Glischrochilus (Librodor) ruzickai, Jelínek & Hájek, 2018

Jelínek, Josef & Hájek, Jiří, 2018, Two new species of Glischrochilus with taxonomic comments, new records from Asia, and a world checklist of the genus (Coleoptera: Nitidulidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 58 (2), pp. 567-576 : 571-572

Glischrochilus (Librodor) ruzickai sp. nov.

( Figs 2 , 7–11 )

Type locality. China, Yunnan province, Dehong prefecture, Yingjiang county, 1 km NW Tongbiguan village, ca. 24°37.0′N, 97°39.0′E.

Type material. HOLOTYPE: J ( NMPC), labelled:‘ CHINA: YUNNAN PROV. / 1 km NW TONGBIGUAN / 24°37.0′N, 97°39.0′E, 1435 m / J. Hájek & J. Růžička leg. [p] // 24.-27.VI.2016, individually / from fresh fallen logs and / tree stumps; secondary / broadleaved forest [p] // HOLOTYPE J / GLISCHROCHILUS / ruzickai sp.nov. / Jelínek & Hájek det.2018 [p, red label]’. Note.Left antenna of the holotype missing. PARATYPES: 1♀, same data as holotype ( NMPC); 1♀, ‘ CHINA:S-YUNNAN / (Xishuangbanna) / 20 km NW Jinghong / vic.Man Dian ( NNNR) // N22°07.80, E100°40.05 / 08.VII.2009,forest, EKL / 730 m, leg.L.Meng [p]’ ( NKME); 2♀♀, ‘China, N Sichuan, 5.-6.vi. / Micang Shan, 1300-1400 m / DABA, 32°40′N, 108°55′E / Jaroslav Turna leg. 2007 [p]’ ( NMPC); 1 ♀, ‘ MYANMAR: Kachin State / 1.5 km W of Putao, 550 m, / 3.6.1999 (62) / lg. Schuh [p]’ ( RSCW). Each paratype with the respective red label.

Description. Male holotype. Oval, convex, smooth and shining. Black, antennae, excepting black club, and tarsi brown. Each elytron with three round orange spots situated at base besides scutellar shield, at one fourth of length of lateral margin and at three fourths of elytron length. Body length 5.5 mm, width 2.8 mm ( Fig. 2 ).

Head almost as wide as anterior pronotal margin (ratio HEAW/WPR3 = 0.98). Frons moderately convex, indistinctly impressed above insertions of antennae. Punctures besides eyes deep, larger than eye-facets, separated by 0.5–1.0 diameters, becoming gradually finer and smaller mesad and anteriad. Interspaces smooth and shining. Antennae almost as long as width of head across eyes (ratio ANLE/HEAW = 0.95), antennal club oval (ratio ANCL/ ANCW = 2.12), occupying ca. one third of antennal length (ratio ANCL/ANLE = 0.31). Antennal furrows deep, converging posteriad, with both inner and outer margins raised.

Pronotum transverse (ratio WPR2/LEPR = 1.50), widest near posterior angles, slightly narrowed posteriad (ratio WPR1/WPR2 = 0.98) and distinctly so anteriad (ratio WPR2/WPR3 = 1.59). Anterior margin broadly arcuate, not bordered, anterior angles acute, bordered, projecting anteriad. Lateral margins in basal half flatly, in anterior half distinctly arcuate, not explanate. Basal margin not bordered, truncate in front of scutellum, on sides feebly concave. Posterior angles obtusely angulate with blunt tips, not projecting posteriad. Pronotal disc broadly convex, punctures corresponding to those at midpoint of frons and nearly equal in size to eye facets, separated by 1.5–2.0 diameters; interspaces smooth and shining. Scutellar shield nearly twice as wide as long, rounded, impunctate.

Elytra widest in basal third, more strongly narrowed posteriad than anteriad, broadly separately rounded apically, reaching their maximum length in sutural half; ratio WPR2/WELY = 0.98, LELY/WELY = 1.12. Disc strongly transversely vaulted. Lateral margins not explanate, just visible simultaneously from above in their entirety. Punctures equal in size to those of pronotum, but distinctly closer, separated by one diameter; interspaces smooth and shining. Sutural lines distinct, reaching basal third of suture.

Pygidium with punctures nearly equal in size to those of elytra, but separated by ca. 0.5 diameters, apex broadly and flatly rounded, almost subtruncate. Posterior margin of tergite VIII exposed.

