Eudorylas mongolorum Kuznetzov, 1990

Kehlmaier, Christian, 2005, Taxonomic studies on Palaearctic and Oriental Eudorylini (Diptera: Pipunculidae), with the description of three new species, Zootaxa 1030 (1), pp. 1-48 : 43-46

Eudorylas mongolorum Kuznetzov, 1990 ( Figs 14a–j )

Eudorylas mongolorum Kuznetzov 1990b: 390 .

Material studied

Thailand 1♂, Phat. Trang Botanical Gardens , 99°48'E 7 34.5'N, 17.II.1993, leg. H.­J. Flügel, coll. C. Kehlmaier.

Redescription

Male

Body length. 6.1mm.

Head. Face dark, silver­grey pollinose. Scape dark, with one upper bristle. Pedicel dark, with four strong upper and two strong and long lower bristles. Flagellum pale with darkened base, apically rounded and weakly greyish pollinose (LF:WF=2.1). Arista dark, flattened, with thickened base. Eyes not meeting, separated by less than diameter of ocellus for a distance of about 20 facets. Between antenna and posterior margin of ocellar triangle the lower half (width greater than ocellar diameter) is silver­grey pollinose. Along the following approximately 25 facets, the frons is weakly grey pollinose. Vertex (the following 13 facets) dark, lacking pollinosity, baring an elevated, equilateral ocellar triangle. Viewed laterally, occiput dark, grey pollinose, changing to brown in upper third. Upper half twice as broad as lower half.

Thorax. Prescutum, scutum, scutellum and pleura dark. Anepimeron, katatergite, anatergite, subscutellum and upper half of katepisternum and katepimeron silver­grey pollinose. Other pleural parts, especially anepisternum with very weak greyish pollinosity. Postpronotal lobe pale, weakly grey pollinose, with about six pale postpronotal hairs in upper half (up to 0.06mm). Prescutum and scutum narrowly silver­grey pollinose around postpronotal lobe and narrowly along lateral margin down to wing base, otherwise weakly brown pollinose, subshining, with two uniseriate dorsocentral rows of hair, some supraalar and postalar hairs. Scutellum weakly brown pollinose, subshining, covered with equally distributed but spares longer hairs and lacking a distinct apical hair fringe (up to 0.08mm).

Wing. Length: 5.0mm. LW:MWW=3.3. Wing with reduced microtrichia. Small basal cells of wing, e.g. bc, the basal two thirds of cell br, bm and cup and the basal quarter to third of c and anal lobe without or with greatly reduced microtrichia. Pterostigma dark and complete (LS:LTC=1.0). LTC:LFC=1.1. r­m reaches dm at basal quarter of the cells length. M 1 weakly undulating in its middle.

Halter . Length: 0.6mm. Base dark, stem pale and knob somewhat paler than base.

Legs. Coxae dark, front coxa with pale anteroapical margin. Front and mid coxae weakly grey pollinose, hind coxa silver­grey pollinose. Mid coxa with three dark anterior bristles on inner apical corner. Trochanters dark, weakly grey pollinose with shining patches. Mid trochanter with two dark anterior bristles on inner apical corner. Femora dark, with pale apices. Hind femur also with paler trochanter femoral joint. Front and mid femora with posterior side silver­grey, otherwise weakly grey pollinose. Hind femur weakly grey pollinose except for an narrow oval spot of silver­grey pollinosity situated on the anterior side towards the apex and shining on the posterior side. Mid femur baring two distinct rows of ventral peg­like spines, the anterior one restricted to apical three quarters or half. Front and hind femora in apical half with two distinct rows of ventral peg­like spines. Tibiae pale but darkened posteroventrally in apical half. Front and mid tibiae weakly grey pollinose but silver­grey pollinose on posterior surface, without apical spines and posteromedian bristles. Hind tibia weakly grey pollinose but silver­grey pollinose on anterior surface and with a wrinkled indentation midanteriorly lacking distinctly stronger bristles. Tarsi pale, weakly grey pollinose. Pulvilli shorter than distitarsi.

