Megalinus liupanshanensis 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 : 14-17

Megalinus liupanshanensis Zhou & Zhou , sp. nov.

(Fig. 3A–F; Fig. 3-1A–F)

Type material. Holotype: male, CHINA: Ningxia: Liu panshan: Heshangpulinchang (E 106.2462, N 35.6761), 2100 m, 04.VII. 2008, Rou Qiaozhe collected ( IZ-CAS).

Description

Measurements. BL= 10.5 mm, FL= 5.1 mm, HL= 1.5 mm, HW= 1.4 mm, PL= 1.7 mm, PW= 1.3 mm, EL= 1.7 mm, EW= 1.6 mm.

Body cylindrical (Fig. 3D), large sized. Body dark brown, except elytra reddish. Apical 1/3 of last antennomere yellowish brown. Maxillary and labial palpi brown.

Head (Fig. 3A). Subquadrated (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. 0.25 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 = 0.33: 0.93 mm), slightly protruding laterad. Epistoma protruding forwards, of subrectangular shape, anterior margin subtruncated. Distance between antennal insertions 0.36 mm, equal to that from antenna to eye (0.36 mm).

Antennae. Scape stout, thickened apically, longer than three subsequent antennomeres combined, 0.69 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, 0.09 mm; last antennomere of medium length, 0.24 mm, subequal to preceding two antennomeres combined.

Neck. Medium width (0.57 mm), slightly wider than 1/3 of head width.

Pronotum (Fig. 3B). Subrectangular, distinctly elongated (PL to PW ratio 1.4), longer than head, but slightly narrower. Obviously widened anteriad, lateral margins convergent backwards, anterior angles protruding and slightly angulated, posterior angles broadly rounded. Integument shiny, extensively bearing micropunctures, but without microsculpture. Two rows of setiferous punctures presenting on each side, admedian row consisting of 11– 13 punctures; lateral row, curvedly arranged, of 12–13 punctures; other irregular punctures scattered near anterior margin.

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

Elytra (Fig. 3C). 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 impunctate, 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 slightly emarginated or subtruncated (Fig. 3-1A), that of sternite VIII subtruncated (Fig. 3-1B). Tergite IX symmetrical, connected mediobasally. Sternite IX, with sharp base and broadly arcuate posterior margin (Fig. 3-1C). Tergite X symmetrical and narrow, with slightly rounded base and broadly emarginated posterior margin, in situ broadly exposed between tergite IX (Fig. 3-1D). Median lobe of aedeagus rather oblong, large sized (Fig. 3E, F; Fig. 3-1E, F), basal piece with transparent, membranous medial-longitudinal band, anterior portion subcylindrical, 0.26 mm; basal bulb 1.13 mm long. Parameres symmetrical, elongate, slightly longer than 1/3 of basal bulb. Internal sac of S-shaped and densely spinulate.

Female. Unknown.

Distribution. China (Ningxia).

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) body large sized, elytra reddish; 2) lateral margins of pronotum convergent backwards; 3) admedian row of pronotum consisting of 11–13 punctures and lateral row, curvedly arranged, of 12–13 punctures; 4) tergites III–VII covered with superficial transverse microstriae; 5) posterior margins of tergite VIII slightly emarginated or subtruncated; 6) tergite X symmetrical and narrow, with rounded base and broadly arcuate posterior margin; 7) median lobe of aedeagus rather oblong; 8) basal piece with transparent, membranous medial-longitudinal band; 9) internal sac S-shaped and densely spinulate.