Megalinus coracinus ( Zheng, 1994 )

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 : 33-34

Megalinus coracinus ( Zheng, 1994)

(Fig. 9B; Fig. 10 )

Zheng, 1994: 350, 352 ( Lepidophallus ; Type locality: China: Sichuan, Mt. Jin-yun, Chongqing, 800–919 m); Herman, 2001a: 3660 (catalog); Smetana, 2004: 689 (catalog; Sichuan); Bordoni, 2008: 58 ( Megalinus ; species list of Megalinus ).

Type material: female, with labels as follows: “ PARATYPUS, Lepidophallus coracinus sp. nov. det. Zheng ” / “ 1985.V.16, leg. Wang Changqiong ” / “ Sichuan, Jinyunshan ” ( CZ) .

Description

Measurements. BL=9.0 mm, FL= 5.5 mm, HL= 1.7 mm, HW= 1.4 mm, PL= 1.8 mm, PW= 1.3 mm, EL= 1.8 mm, EW= 1.8 mm.

Body cylindrical, large sized. Body entirely dark brown.

Head (Fig. 9B). Subrectangular (HL to HW ratio 1.2), temple not widened posteriorly and subparallel, posterior angles slightly rounded. Dorsal integument shiny, without microsculpture, but densely distributed with round, deep, large punctures, interspaces between punctures less than half of punctures’ diameter, except a narrow, impunctate longitudinal median band. Each side of cranium also with frontal puncture on epistoma, anterolateral puncture near antennal insertion, five large punctures on frontal region, midlateral puncture approximately a distance of 4–5 punctures’ diameter from dorsal margin of eye, temporal puncture at posterior 1/8, and occipital puncture at lateral 1/3; deflexed portion of head bearing 5–6 rows of small punctures. Frontal furrows straightly convergent, deep and long as anteocular furrows. Anteocular furrows nearly arriving line connecting posterior 1/3 of each eye. Eye large, slightly shorter than 1/2 of temporal length (eye: temple = 0.43: 0.93 mm), distinctly protruding laterad. Epistoma protruding forwards, of subrectangular shape, anterior margin subtruncated. Distance between antennal insertions 0.43 mm, longer than that from antenna to eye (0.38 mm).

length, 0.08 mm; last antennomere of medium length, 0.23 mm, equal to length of preceding two antennomeres combined.

Neck. Medium width (0.55 mm), slightly wider than 1/3 of head width.

Pronotum (Fig. 9B). Subrectangular, distinctly elongated (PL to PW ratio 1.6), as long as head, but narrower. Anterior angles well-developed and protruding, lateral margins slightly sinuate, posterior angles broadly rounded. Integument shiny, two rows of setiferous punctures presenting on each side, admedian row consisting of 10–11 punctures; lateral row, curvedly arranged, of 10–12 punctures; other irregular punctures scattered near anterior margin.

Mesoscutellum. Shiny, extensively covered with obvious transverse microstriae, and with a pair of small punctures near apex.

Elytra (Fig. 9B). Subquadrate (EL to EW ratio 1.0), of same length to pronotum, but distinctly wider. Humeri well developed, lateral margins widened posteriorly, hind margin arcuate backwards. Integument shiny and flattened, without microsculpture; each elytron with 6–7 rows of punctures, which smaller than those on head and pronotum; deflexed portion with 6–7 rows of smaller punctures.

Abdomen. Cylindrical, broadest at segment VI. Tergites III–VII shiny, covered with shallow transverse microstriae, and also bearing small setiferous punctures, interspaces between punctures near 2–3 punctures’ diameter, denser laterobasally; each segment with a impunctate basal impression, which bearing transverse microstriae mixed with polygonal reticulum at lateral portion. All abdominal sternites shiny, with microsculpture and setiferous punctures as those on tergites.

Male. Median lobe of aedeagus subelliptical, basal piece without transparent, membranous mediallongitudinal band, anterior portion cylindrical; parameres symmetrical short, equal to 1/3 of basal bulb length. Internal sac spiral, with a row of spines at middle of apical half ( Fig. 10 ).

Distribution. China (Chongqing).

Remarks. This species could be distinguished from its congeners by: 1) body entirely dark brown; 2) temple not dilated, and subparallel; 3) head punctation; 4) scape of antennae quite long; 5) internal sac morphology.

Figures

FIGURE 10. Dorsal view of median lobe of aedeagus of Megalinus coracinus (Zheng).