Megalinus suffusus ( Sharp, 1874 )

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 : 54-58

Megalinus suffusus ( Sharp, 1874)

(Fig. 16A–C; Fig. 16-1A–J)

Sharp, 1874: 52 ( Xantholinus ; Type locality: Nagasaki); Bernhauer & Schubert, 1914: 308 (catalog); Cameron, 1949: 467 ( Japan); Nakane, 1963: 90 ( Megalinus ; characters; habitus photograph; Japan); Watanabe & Shibata, 1972: 63 (Yakushima Island); Bordoni, 1997: 174 ( Lepidophallus ; lectotype designation: Japan, Nagasaki; characters); Herman, 2001a: 3661 (catalog); Bordoni, 2002: 653 ( Taiwan, Japan; redescriptions); Bordoni, 2003d: 382 ( Korea; drawing of median lobe of aedeagus); Smetana, 2004: 689 (catalog; Liaoning, South Korea, Taiwan, Japan); Bordoni, 2007b: 70 (catalog); Bordoni, 2008: 58 ( Megalinus ; species list of Megalinus ); Bordoni, 2011: 27 ( Megalinus ; Taiwan).

Syn.: Lepidophallus flavus Bordoni, 2002: 652 ; Bordoni, 2008: 58 ( Megalinus ). [Part specimens in Bordoni, 2002: 652 should be as Megalinus suffusus ( Sharp, 1874) ].

Lepidophallus flavoelytratus Bordoni, 2007a: 11 (Type locality: China, Guizhou, Leishan Co., SE Kaili, NE Leishan, Leigong Shan). syn. nov.

Type materials: male, with labels as follows: “ PARATYPUS, Lepidophallus , flavus BORDONI 2002 ” / “'KUATUN,' FUKIEN, China 17.3.46, (TSCHUNG SEN.)”; female, with labels as follows: “ PARATYPUS, Lepidophallus , flavus BORDONI 2002 ” / “'KUATUN,' FUKIEN, China 6.3.46, (TSCHUNG SEN,)”; female, with labels as follows: “ PARATYPUS, Lepidophallus , flavus BORDONI 2002 ” / “Kuatun(2300m) 27.40n. Br., 117.40ö.L. J.Klapperich, 18.3.1938 (Fukien)” / “ Lepidophallus , suffusus (Sharp) , det. A.Bordoni 1995”; female, with labels as follows: “ PARATYPUS, Lepidophallus , flavus BORDONI 2002 ” / “Kuatun(2300m) 27.40n. Br., 117.40ö.L. J.Klapperich, 18.3.1938 (Fukien)” / “ Lepidophallus , suffusus (Sharp) , det. A.Bordoni 1995”; female, with labels as follows: “ PARATYPUS, Lepidophallus , flavus BORDONI 2002 ” / “Kuatun(2300m) 27.40n. Br., 117.40ö.L. J.Klapperich, 13.1.1938 (Fukien)” / “ Lepidophallus , suffusus (Sharp) , det. A.Bordoni 1995”; female, with labels as follows: “ PARATYPUS, Lepidophallus , flavus BORDONI 2002 ” / “Kuatun(2300m) 27.40n. Br., 117.40ö.L. J.Klapperich, 24.3.1938 (Fukien)” / “ Lepidophallus , suffusus (Sharp) , det. A.Bordoni 1995” ( NMW).