Abdomen. Ground colour dark. Tergite 1 with four long dark lateral bristles and silvergrey pollinose except dorsocentrally at posterior margin. Tergites 2 narrowly silver­grey pollinose along anterior margin, otherwise weakly brown pollinose, subshining. Tergite 3 to 5 posterolaterally with clearly defined spots of silver­grey pollinosity, largest on tergite 5 where they extend onto dorsal surface, otherwise weakly brown pollinose, subshining. Viewed dorsally ( Fig. 14h ), tergite 5 asymmetrical (T5R:T5L=1.2). LT35:WS8=1.7. Sternite 6 and 7 dark, grey pollinose. Syntergosternite 8 dark, weakly brownish pollinose. Viewed laterally, syntergosternite 8 conspicuously pointed, slightly higher than long (LS8:HS8=0.9). Viewed dorsally, syntergosternite 8 without a dorsal depression on side of outer surstylus but with a large, roundish membranous area that carries on as a narrow band on the ventral surface, almost touching the epandrium ( Figs 14h–j ). Sternite 1 to 5 dark, weakly brown pollinose.

Genitalia.

Genital capsule dorsal view: Epandrium dark, grey pollinose and wider than long (MLE:MWE=0.8). Surstyli pale and grey pollinose. Surstyli almost symmetrical, with a rather triangular ground shape. Outer surstylus with a small hook­like projection at inner margin towards apex ( Fig. 14b ).

Genital capsule ventral view: If hypandrium is viewed strictly ventral, the entire phallic guide is twisted by approximately 45° towards the outer surstylus ( Fig. 14a ). Gonopods inconspicuous and small ( Fig. 14a ). Phallus trifid and coiled twice ( Fig. 14a ). Phallic guide visible in ventrolateral view, rather long and complicated, bent towards dorsal surface by 45°, however apically pointing towards the original position again. Dorsally, it bares a small step covered with strong hairs. Hypandrial apodeme spoon­like ( Fig. 14a ), its deeply concave side being situated underneath the ejaculatory apodeme and sperm pump. It is mainly made up by the extended supepandrial sclerites plus the same sclerites as the phallic guide ( Fig. 14e ), best seen in dorsal view.

Genital capsule lateral view: Epandrium without projecting lobe on either side. Surstyli rather narrow and straight ( Figs 14c–d ).

Ejaculatory apodeme large and spade­shaped ( Fig. 14f ). Sperm pump cylindrical and with two projections that are situated opposite to each other ( Fig. 14g ).

Female see Kuznetzov (1990b).

Discussion

E. mongolorum is a very distinctive and enigmatic species of Eudorylini . Although differing considerably from all other known representatives of the genus by various structures of syntergosternite 8 including its genitalia (membranous area, phallic guide, hypandrial apodeme) it is left within Eudorylas for the time being.

Kuznetzov (1990b) described the species from two males and two females collected in Mongolia, also figuring male and female wing as well as the female antenna apart from various parts of the male genitalia. Of the simultaneously described subspecies Eudorylas mongolorum gobiensis Kuznetzov, 1990 (based on two females from Mongolia), he also presents the shape of the female ovipositor in lateral view. No original type material was obtained for study but the specimen from Thailand fits very well to the original description and figures and only seems to differ in that its compound eyes are entirely separated and not meeting in one point as in the male holo­ and paratype ( Kuznetzov 1990b).

With the discovery of E. mongolorum in Thailand, the distribution range of this species could be considerably enlarged from the Palaearctic into the Oriental region, the present collecting site being approximately 4690km away from the locus typicus.

Figures

FIGURE 14. Eudorylas mongolorum Kuznetzov, 1990. (a) Phallic guide, gonopods, hypandrium, hypandrial apodeme and phallus ventral view. (b) Surstyli strictly dorsal view. (c) Outer surstylus lateral view. (d) Inner surstylus lateral view. (e) Hypandrial apodeme dorsal view. ses: subepandrial sclerite. (f) Ejaculatory apodeme. (g) Ejaculatory apodeme. (h) Abdomen dorsal view. (i) Syntergosternite 8 caudal view. (j) Genital capsule ventral view. Scale bars = 0.1 mm.