Panurginus arsenievi, Romankova, Tatiana G. & Astafurova, Yulia V., 2011

Romankova, Tatiana G. & Astafurova, Yulia V., 2011, Bees of the genus Panurginus in Siberia, Far East of Russia, and Allied Areas (Hymenoptera: Andrenidae, Panurginae), Zootaxa 3112, pp. 1-35 : 16-17

3. Panurginus arsenievi sp. n.

Diagnosis. Visually, Panurginus arsenievi sp. n. can be grouped with the species with smooth interspaces on the metasomal terga; S6 and S7 apical structures are close to those of P. n i g e r and P. romani as well. At the same time, the new species has enlarged apically gonostylus and parallel-sided penis valve (apically enlarged at the group members). S7, S8 and genitalia are relatively small, unsclerotized (excluding the penis valves). S8 is tremendously reduced to a small, narrow fragment lacking any noticeable morphological structures that has no analogies among the other studied species. The male of P. arsenievi is easily identifiable by its highly specific clypeus with apicolateral angles pooled twice as long as wide in the same plane with disc.

Etymology. Vladimir Klavdiyevich Arseniev (Russian∶ Владимир Клавдиевич Арсеньев﹔I872 — I93 O) was a Russian explorer of the Far East, ethnographer, teacher and writer. Arseniev is most famous for authoring many books about his explorations, including some 60 works on the geography, wildlife and ethnography of the regions he traveled. Arseniev's most famous book, Dersu Uzala (With Dersu the Hunter or Dersu the Trapper), is the author's memoirs of three expeditions in the Ussurian taiga, or forest, of Northern Asia along the Sea of Japan and North to Vladivostok. He was the first to describe numerous species of Siberian flora and lifestyle of native people.

Geographical distribution. Russia: Primorskiy Kray.

Type material. Holotype: 3, RUSSIA, Primorskiy Kray, Novitskoye, 20.VII.1984, SB [Приморский край, Новицкое, 20.VII.1984, 3, С. Белокобыльский; Holotype, Panurginus arsenievi ]. Paratypes: Russia, Primorskiy Kray: Anisimovka, 24.VII.2010, 13, MP; Novokachalinsk, 21−22. VII.2010, 13, MP ( IBSS).

Description. MALE. Body length 5–5.5 mm. Shape. Head transverse (0.75–0.8), wider than mesosoma. Antenna attaining posterior end of tegula, pedicel as long as wide, as long as F1; F1=F2=F3, F1 slightly elongate, F2 and F3 slightly transverse; other flagellomeres as long as wide or slightly longer. Clypeus with basal margin straight; latero-apical angles protruded, twice longer than wide, apically rounded ( Fig. 107 ). Labral plate apically rounded. Facial fovea shallow, short, matt, vary in shape and distance from eye. Genal area slightly narrower than eye (0.9), on most length parallel-sided, from 2/3 of length narrowing towards mandibles. Fore tarsus, spurs and tibia inside yellow. Middle basitarsus parallel-sided, 5 times longer than wide. Hind basitarsus parallel-sided, 4 times as long as wide, TM2 and TM3 conical, elongate, TM4 cordate, as long as wide. Metasomal terga with depressed marginal zones, on T1 and T2 ca 1/3, T3 and T4 ca 1/2 discal length. Metasomal Sterna & Genitalia ( Figs 106, 108–111 ). S2 and S3 with posterior margin incurved, S3–S5 on premarginal line with narrow, dense, yellowish hair fringe, on S5 wider. S6 with small apical emargination densely pubescent along margin and surrounded by less sclerotized area. S7 thin, film-like, apically with 2 parallel, pointed projections twice as long as sternal disk. S8 lacking any morphological structures; thin, small, 0.15 mm long, narrow, at middle bent ventrally at 120 (lateral view), rounded basally and pointed apically. Genitalia, unless the penis valves, thin and pale; gonocoxite narrow; gonostylus narrow, apically bulbous, with a spot of short hairs; penis valve dark, straight, parallel-sided, apically rounded. Sculpture. Vertex, frons, upper half of paraocular area matt, shagreened, with pits about a pit diameter apart (ca 10 µm / 0.5–1.5); lower half of paraocular area, supraclypeal and subantennal areas shiny, delicately tessellate, with pits 1–2 diameters apart. Clypeus shiny, smooth, with round pits 1–2 diameters apart (10–20 µm / 0.5– 3). Genal area shiny, delicately tessellate or smooth, with dense, small and large pits and pores (10–25 µm / 0.5– 1.5). Scutum shiny, tessellate, with round pits of different sizes irregularly spaced (5−20 µm / 1−4), on periphery denser to confluent. Scutellum shiny, delicately tessellate or smooth, with pits 2–4 diameters apart (10–25 µm), on periphery denser. Metanotum tessellate. Mesepisternum shagreened, on lower half smoother; with shallow pits and pores 1−2 diameters apart (10–20 µm). Propodeum shagreened, with sparse punctures; propodeal triangle basally rugose. Metasomal terga glossy, anteriorly tessellate, T4 and T5 completely tessellate; with sparse punctures a few diameters apart; marginal zones black, delicately tessellate or glossy. Metasomal sterna shiny, tessellate, with sparse pores; marginal zones pale, narrow. Coloration. Flagellum beneath yellowish-brown. Wing brown fumigated, veins and stigma brown. Clypeus yellow, distal margin narrowly and latero-apical angles widely black. Fore tarsus, spurs and tibia inside yellow. Middle basitarsus yellow. Hind basitarsus 1/3–1/4 proximal part internally yellow. Other tarsomeres brown. Vestiture. Pubescence unremarkable. Terga laterally, T4 and T5 on premarginal line with sparse, long, extended hairs; tergal discs with sparse, short, thin hairs. T6 and T7 with grayish, long hair fimbria. FEMALE unknown.

Discussion. By the type of male S6 and S7, this species approaches niger -group; but S8 and genitalia are too much specific. We assumed that the newly described species can be incorporated within the niger -group of species provisionally.

Figures

FIGURES 104 – 117. 104 — Panurginus romani, female, head; 105 — P. h e r z i, female, head; 106 – 111, P. arsenievi, male: 106 — genitalia dv, 107 — clypeus, 108 — S 8 v, 109 — S 8 l, 110 — S 7 v, 111 — S 6 v; 112 – 117, P. nigripes, male: 112 — genitalia dv, 113 — genitalia l, 114 — S 8 dv, 115 — S 8 l, 116 — S 7 v, 117 — S 6 v. Abbreviations: l—lateral, d—dorsal, v—ventral views. Lateral views oriented with the ventral side on right.