Addtional materials: with labels as follows: “ YAWATA, KYOTO, 4.I.1976, T. ITO ” / “ Megalinus , suffusus, ( Sharp, 1874) , det. TateoITO 2013”; with labels as follows: YAWATA, KYOTO, 5. VI.1983, T. ITO ” / “ Megalinus , suffusus, ( Sharp, 1874) , det. TateoITO 2013”; with labels as follows: YAWATA, KYOTO, 4.I.1976, T. ITO ” / “ Megalinus , suffusus, ( Sharp, 1874) , det. TateoITO 2013” (CI) ;; male, with labels as follows: “ HOLOTYPUS, Lepidophallus , flavoelytratus sp. n., Bordoni det. 2005” / “ CHINA: ' Guizhou,' Leishan Co., SE 'Kaili,' NE Leishan, Leigong 'Shan,' E-slope, ' 1700–1800 m,' 14.- 24.6.2001 ” / “env. of pass between, Leishan and Fangxiang, (26°22.74' N 108°12.99' E), leg. Schillhammer (7)” ( NMW); Jiangxi: FuzhouCity: Linchuan (E 116.3698, N 27.9971), 20 males, 5 females, 50 m , 16. V .2011 , Zhou Jianhua & Huang Xiaoyun collected; Shanghai (E 121.4737, N 31.2304): 2 exs., 02. IV.1938; 6 exs., 12. IV.1938; 1 ex., 20. IV.1939; 1 ex., 26. IV.1939; 7 exs., 09. IV.1939; 16 exs. ,, 11. V.1939; 3 exs., 06.XII.1938; 1 ex., 13. III.1939; 1 ex., 27. II.1939; 2 exs., 06. V.1939; 1 ex., 26. V.1939; 1 ex., 31. III.1938; 8 exs., 11. IV.1939; 1 ex., 09. IV.1917; 2 exs., 13.VIII.1939; 11 exs., 22.VIII.1939; 15 exs., 06.VIII.1939; 1 ex., 09.I.1940; 1 ex., 12. II.1946; 1 ex., 12. II.1945; 1 ex., 12. II.1941; 1 ex., 12. II.1944; 1 ex., 12. II.1947; 1 ex., 12. II.1935; 1 ex., 12. II.1951; 1 ex., 12. II.1958; 1 ex., 04. II.1938; 1 ex., 30. III.1938; 1 ex., 31. III.1938; 10 exs., 22.VII.1939; 3 exs., 07. VI.1935; 1 ex., 12. V.1936; 1 ex., 29.IX.1950; 3 exs., 22. V.1939; 1 ex., 12. II .1955 ; 1 ex., Sheshan , 16. VI .1947 ; 5 exs.; Fujian: Wuyishan City: Congan co.: Xingcun : Shilichang (E 117.6590, N 27.7220), one male, 840 m, 25. V .1960 , Jiang Shengqiao collected; Zhejiang: Kaihua co.: Gutianshan Nature Reserve (E 118.1454, N 29.2572), 4 males, 6 female, 14. V .2008 , Zhao Zongyi collected; Shangdong: Qingdao, 2 exs. ( IZ-CAS).

Description.

Measurements. BL= 9.5 mm, FL= 4.6 mm, HL= 1.4 mm, HW= 1.2 mm, PL= 1.5mm, PW= 1.1 mm, EL= 1.6 mm, EW= 1.6 mm.

Body cylindrical, large sized, sometimes smaller (7.9 mm). Body black or dark brown, except elytra yellowish, sometimes surface along medial suture whitish. Legs, maxillary and labial palpi entirely brown. Antennae dark brown, except scape black, apical 1/3 of last antennomere yellowish.

Head (Fig. 16A). Subquadrated (HL to HW ratio 1.1), temple obviously widened posteriorly, sometimes slightly widened, posterior angles rounded. Dorsal integument shiny, without microsculpture, but extensively with micropunctures, also distributed with round, medium-sized punctures, interspaces between punctures 1–2 puncture diameters; no additional small puncture presenting; frontal region wrinkled, with shallow, broad medial longitudinal furrow, large region of disc (0.40 mm width) without any punctures. Each side of cranium also with frontal puncture on epistoma, one anterolateral puncture near antennal insertion, three medium-sized punctures on frontal region, midlateral puncture approximately a distance of 4–5 punctures’ diameter from dorsal margin of eye, temporal puncture and occipital puncture near posterior margin of head; deflexed portion of head bearing 2–3 rows of small punctures. Frontal furrows deep and long, convergent backwards to a point, anteocular furrows broader and deeper, both as long as eye length and arriving line connecting rearmost of each eye. Eye of medium size, longer than1/3 of temple length (eye: temple = 0.33: 0.81 mm), obviously protruding laterad. Epistoma protruding forwards, of subrectangular shape, anterior margin subtruncated. Distance between antennal insertions 0.30 mm, longer than that from antenna to eye (0.27 mm).

Antennae. Scape stout, thickened apically, longer than three subsequent antennomeres combined, 0.63 mm; antennomere II elongate, slightly rounded subapically, 0.21 mm, distinctly longer than III; III elongate, 0.15 mm; IV and V transverse, subequal in length, 0.09 mm; last antennomere of medium length, 0.21 mm, subequal to preceding two antennomeres combined.

