Linan cardialis 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 : 126-127

Linan cardialis Hlaváč, 2002

( Figs. 1 , 7 , 12, 17 , 22–24 , 27–28, 37 , 42–43 )

Linan cardialis Hlaváč, 2002: 294 ; HLAVÁČ & CHANDLER (2005: 110).

Type locality. Northwestern Thailand, Wiang Pa Pao, Ban Huay Ya Sai.

Material studied (1 J 1♀). 1J, ‘ CHINA: YUNNAN Prov. / Nabanhe N. R./ Shanshenmiao / alt. 1,700 m, 27.iv.2009 / Jiao-Yao HU & Zi-Wei YIN leg.’ ( SNUC) ; 1 ♀, ‘ CHINA: YUNNAN Prov. / Xishuangbanna N. R. / Wangtianshu / Taoxixiaodao / alt. 600–700 m, 11.vii.2009 / Lie NING leg.’ ( SNUC) .

Diagnosis. Large in size, 3.3–3.6 mm. Antenna with three-segmented club, segments IX–X strongly modified in male. Metaventral horn-like processes large, bifurcate at apex. Pro- and mesotrochanter each with small but distinct spine on posterior margin; protibia expanded as rounded lobe at apex in male, unmodified in female.

Redescription. Male ( Fig. 1 ). Length 3.63 mm (2.7–2.9 mm in HLAVÁČ 2002, wrong measurement, HLAVÁČ pers. comm.). Head slightly longer than wide, HL 0.79 mm, HW 0.73 mm; eyes prominent, each composed of about 50 facets. Antenna with scape elongate, about 4.6 times as long as wide, pedicel about as long as wide, antennomeres III–VII each longer than wide, VIII similar to pedicel, antennal club as in ( Fig. 7 ), ventral side of segment IX with finely punctate sensory area nearly triangular, extended from basal sixth toward anterior margin.

Pronotum ( Fig. 12 ) about as long as wide, PL 0.78 mm, PW 0.76 mm. EL 0.96 mm, EW 1.25 mm. Metaventral horn-like processes elongate and bifurcate at apex in lateral view ( Fig. 17 ). Pro- ( Fig. 22 ) and mesotrochanter ( Fig. 23 ) with one spine on posterior margin; protibia expanded mesally at apex, forming broadly rounded lobe ( Fig. 24 ).

Abdomen large, AL 1.08 mm, AW 1.30 mm; first visible tergite (morphologically tergite IV) about four times as long as the second; discal carinae well-defined, reaching basal fourth of tergite length; sternite IX as in Fig. 37 . Aedeagus 0.53 mm long, structure as in Figs. 27–28 .

Female. Similar to male in size; BL 3.28 mm, HL 0.76 mm, HW 0.69 mm, PL 0.77 mm, PW 0.73 mm, EL 0.91 mm, EW 1.29 mm, AL 0.84 mm, AW 1.35 mm. Eyes each composed of about 35 facets. Antenna slightly clubbed and not modified. Apex of protibia cylindrical, not expanded mesally.

Distribution and habitat. The range of this species extends from northwestern Thailand (Wiang Pa Pao) to Southwest China (Yunnan Province). Specimens were sifted from decayed leaf litter on the forest floor of a broad-leaved forest ( Fig. 43 ).

Remarks. This species belongs to the L. cardialis species-group based on the modified antennal club in the male. It is closely allied to L. hainanicus , but may be distinguished by the larger size, the shape of the antennal club, and the presence of spines on the pro- and mesotrochanters.

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.).