41. Aedeagus and sternite IX of Linan spp. 27, 29, 31, 33, 35 – aedeagus, in dorsal view; 28, 30, 32, 34, 36 – aedeagus, in lateral view; 37–41 – sternite IX of Linan spp. 27, 28, 37 – L. cardialis Hlaváč, 2002; 29–30, 38 – L. chinensis (Löbl, 1964); 31–32, 39 – L. hainanicus Hlaváč, 2002; 33–34, 40 – L. inornatus sp. nov.; 35–36, 41 – L. megalobus sp. nov. Scales: 0.2 mm (a, b, c, d, e); 0.1 mm (f, g, h, i, j).

Fig. 42. Distribution of the genus Linan Hlaváč, 2002. Black squares – L. cardialis Hlaváč, 2002; white triangle – L. chinensis (Löbl, 1964); white squares – L. hainanicus Hlaváč, 2002; white circle – L. inornatus sp. nov.; black circle – L. megalobus sp. nov.; black triangle – L. sp. indet.

Figs. 43–48. Habitats of the genus Linan Hlaváč, 2002. 43 – Nabanhe Nature Reserve, Yunnan (L. cardialis Hlaváč, 2002); 44 – Longwangshan Mountain, Zhejiang (L. chinensis (Löbl, 1964)); 45 – Bawangling Nature Reserve, Hainan (L. hainanicus Hlaváč, 2002); 46 – Tianzhushan Mountain, Anhui (L. inornatus sp. nov.); 47 – Kuankuoshui N. R., Guizhou (L. megalobus sp. nov.); 48 – Sanqingshan Mountain, Jiangxi (L. sp. indet.).