Neck. Medium width (0.51 mm), slightly wider than 1/3 of head width.

Pronotum (Fig. 16A). Subrectangular, distinctly elongated (PL to PW ratio 1.4), slightly longer than head, but slight narrower. Obviously widened anteriad, lateral margins slightly sinuate, anterior angles protruding and slightly rounded, posterior angles broadly rounded. Integument shiny, microsculpture missing, micropunctures presenting. Two rows of setiferous punctures presenting on each side, admedian row consisting of 7–9 punctures; genital segments, ventral view. Scale bars 0.30 mm.

Elytra (Fig. 16A). Short (EL to EW ratio 0.9), slightly longer than pronotum, but distinctly wider. Humeri well developed, lateral margins widened posteriorly, hind margin slightly arcuate backwards. Integument shiny and flattened, without microsculpture; each elytron with 6–8 rows of medium-sized punctures; deflexed portion with 4– 5 rows of smaller setiferous punctures.

Abdomen. Cylindrical, broadest at segment VI. Tergites III–VII shiny, covered with distinct transverse microstriae and small setiferous punctures, interspaces between punctures near 3–4 punctures’ diameter; each segment with basal impression. 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 arcuate backwards, that of sternite VIII emarginated forwards (Fig. 16-1A, B). Tergite IX symmetrical, connected mediobasally. Sternite IX symmetrical, with acuminate base and broadly emarginated posterior margin (Fig. 16C; Fig. 16-1C). Tergite X symmetrical, with sharpened base or truncated basal margin, posterior margin with a concave medially, sometime not obvious (Fig. 16B; Fig. 16-1D, E), in situ broadly exposed between tergite IX. Median lobe of aedeagus elliptical, large sized (Fig. 16F–G), basal piece without transparent, membranous medial-longitudinal band; basal bulb 0.81 mm long, anterior portion short, slightly tapered apically, 0.24 mm. Parameres symmetrical and long, slightly longer than 1/3 of basal bulb length. Internal sac soft, curved, bearing scales, medium portion with darker spines.

Female. Posterior margin of sternite VIII sharpened backwards(Fig. 16-1I, J). Genital segment large sized (Fig. 16-1K), 1.02 mm long, sternite with slightly bisinuate basal margin, supplementary paired sclerites subtriangular and large sized, 0.40 mm long, overlapped 2/3 part of basal margin of genital sternite.

Distribution. China (Jiangxi, Zhejiang, Shanghai, Fujian, Gansu, Guizhou, Qinghai).

Remarks. This species could be distinguished from its congeners by: 1) elytra yellowish, sometimes surface along medial suture whitish; 2) posterior half of frontal region wrinkled; 3) 2/3 anterior part of frontal furrow parallel, rest 1/3 convergent together; 4) scapes of antennae quite stout; antennomere II oblong with rounded apex, longer than III; 5) lateral row of pronotum composed of 6–7 punctures, curvedly arranged; 6) male tergite X fanlike, posterior margin with a small median rounded notch, sometimes indistinct; 7) soft inner sac, coiled one time, without any sclerotized structures. Firstly, thanks to the curator’s permission to examine all paratypes of M. flavus ( Bordoni, 2002) , we found five paratypes (one male, 4 females) which are morphologically same as M. suffusus (Sharp) . Therefore, we regard the five paratypes of M. flavus (Bordoni) to be synonymous with M. suffusus (Sharp) . Secondly, Bordoni (2007) designated a lectotype for Lepidophallus flavoelytratus .. After examining the holotype of M. flavoelytratus (Bordoni, 2007) , we found that the difference of inner sac is artificial due to the compressed morphological change of inner sac; and the varible tergite X should be regarded as conspecific variation as well. Comparing the external and internal characters of M. flavoelytratus (Bordoni, 2007) with those of M. suffusus ( Sharp, 1874) from China and Japan, we consider M. flavoelytratus (Bordoni, 2007) to be synonymeous with M. suffusus ( Sharp, 1874) : Megalinus suffusus ( Sharp, 1874) = M. flavoelytratus (Bordoni, 2007) syn. n.