Philydrodes (Minyphilydrodes) reticulatus 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 : 180-182

Philydrodes (Minyphilydrodes) reticulatus Shavrin , sp.n.

( Figs. 3 , 37, 40 , 44–45, 52–53, 58)

Type material examined: Holotype ♂ [The preparation of the aedeagus and apical abdominal segment in Canadian balsam was attached under the card with beetle]: SHAANXI PROVINCE: ‘ China: Shaanxi, Qin Ling Shan | 108.47 E, 33.51 N, Mountain W | pass at Autorote km 70, 47 km | S Xian, 2300–2500m, sifted | 26. – 30.08.1995, leg. M. Schülke’ <rectangular label, printed>, ‘Sammlung | M. Schülke | Berlin’ <green rectangular label, printed>, ‘ HOLOTYPE | Philydrodes (Minyphilydrodes) | reticulatus sp.n. | Shavrin A.V. des. 2016’ <red rectangular label, printed> (MNHUB).

Paratypes: 1 ♂ [The preparation of aedeagus, abdominal tergite VIII and sternite VIII, and apical abdominal segement in Canadian balsam was attached under the card with beetle], 5 ♀ [The preparation of abdominal tergite VIII, sternite VIII and apical apical abdominal segment in Canadian balsam was attached under the card with beetle]: same data as the holotype (4 ♀: cSch; 1 ♂; 1 ♀: cS).

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

FIGURES 50–57. Male (50, 52, 54, 56) and female (51, 53, 55, 57) abdominal sternites VIII of Philydrodes : 50‾51— Ph. michaeli , 52‾53— Ph. reticulatus , 54‾55— Ph. tibetanus , 56‾57— Ph. wrasei . Scale bars 0.1 mm.

One specimen without abdomen was not included in the type series (cSch).

Description. Measurements (n=7): WH: 0.76–0.85; LH: 0.55–0.67; LA (holotype): 2.60; LE: 0.20¯0.25; LT: 0.20; LPM/WPM (holotype): III: 0.20 × 0.07, IV: 0.10 × 0.03; LP: 0.65–0.78; WPMax: 0.68–0.80; WPMin: 0.55– 0.65; LEl: 1.46–1.62; WE: 1.45–1.75; WA: 1.45¯1.75; LMTb: 1.20–1.22; LMTr: 0.37–0.44; LAed: 0.60–0.62; TL: 4.20–5.15 (holotype: 4.35).

Head and abdomen brown, pronotum and elytra reddish brown; mouthparts, antennae and legs yellow brown; bases of antennomeres 1¯3 and ocelli yellow to yellow brown. Punctation of head regular, small and indistinct; punctation of pronotum denser and deeper than that on head, interspaces between punctures in median part of disc as diameter of 2–3 punctures, with small elongate impunctate area in medio-basal portion; punctation of elytra deeper and larger than that on pronotum, interspaces between punctures on median portion of each elytron as diameter of 1–2 punctures; abdomen with very dense, fine regular punctation. Microsculpture of pronotum finer than that on head with distinctly visible punctation on background of it; narrow band along basal margin with coarser and smaller ground sculpture. Habitus as in Fig. 3 .

Head 1.2¯1.3 times as broad as long. Eyes as long as temples or slightly longer. Maxillary palp segment 3 twice as long as apical (4th) segment. Antennomeres with lengths widths (holotype): 1: 0.27 0.10; 2: 0.20 0.07; 3: 0.25 0.07; 4–8: 0.23 0.07; 9–10: 0.23 0.08; 11: 0.27 0.08.

Pronotum slightly narrower than head, slightly broader than long. Elytra slightly more than twice longer than pronotum, as long as broad or slightly broader than long.

Male. Apical margin of abdominal tergite VIII rounded (Fig. 44). Apical margin of abdominal sternite VIII with narrow deep emargination (Fig. 52). Aedeagus ( Fig. 37 ) elongated, with small phallobase, median lobe narrowing after median part toward rounded apex; parameres thin, exceeding apex of aedeagus, with two apical and two postero-apical short setae; aedeagus with strongly sclerotized narrow dorsal lobe not reaching apex of aedeagus, with very thin long flagellum within it; endophallus with two elongated areas of thorns in apical third. Aedeagus laterally as in Fig. 40 .

Female. Apical margin of abdominal tergite VIII indistinctly rounded (Fig. 45). Apical margin of abdominal sternite VIII straight (Fig. 53).

Comparative notes. Based on the shape of narrow aedeagus with very small phallobase, Ph. reticulatus sp.n. is similar to Ph. michaeli sp.n., from which it differs by slightly wider median lobe and parameres, by the narrower apex of aedeagus, by the arrangment of parameral setae (all parameral setae of Ph. michaeli sp.n. are apical); furthermore it differs from other Chinese species by the more indistict punctation of head, by the longer eyes, by the narrower pronotum, by the slightly shorter elytra and by the shape of apical emargination of male abdominal tergite and sternite VIII.

Etymology. The specific epithet is a Latin adjective reticulatus (reticulate, meshy) and alludes to the presence of moderately strong microsculpture on the pronotum.

Distribution. The species is known from the type locality ( Fig. 58 ) in high altitudes of Qin Ling Shan range, Shaanxi, China.

Bionomics. According to the personal communication of M. Schülke, the specimens were collected in a place (2300–2500 m a.s.l.) with streams and large rocks overgrown with grass, bushes and small trees (mostly pines); the specimens were collected running on the ground, only at the surface of places forming small swampy areas with small patches of Alnus forest by sifting and near the water turning stones.

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 36 – 41. Aedeagus of Philydrodes michaeli (36, 39: holotype), Ph. reticulatus (37, 40: paratype) and Ph. wrasei (38, 41: paratype): 36 ‾ 38 — parameral view, 39 ‾ 41 — lateral view. Scale bars 0.1 mm.