Linan hainanicus Hlaváč, 2002

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 : 129-130

Linan hainanicus Hlaváč, 2002

( Figs. 3 , 9 , 14, 19 , 25 , 31–32, 39 , 42 , 45 )

Linan hainanicus Hlaváč, 2002: 295 . HLAVÁČ & CHANDLER (2005: 110).

Type locality. China, Hainan Dao Island, Jian Feng Ling Nature Reserve.

Material studied (5 JJ). 2 JJ, ‘ CHINA: HAINAN Prov. / Ledong Count. / Jianfengling N. R. / alt. 1, 000 m, 15.iv.2010 / Ting FENG leg .’; 1 J, ‘ CHINA: HAINAN Prov. / Ledong Count. / Jianfengling N. R. / alt. 500 m, 14.iv.2010 / Bao-Ping HUANG leg .’; 2 JJ, ‘ CHINA: HAINAN Prov. / Changjiang Count. / Bawangling N. R. / alt. 1,000 m, 11.iv.2010 / Zi-Wei YIN leg.’ (all SNUC) .

Diagnosis. Medium in size, 2.95 mm, antennomeres IX–X strongly modified in male. Metaventral horn-like processes large. Legs simple without spine; protibiae protuberant mesally at apex in male, cylindrical in female.

Redescription. Male ( Fig. 3 ). Length 2.95 mm (2.4–2.7 mm in HLAVÁČ (2002) based on wrong measurement, Hlaváč, pers. comm.). Head slightly longer than wide, HL 0.68 mm, HW 0.63 mm; eyes prominent, each composed of about 50 facets. Antenna with elongate scape, about five times as long as wide, antennomeres II–III and VII each slightly longer than wide, IV–VI similar, elongate, VIII transverse, wider than long, antennal club as in Fig. 9 , ventral side of segment IX with finely punctate sensory area linear, extended from middle toward posterior margin.

Pronotum ( Fig. 14 ) about as long as wide, PL 0.62 mm, PW 0.62 mm. EL 0.87 mm, EW 1.13 mm. Metaventral horn-like processes as in Fig. 19 , bifurcate at apex in lateral view. Protibia ( Fig. 25 ) protuberant mesally, forming broadly truncate spur at apex.

Abdomen large, AL 0.78 mm, AW 1.08 mm; first visible tergite (morphologically tergite IV) about twice as long as the second; discal carinae short, reaching basal sixth of tergite length; sternite IX as in Fig. 39 . Aedeagus 0.60 mm long, structure as in Figs. 31–32 .

Female. Unknown.

Distribution and habitat. This species is endemic to western Hainan Island (South China). Specimens were sifted from the leaf litter along a small stream ( Fig. 45 ).

Remarks. This species belongs to L. cardialis species-group based on the strong modification of the antennal club in the male. It is most closely allied to L. cardialis , but may be distinguished by the smaller size (2.95 mm of this species, 3.3–3.6 mm of cardialis ), the shape of the antennal club and the shape of metaventral processes, the legs simple without spines, 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. 22–26. Details of legs of Linan spp. in male. 22 – protrochanter and profemur of L. cardialis Hlaváč, 2002; 23 – mesotrochanter and mesofemur of L. cardialis; 24 – protibia of L. cardialis; 25 – protibia of L. hainanicus Hlaváč, 2002; 26 – protibia of L. megalobus sp. nov. Scales: 0.3 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.).