Megalinus ningxiaensis Bordoni, 2013

ZHOU, YU-LINGZI, BORDONI, ARNALDO & ZHOU, HONG-ZHANG, 2013, Taxonomy of the genus Megalinus Mulsant & Rey (Coleoptera: Staphylinidae, Xantholinini) and seven new species from China, Zootaxa 3727 (1), pp. 1-66 : 17-19

Megalinus ningxiaensis Bordoni , sp. nov.

( Fig. 2B ; Fig. 4A–E )

Type materials. Holotype: male, CHINA: Ningxia: Longde Co.: Sutai Forestry, 2200 m, 22.VI.2008, Yin Ziwei collected (CT); paratypes: one male, Qinghai: Road 301, km 140, 63 km ESE Men Yuan (E 102.2678, N 37.1281), 2558 m, 5.VII.2011, D.W.Wrase collected ( CS); one female, Laji Shan, 23 km S Ledu (E 102.3675, N 36.2920), 2726 m, 13.VII.2011, D. W. Wrase collected ( CS); one male, one female, datas as above ( CB).

Description

Measurements. BL= 8.8 mm, FL= 5.5 mm, HL= 1.6 mm, HW= 1.5 mm, PL= 1.9 mm, PW= 1.3 mm, EL= 1.8 mm, EW= 1.7 mm.

Body cylindrical, large sized. Body dark brown, head and pronotum darker, apical 1/3 of last antennomere yellowish brown.

Head ( Fig. 2B ). Subquadrate (HL to HW ratio 1.1), temple obviously widened posteriorly, posterior angles rounded. Dorsal integument shiny, without microsculpture, but with extensive micropunctures, also distributed with round, medium-sized punctures, interspaces between punctures 1–2 punctures’ diameter, except impunctate medial longitudinal band (width ca. 0.20 mm). Each side of cranium also with frontal puncture on epistoma, anterolateral puncture near antennal insertion, midlateral puncture approximately a distance of 6–7 punctures’ diameter from dorsal margin of eye, temporal puncture near lateral margin, and occipital puncture near posterior margin; deflexed portion of head bearing 2–3 rows of small punctures. Frontal furrows convergent, deeper than anteocular furrows, but of same length; anteocular furrows long, arriving line connecting rearmost of each eye. Eye of medium size, slightly longer than 1/3 of temporal length (eye: temple = 0.35: 0.99 mm), slightly protruding laterad. Epistoma protruding forwards, of subrectangular shape, anterior margin subtruncated. Distance between antennal insertions 0.39 mm, equal to that from antenna to eye (0.37 mm).

Antennae. Scape stout, thickened apically, longer than three subsequent antennomeres combined, 0.76 mm; antennomere II and III elongate, both 0.16 mm; IV and V transverse, subequal in length, 0.10 mm; last antennomere of short length, 0.21 mm, shorter than length of preceding two antennomeres combined.

Neck. Relatively wide (0.58 mm), wider than 1/3 of head width.

Pronotum ( Fig. 2B ). Subrectangular, distinctly elongated (PL to PW ratio 1.4), distinctly longer than head, but slightly narrower. Obviously widened anteriad, lateral margins convergent backwards, anterior angles protruding 12 punctures; lateral row, curvedly arranged, of 12–13 punctures; other irregular punctures scattered near anterior margin.

Mesoscutellum. Shiny, extensively covered with isodiametric mesh, and with paired punctures on anterior 1/3.

Elytra ( Fig. 2B ). Subquadrated (EL to EW ratio 1.1), obviously wider than pronotum, but of same length. Humeri well developed, lateral margins widened posteriorly, hind margin subtruncated. Integument shiny and flattened, without microsculpture; each elytron with 8–9 rows of medium-sized punctures; deflexed portion with 5– 6 rows of smaller punctures.

Abdomen. Cylindrical, broadest at segment VI. Tergites III–VII shiny, covered with superficial transverse microstriae and small setiferous punctures, interspaces between punctures near 1–2 punctures’ diameter, denser laterobasally; each tergite with basal impression, which impunctate, but bearing distinct polygonal reticulum. Surface between two basal transverse carinae sparsely punctate, but bearing distinct polygonal reticulum. All abdominal sternites shiny, with microsculpture and setiferous punctures as those on tergites.

Male. Abdominal segment VIII entirely covered with setiferous punctures, except a narrow medial longitudinal impunctate band; posterior margins of tergite VIII medially emarginated ( Fig. 4A ), that of sternite VIII subtruncated ( Fig. 4B ). Tergite IX symmetrical, connected mediobasally. Sternite IX asymmetrical, with sharp base and broadly arcuate posterior margin ( Fig. 4C ). Tergite X symmetrical, with slightly rounded base and slightly emarginated posterior margin, in situ broadly exposed between tergite IX ( Fig. 4D ). Median lobe of aedeagus oblong, large sized ( Fig. 4E ), basal piece without transparent, membranous medial-longitudinal band, anterior portion subcylindrical, 0.27 mm; basal bulb 1.16 mm long. Parameres symmetrical, elongate, distinctly longer than 1/3 of basal bulb. Internal sac of L-shaped with medium-sized spines.

Etymology. The specific epithet is named after the Chinese name (Pin-Yin) of the name of type locality.

Remarks. This species could be distinguished from its congeners by: 1) neck relatively wide; 2) admedian row of pronotum consisting of 11–12 punctures and lateral row, curvedly arranged, of 12–13 punctures; 3) mesoscutellum extensively covered with isodiametric mesh; 4) median lobe of aedeagus rather oblong; 5) internal sac L-shaped and with medium-sized spines.

Figures

FIGURE 2. Forebody: A. Megalinus hailuogouensis sp. nov.; B. M. ningxiaensis sp. nov.; C. M. tangi sp. nov. Scale bars 0.30 mm.

FIGURE 4. Megalinus ningxiaensis sp. nov.: A. male tergite VIII; B. male sternite VIII; C. male sternite IX; D. male tergite X; E. median lobe of aedeagus, dorsal view. Scale bars 0.30 mm.