Medhiama liupanshanensis Zhou & Zhou

Zhou, Yu-Lingzi & Zhou, Hong-Zhang, 2012, Taxonomy of the genus Medhiama Bordoni, 2002 (Coleoptera: Staphylinidae, Staphylininae, Xantholinini) with descriptions of three new species, Zootaxa 3478, pp. 169-191 : 175-178

2. Medhiama liupanshanensis Zhou & Zhou , sp. n.

( Fig. 4 A–H)

Type material. Holotype: male, CHINA: Ningxia: JingYuan co.: Liupan Shan: Shanpo Linchang, 2200 m, 06.VII.2008, Zhou Haisheng & Zhao Zongyi collected (IZ-CAS); Paratypes: 1 female, same data as holotype; Xixia Linchang, 1 male, 2100 m, 26.VI.2008, Zhou Haisheng & Zhao Zongyi collected; Erlonghe Linchang, 1 female, 2050 m, 22.VI.2008, Zhou Haisheng & Zhao Zongyi collected (IZ-CAS).

Description. Measurement. BL= 5.89 mm, FL= 3.23 mm, HL = 1.08 mm, HW= 0.80 mm, PL= 1.10 mm, PW= 0.70 mm, EL= 0.95 mm, EW= 0.95 mm.

Body nearly cylindrical and medium sized. Entirely brown, except legs, apical 1/2 of last antennomere, last segment of maxillary and labial palpi lighter in color.

Head. Oblong (HL to HW ratio 1.36), tempora substraight, not widened, posterior angles rounded. Dorsal integument entirely bearing microsculpture composed of shallow polygonal reticulum, and extensively distributed relatively small punctures, puncture intervals not wide, being equal about puncture diameter. Median longitudinal region impunctate, width equals to 4–5 puncture diameters; frontal region with shallow microstriae, and 3 pairs of tiny punctures. Each side of cranium without anterolateral puncture, with midlateral puncture far from dorsal margin of eye (5–6 puncture diameters to eye), temporal puncture rather near lateral margin (at lateral 1/6) and occipital puncture rather near posterior margin (at posterior 1/6). Frontal furrows deep and long, convergent backwards; anteocular furrows indistinct, scarcely observable. Eye quite small and rather flat, diameter not over 1/5 of temporal length (eye: tempora = 0.13: 0.82 mm). Epistoma relatively wide, subrectangular and flat, with a pair of tiny punctures. Distance between antennal insertions 0.24 mm, longer than distance from antenna to eye (0.19 mm).

Antennae. Scape stout, thickened apically, much longer than three subsequent antennomeres combined, 0.44 mm; antennomere II elongate, 0.11 mm; III elongate, slightly shorter than II, 0.10 mm; IV and V subequal in length, 0.080 mm; last antennomere of medium length, 0.19 mm, subequal to two preceding antennomeres combined.

Mouthparts. Labrum bilobed, with a median longitudinal groove. Maxillary palpus elongate, segment III longest, last segment slender and obconical and shorter than the penultimate. Labial palpus distinctly slender, last segment longest.

Neck. Medium width (0.29 mm), nearly 1/3 of head width, with a transverse substraight ridge on anterior 1/3.

Pronotum. Relatively shorter (PL to PW ratio 1.57), of same length as head, but narrower. Widest at anterior 1/3, narrowest at posterior 1/3. Anterior angles widely rounded and slightly protruding, lateral margins sinuate from middle, posterior angles rounded. Integument bearing shallow microstriae, and a pair of admedian row of 12–14 punctures, smaller than those on head. Areas outside admedian rows with additional, irregular, sparsely set punctures.

Mesoscutellum. Shiny, extensively bearing polygonal reticulum and with a pair of small punctures on apical 1/4.

Elytra. Subquadrate (EL to EW ratio 1.0), shorter but distinctly wider than pronotum. Humeri well developed, lateral margins widened posteriorly, hind margin rounded. Integument slightly wrinkled, without microsculpture; each side symmetrically with regular rows of punctures, interspaces between rows 1–2 puncture diameters; deflexed portion of each elytron with 3–4 rows of punctures.

Legs. First four segments of protarsi stout, not dilated, those of mesotarsi relatively slender; each last segment as long as the II–IV combined. Protibia with apical ctenidium and subapical ctenidia, meso- and metatibia only with apical ctenidium.

Abdomen. Cylindrical, broadest at segment VII. Tergites III–VII shiny, surface entirely covered with a distinct mixture of extensive microstriae and polygonal reticulum; punctures small, sparsely scattered, interspace between them 3–4 puncture diameters, but much denser on tergite VI and VII. Each tergite with median longitudinal impunctate region, width about 3–4 puncture diameters, without distinct basal impression near anterior margin. Surface between two basal transverse carinae of tergites III–VII bearing distinct polygonal reticulum. All abdominal sternites shiny, with microstriae and setiferous punctures as those on tergites.

Male ( Fig. 4 A–F). Abdominal segment VIII entirely covered with setiferous punctures, posterior margins of tergite VIII and sternite VIII both slightly emarginated ( Fig.4 A, B). Tergite IX symmetrical, connected mediobasally. Sternite IX, with long linear-shaped base and rounded in right margin ( Fig.4 D). Tergite X symmetrical and broadest at anterior 1/4, anterior 1/4 sharply narrowed and with obtusely rounded apex ( Fig.4 C). Aedeagus elliptical and large ( Fig. 4 E, F), basal bulb 1.16 mm long. Parameres symmetrical and simple, 0.34 mm and slightly shorter than 1/3 of basal bulb length. Internal sac broadly bag-like, gradually widened and with cellshaped structure in median portion ( Fig. 4 E).

Female ( Fig. 4 G, H). Sternite VIII not distinctly oblong, and posterior margin sharply protruding posteriorly ( Fig. 4 G). Genital segment with a large pair of subtriangular supplementary sclerites, and a broad sternite with not distinctly protruding anterior margin ( Fig. 4 H).

Distribution. China (Ningxia).

Etymology. The specific epithet is the Latinized adjective derived from the Chinese name (Pin-yin) of the type locality: Liupan Shan.

Remarks. This new species can be easily distinguished from its congeners by the following character combination: sparsely punctate head, emarginated posterior margin of male sternite VIII, special form of sternite IX, tergite X, unique shape of inner sac and a broad sternite with slightly protruding anterior margin in female genital segment.

Figures

FIGURE 4. Medhiama liupanshanensis sp. n.: A. male tergite VIII; B. male sternite VIII; C. male tergite X; D. male sternite IX; E. aedeagus, dorsal view; F. aedeagus, ventral view; G. female sternite VIII; H. female genital segment. Scale bars 0.15 mm.