Linan megalobus 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 : 132-133

Linan megalobus Yin & Li sp. nov.

( Figs. 5 , 11 , 16, 21 , 26 , 35–36, 41–42 , 47 )

Type locality. China, Guizhou Province, Kuankuoshui Nature Reserve.

Type material (10 JJ 9 ♀♀). HOLOTYPE: J, ‘ CHINA: GUIZHOU Prov. / Zunyi, Suiyang Count. / Kuankuoshui N. R. Guizhou Prov. / Zunyi , Suiyang Count. / Kuankuoshui N. R., Houshan / alt. 1,500 m, 13.viii.2010 / Ting FENG leg.’ ( SNUC) . PARATYPES: 2 JJ, ‘ CHINA: GUIZHOU Prov. / Zunyi City, Suiyang Count. / Kuankuoshui N. R. Houshan / Zi-Wei YIN leg .’; 3 JJ, 8 ♀♀, ‘ CHINA: GUIZHOU Prov. / Zunyi, Suiyang Count. / Kuankuoshui N. R. / alt. 1,400 m, 13.viii.2010 / FENG & YIN leg .’; 4 JJ 1 ♀, ‘ CHINA: GUIZHOU Prov. / Zunyi, Suiyang Count. / Kuankuoshui N. R. / Gongtonggou / alt. 1,550 m, 07–09.vi.2010 / YIN & ZHAI leg.’ (all SNUC) .

Diagnosis. Medium in size, 2.44–2.54 mm. Antennal club three-segmented, antennomeres IX–X strongly modified in male. Metaventral horn-like processes long. Legs without spine; protibiae in male expanded mesally at apex, normal in female.

Description. Male ( Fig. 5 ). Length 2.44–2.54 mm. Head longer than wide, HL 0.58–0.59 mm, HW 0.49–0.50 mm; eyes prominent, each composed of about 30 facets. Antenna with scape elongate, about 3.4 times as long as wide, segments II–IV and VIII similar, each about as long as wide, V–VII each slightly longer than wide, IX–XI clubbed ( Fig. 11 ), IX–X strongly modified.

Pronotum ( Fig. 16 ) about as long as wide, PL 0.53–0.55 mm, PW 0.54–0.55 mm. Elytra together wider than long, EL 0.64–0.66 mm, EW 0.87–0.88 mm. Metaventral horn-like processes ( Fig. 21 ) very long, slightly curved in lateral view. Legs without spine; protibia expanded mesally at apex, forming bluntly rounded spur ( Fig. 26 ).

Abdomen large, AL 0.69–0.74 mm, AW 0.89–0.91 mm; first visible tergite (morphologically tergite IV) about twice as long as the second; discal carinae very indistinct; sternite IX as in Fig. 41 . Aedeagus 0.49 mm long, structure as in Figs. 35–36 .

Female. Similar to male in size; BL 2.45–2.54 mm, HL 0.58–0.60 mm, HW 0.50–0.52 mm, PL 0.53–0.54 mm, PW 0.54–0.56 mm, EL 0.62–0.66 mm, EW 0.88–0.98 mm, AL 0.72–0.74 mm, AW 1.03–1.05 mm. Eyes each composed of about 20 facets. Antennal club modified. Protibia cylindrical, not expanded mesally at apex.

Distribution and habitat. The new species is known only from Kuankuoshui Nature Reserve, Guizhou Province (South China). Specimens were sifted from leaf litter along a road ( Fig. 47 ).

Etymology. The specific name, a noun in aposition, refers to the large parameres of the aedeagus (mega = very large, lobus = lobe).

Remarks. The new species belongs to L. cardinalis species-group based on the modified antennal club and protibiae in male. It may be distinguished from L. cardialis and L. hainanicus by the shape of antennomeres IX–XI, and by the form of the metaventral horn-like processes in male and the aedeagus.

Figures

Figs. 5–6. Dorsal habitus of Linan spp. 5 – L. megalobus sp. nov., male; 6 – L. sp. indet., female.

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.).