Ventral part. Mentum transverse with anterior margin broadly convex, densely punctate. Submentum as well as ventral portion of genae coarsely punctate, punctures larger than eye facets, separated by less than one diameter, interspaces reticulate. Prosternum transversely convex in middle, shallowly concave in front of procoxae; punctures larger than eye facets and separated by less than one diameter, interspaces smooth (in middle) or obsoletely reticulate (on sides). Hypomera concave, impunctate, with fan of fine wrinkles diverging from outer corner of procoxal cavities. Prosternal process flat, broadly rounded apically, in basal half coarsely rugosely punctate, in apical half smooth with fine and sparse punctures; punctures nearly as large as eye facets and separated by more than one diameter ( Fig. 7 ). Posterior intercoxal margin of mesoventrite shallowly arcuate. Metaventrite broadly transversely convex, in middle depressed, its posterior intercoxal margin shallowly arcuate; punctures nearly equal in size to eye-facets, separated by several diameters, interspaces smooth and shining in medially, finely reticulate laterally. Caudal marginal lines of mesocoxal cavities arcuately interconnected in middle, closely bordering posterior margin of mesocoxal cavity, their outer recurrent portion running subparallel to sternopleural suture and vanishing near posterior corners; axillary spaces small. Abdominal ventrites punctate like metaventrite, but punctures finer and interspaces finely reticulate, shining.

Legs. Ratio of distances between pro-, meso- and metacoxae as 3:4:5. Femora oval, ratio LFE1/WFE1 = 2.37, LFE2/WFE2 = 2.72, LFE3/WFE3 = 2.91. Anterior tibia straight, subtriangular, widest at distal end, ratio LTI1/ WTI1 = 3.57. Outer subapical angle acute, not projecting from outline of tibia. Meso- and metatibiae similar, ratio LTI2/WTI2 = 3.57, LTI3/WTI3 = 4.28. Protarsomeres I–III dilated, bilobed, 0.70× width of tibia, protarsomere V as long as I–III combined. Tarsal claws simple. Meso- and metatarsomeres I–III shallowly bilobed, narrow, half width of corresponding tibia.

Male genitalia. Tegmen oval, apically rounded ( Fig. 9 ); median lobe almost parallel-sided, apex not protruding, pointed ( Fig. 8 ); armature of endophallus as in Fig. 10 .

Female. Habitus corresponding to male; head capsule narrower than in male (ratio HEAW/ WPR3 = 0.91–0.97); pronotum more strongly narrowed anteriad (ratio WPR1/ WPR3 = 1.60–1.69); protarsomeres I–III narrower, 0.58× width of protibia; pygidium subtruncate apically, tergite VIII not exposed. Ovipositor as depicted in Fig. 11 .

Differential diagnosis. Glischrochilus ruzickai sp. nov. differs from all hitherto known Old World species of the subgenus Librodor in the following combination of characters: (i) pronotum with uniform punctation, (ii) posterior pronotal angles not projecting posteriad, (iii) pronotal base not bordered, (iv) each elytron black with three round orange spots, and (v) ventral surface and pygidium blackish brown to black.

Border of the basal pronotal margin is either absent or indistinctly developed in several species of Glischrochilus from Asia: G. flavoguttatus ( Reitter, 1875) , G. flavipennis ( Reitter, 1875) , G. luteoniger Jelínek, 1982 , G. mirabilis Jelínek, 1975 , G. pantherinus ( Reitter, 1879) , G. pallidescriptus Jelínek, 1999 . All these species differ from G. ruzickai sp. nov. in their colour pattern and other traits. Glischrochilus flavoguttatus from Himalaya also has black elytra, each with three round yellow spots, but differs in having red pronotum, shorter and bluntly pointed anterior pronotal angles as well as finer and sparser punctation of elytra. Its sutural line is distinct only in posterior half of elytra, whereas it reaches basal fourth of suture in G. ruzickai sp. nov.

Colour pattern of G. ruzickai sp. nov. resembles that of G. parvipustulatus ( Kolbe, 1886) and G. tibetanus Lasoń, 2016 . However, both these species are as a rule much larger (body length 8.5–12.2 mm in G. tibetanus , 6.0– 10.8 mm in G. parvipustulatus ), have distinctly bordered basal margin of pronotum, and pronotal punctures on sides markedly larger and closer.

Etymology. Dedicated to our friend and one of the collectors of the new species, Jan Růžička (Prague, Czech Republic), a well-known specialist on Silphidae and Leiodidae ; the specific epithet is a noun in the genitive singular. Collecting circumstances. At the type locality, the specimens were found sitting on sapping, freshly cut logs, lying in the hollow way through the secondary broadleaved forest ( Fig. 12 ).

Distribution. The species is known from south-western China (Sichuan and Yunnan provinces) and northern Myanmar.

Figures

Figs 1–2. Dorsal habitus of Glischrochilus species. 1 – G. pilula sp. nov. (J holotype); 2 – G. ruzickai sp. nov. (♀ paratype, Myanmar).

Figs 3–11. Details of Glischrochilus species. 3–6 – G. pilula sp. nov.; 7–11 – G. ruzickai sp. nov. 3, 7 – prosternal process; 4, 8 – median lobe of aedeagus; 5, 9 – tegmen; 6, 10 – armature of endophalus; 11 – ovipositor. Scale bars = 0.25 mm.

Fig.12.Type locality of Glischrochilus ruzickai sp. nov. Freshly cut logs, lying on the hollow way through the secondary broadleaved forest near Tongbiguan village, Yunnan Province, China.