Philydrodes (Minyphilydrodes) tibetanus Shavrin

Shavrin, Alexey V., 2017, Five new species of the genus Philydrodes Bernhauer, 1929 from China (Coleoptera: Staphylinidae: Omaliinae: Anthophagini), Zootaxa 4231 (2), pp. 169-186 : 182-183

Philydrodes (Minyphilydrodes) tibetanus Shavrin , sp.n.

( Figs. 4 , 33–35 , 46–47, 54–55, 58)

Type material examined: Holotype ♂ [The preparation of aedeagus and apical abdominal segment in Canadian balsam was attached under the card with beetle]: YUNNAN PROVINCE: ‘ CHINA: N-Yunnan [C 2005-07] | Diqing Tibet [an]. Aut [onomous]. Pref [ecture]., | Deqin Co., Meili Xue Shan, E-side, | 12 km SW Deqin, 2890 m, | 28°25.30ʹN, 98°48.47ʹE’ <rectangular label, printed>, ‘small creek valley, mixed forest | with bamboo, leaf litter, moss, | dead wood, sifted , 9.VI.2005, | leg. M. Schülke [C 2005-07]’ <rectangular label, printed>, ‘ Museum für Naturkunde | Berlin | Sammlung M. Schülke’ <rectangular label, printed>, ‘ HOLOTYPE | Philydrodes (Minyphilydrodes) | tibetanus sp.n. | Shavrin A.V. des. 2016’ <red rectangular label, printed> ( MNHUB) .

Paratypes: 1 ♂ [The preparation of aedeagus and apical abdominal segment in Canadian balsam was attached under the card with beetle], 1 ♀: same data as the holotype (1 ♀: cSch; 1 ♂: cS) ; 1 ♀ [Abdominal tergite VIII and sternite VIII, apical abdominal segment are glued on the same card under the beetle]: ‘ CHINA: N-Yunnan Diqing Tibet | Aut . Pr.Deqin Co. Meili Xue | Shan E-side 12km SW Deqin | 28°25.30ʹN 98°48.47ʹE 2890m | 9.VI.2005 A. Smetana [C156]’ <old broadleaved forest with lush undergrowth; specimens taken by sifting moist to wet moss on large rocks and rotting wood directly in the creek; A. Smetana, pers. comm.>, <rectangular label, printed> ( NSMT) .

All paratypes with my additional label: ‘ PARATYPE | Philydrodes (Minyphilydrodes) | tibetanus sp.n. | Shavrin A.V. des. 2016’ <red rectangular label, printed>.

Description. Measurements (n=4): WH: 0.76–0.85; LH: 0.56–0.63; LA (holotype): 2.91; LE: 0.25¯0.28; LT: 0.15¯0.18; LPM/WPM (holotype): III: 0.22 × 0.09, IV: 0.12 × 0.03; LP: 0.75–0.85; WPMax: 0.75–0.80; WPMin: 0.53–0.55; LEl: 1.25–1.50; WE: 1.65–1.84; WA: 1.52¯1.82; LMTb: 1.25–1.35; LMTr: 0.46–0.52; LAed: 0.80– 0.85; TL: 4.15–4.56 (holotype: 4.45).

Body brown, elytra reddish brown (two immature paratypes with yellow-brown body); labrum, mandibulae, mandibular palpomere 3, ocelli, antennae, legs and abdomen from tergite VII to apex yellow brown to reddish brown; mandibular palpomeres (except palpomere 3), labium, basis of antennomeres 1¯2 and tarsi yellow. Punctation of head moderately coarse, distinctly denser on infraorbital ridges; puctation of pronotum as that on head, regular; punctation of elytra as that on pronotum, significantly sparser, interspaces between punctures in median part of each elytron as diameter of 4¯5 punctures. Head with coriaceous microsculpture, distinctly coarser on anterior parts of infraorbital ridges; microsculpture of pronotum more flattened, fine, sometimes indistinct medially. Habitus as in Fig. 4 .

Head 1.3 times as broad as long. Eyes 1.5–1.6 times longer than temples. Antennomeres with lengths widths (holotype): 1: 0.35 0.12; 2: 0.18 0.07; 3: 0.27 0.07; 4–7: 0.22 0.07; 5–10: 0.22 0.08; 11: 0.35 0.09.

Pronotum 1.01–1.05 times narrower than head, as broad as long or slightly narrower. Elytra 1.6–1.7 times longer than pronotum, 1.2–1.3 times broader than long. Metarsomere less than three times shorter than length of metatibia.

Male. Apical margin of abdominal tergite VIII slightly rounded (Fig. 46). Apical margin of abdominal sternite VIII with small emargination (Fig. 54). Aedeagus ( Fig. 33, 35 ) with very wide phallobase gradually narrowing apicad, with narrow median lobe, forming two short latero-apical and apical projections similar to that of Ph. tridentatus sp.n.; parameres thin, almost reaching apex of aedeagus, with two apical and two latero-apical setae; aedeagus with sclerotized elongated dorsal lobe with split apex closely exceeding apical projection of median lobe, with distinct long flagellum within it; flagellum thin, with acute apex, reaching apical third of aedeagus, with very wide rounded basal part; endophallus complex, with two areas of elongated and short triangular thorns. Aedeagus laterally as in Fig. 34 .

Female. Apical margin of abdominal tergite VIII straight (Fig. 47). Apical margin of abdominal sternite VIII rounded (Fig. 55).

Comparative notes. By the characteristic shape of the apical part of the median lobe of the aedeagus, it is similar to Ph. tridentatus sp.n. and Ph. wrasei sp.n. From Ph. tridentatus sp.n. it differs by the smaller phallobase and narrower median lobe of the aedeagus; additionally, it differs by the less coarse microsculpture of the head and pronotum, by the slightly narrower pronotum. From Ph. wrasei sp.n. it differs by the wider aedeagus and longer apical projections of the median lobe; additionally, it differs by the shorter metatibiae, by the shape of apical margins of male and female abdominal tergites and sternites VIII. From both species it can be distinguished by the smaller punctation of pronotum, by the significantly wider flagellum and by the more complicated structure of the internal sac.

Etymology. The species is named after the mountain region, where the species occurs.

Distribution. The species is known only from the type locality ( Fig. 58 ) in Meili Xue Shan range in Diqing Tibetan Autonomous Prefecture, Yunnan, China.

Bionomics. The specimens were collected in one locality by sifting of moist to wet mosses and leaf litter near banks of streams in mixed (? broadleaved) forest. The species is recorded from elevation 2890 m a.s.l.

Figures

FIGURE 58. Distribution of Philydrodes in China: Ph. tridentatus (black circles), Ph. michaeli (black star), Ph. reticulatus (black square), Ph. tibetanus (black rhomb), Ph. wrasei (black triangle).

FIGURES 1 – 5. Habitus of Philydrodes: 1 — Ph. tridentatus, holotype, 2 — Ph. michaeli, paratype, 3 — Ph. reticulatus, paratype, 4 — Ph. tibetanus, holotype, 5 — Ph. wrasei, paratype. Scale bars 1.0 mm.

FIGURES 30 – 35. Aedeagus of Philydrodes tridentatus (30 ‾ 32: paratype) and Ph. tibetanus (33 ‾ 35: paratype): 30, 33 — parameral view, 31, 34 — lateral view, 32, 35 — ventral view. Scale bars 0.1 mm.