Megalinus ailaoshanensis Zhou & Zhou

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 : 8-11

Megalinus ailaoshanensis Zhou & Zhou , sp. nov.

(Fig. 1A–H; Fig. 1-1A–G)

Type material. Holotype: male, CHINA: Yunnan: Jingdong co.: Ailaoshan Field Station (E 101.0003, N 24.0055), 2500 m, 17.IX.2010, Zhou Yulingzi collected ( IZ-CAS).

Description

Measurements. BL= 8.6 mm, FL= 4.4 mm, HL= 1.2 mm, HW= 1.1 mm, PL= 1.5 mm, PW=1.0 mm, EL= 1.5 mm, EW= 1.3 mm.

Body cylindrical, medium sized and entirely dark brown (Fig. 1D).

Head (Fig. 1A). Subrectangular (HL to HW ratio 1.1), temple rounded, not distinctly expanded, broadest at middle, posterior angles rounded. Dorsal integument shiny, without microsculpture, but extensively with micropunctures, also sparsely distributed with round, medium-sized punctures, interspaces between punctures over two punctures’ diameter; additionally with some smaller punctures on surface between anteocular furrows; disc sparsely punctate. Each side of cranium also with frontal puncture on epistoma, anterolateral puncture near antennal insertion, three puncture on frontal region, midlateral puncture approximately a distance of 5–6 punctures’ diameter from dorsal margin of eye, temporal puncture and occipital puncture near posterior margin; deflexed portion of head bearing 2–3 rows of small punctures. Frontal furrows and anteocular furrows deep, long, subequal to eye length, both almost arriving line connecting rearmost of each eye. Eye of medium size, longer than 1/3 of temple length (eye: temple = 0.30: 0.78 mm), protruding laterad. Epistoma protruding forwards, of subrectangular shape, anterior margin subtruncated. Distance between antennal insertions 0.27 mm, slightly longer than that from antenna to eye (0.24 mm).

Antennae. Scape stout, thickened apically, longer than three subsequent antennomeres combined, 0.63 mm; antennomere II elongate, slightly dilated subapically, 0.18 mm, equal to III; III elongate, 0.18 mm; IV and V transverse, subequal in length, 0.012 mm; last antennomere of medium length, 0.24 mm, subequal to preceding two antennomeres combined.

Neck. Medium width (0.36 mm), subequal to 1/3 of head width.

Pronotum (Fig. 1B). Subrectangular, distinctly elongated (PL to PW ratio 1.5), much longer than head, but slight narrower. Slightly widened anteriad, anterior margins quite oblique, lateral margins slightly sinuate, anterior angles not protruding, broadly rounded as posterior angles. Integument shiny, without microsculpture. Two rows of setiferous punctures presenting on each side, admedian row consisting of 9–11 punctures; lateral row, curvedly arranged, of 9–10 punctures; other irregular punctures scattered near anterior margin.

Mesoscutellum. Shiny, extensively covered with distinct microstriae, and with three small, irregular punctures.

Elytra (Fig. 1C). Subrectangular (EL to EW ratio 1.2), obviously wider than pronotum, but of same length. Humeri well developed, lateral margins slightly widened posteriorly, hind margin slightly angulated. Integument shiny and flattened, without microsculpture; each elytron with 8–9 rows of smaller punctures; deflexed portion with 5–7 rows of smaller setiferous punctures.

Abdomen. Cylindrical, broadest at segment VI. Tergites III–VII shiny, covered with superficial transverse microstriae, also distributed with small setiferous punctures, interspaces between punctures near 3–4 punctures’ diameter, denser laterobasally; each segment with a basal impression. Surface between two basal transverse carinae impunctate, but bearing distinct polygonal reticulum. each tergite with impunctate basal impression which bearing obvious 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 slightly protruding backwards (Fig. 1-1A), that of sternite VIII distinctly emarginated (Fig. 1-1B). Tergite IX symmetrical, connected mediobasally. Sternite IX symmetrical, with sharp-pointed base and distinctly emarginated posterior margin (Fig. 1-1C). Tergite X symmetrical and broad, with rounded base and subtruncated posterior margin (Fig. 1-1D), in situ broadly exposed between tergite IX. Median lobe of aedeagus elliptical, large sized (Fig. 1-1F), basal piece without transparent, membranous medial-longitudinal band; basal bulb 1.35 mm long (Fig. 1G, H), anterior portion short (Fig. 1E, F), subcylindrical, 0.30 mm. Parameres symmetrical and thin (Fig. 1-1E), 1/5 of basal bulb length. Internal sac with paired rows of solid, curved and dark spines (Fig. 1-1G).

Female. Unknown.

Distribution. China (Yunnan).

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

Remarks. This species could be distinguished from its congeners by: 1) body dark brown; 2) temple slightly parentheses-shaped, broadest at the middle; 3) head sparsely distributed with small punctures, interspaces between punctures over two punctures’ diameter; 4) surface between anteocular furrows bearing small punctures; 5) pronotum not widened anteriad, anterior margins quite oblique; 6) male tergite X rather broad, with rounded base and subtruncated posterior margin; 7) internal sac with paired rows of solid, curved and dark spines.