Heleomyza kovali, Preisler & Tkoč, 2018

Preisler, Jiří & Tkoč, Michal, 2018, Two new species of Heleomyzidae (Diptera) from Czech Republic and Crimea, Acta Entomologica Musei Nationalis Pragae 58 (1), pp. 267-274 : 268-271

Heleomyza kovali sp. nov.

( Figs 1–8 )

Type locality. Czech Republic, Bohemia, Jizerské hory Mts., Smrk Mt., Ztracený potok stream, 50°53′43′′N, 15°14′53′′E, 690 m a.s.l.

Type material. HOLOTYPE: ( NMPC, genitalia prep.), ‘CZ-BOHEMIA b. (5157) Jizerské hory, / Smrk Mt. Ztracený potok- Libverdský / most (masová past) 23.9.-1.11.06 2006 / J. Preisler & Vonička lgt. // H O L O T Y P E [b] / Heleomyza kovali [b] / sp. nov. J. Preisler & / M. Tkoč det. 2016 / [red label] ’. PARATYPES: 1 ( JPLC, genitalia prep.): ‘CZ: Podyjí NP, Vraní skála / mixed wood, MT, 390 m / 48°51′03′′N, 15°53′42′′E / Meixnerová [lgt.], 28.x.[20]03-5.ii.[20]04 // Scoliocentra / brachypterna / det. V. Martinek // P A R A T Y P E [b] / Heleomyza kovali [b] / sp. nov. J. Preisler & / M. Tkoč det. 2016 / [yellow label]’; 3 (1 JPLC, 1 NMPC, 1 ZIN, all genitalia prep.): ‘Crimea, Ayu – Teshik 2 Cave / 21.VII.2001 – 13. VI.2002 / A.G. Koval lgt. // P A R A T Y P E [b] / Heleomyza kovali [b] / sp. nov. J. Preisler & / M. Tkoč det. 2016 /

[yellow label]’.

Description. Male. Body length 5.45 mm (holotype), 5.20–5.45 mm (paratypes). Wing length 5.55 mm (holotype), 5.05–5.60 mm (paratypes). Body steel-grey and brownish-yellow to (ochreous) brown and/or yellow, dorsal part of frons and orbital plate reddish.

Head ( Figs 2–4 ) wider than long, extended mouthparts of equal length as the height of head. Frons reddish-brown to yellow in dorsal view, brown to yellow in anterior view, covering 0.4–0.5 of the head width, with small setae denser in lower half of the frons, dorsal part of frons bare. Ocellar triangle large, of grey colour with short setae and two long divergent ocellar setae ( Fig. 3 ), postverticals of medium length and convergent. Two long outer vertical setae, grey coloured median occipital sclerite bare, two clusters of short supracervical setae. Occiput grey, postgena ranging from grey to reddish brown, both with moderate setae, ventral part of postgena with longer setae. Posterior part of orbital plate brown to reddish brown, devoid of small setae, with two long fronto-orbital setae ( Fig. 3 ). Anterior part of orbital plate with small setae continuing to frons, frons yellow to orange-yellow coloured. Face and parafacialia ochreous brown to orange-yellow, devoid of setae. Frontal lunule brown. Vibrissal angle ochreous brown, setose, with two long setae (vibrissa and subvibrissa) and 2–3 shorter setae. Gena ochreous brown to orange-yellow, its dorsal half bare, ventral half with short peristomal setae. Eye of normal size ( Figs 3, 4 ), oval, its longest diameter about 1.25 times as long as shortest. Antenna ( Fig. 5 ) dark brown, with paler scape and pedicel; scape short and conical, with uniserial setae surrounding distal margin; pedicel subtriangular in profile, with microsetae on distal margin and on dorsal part, and with one prominent seta dorsally; 1st flagellomere rounded, lenticular and densely finely microtomentose, its base of brighter colour (but dorsal side is dark). Arista ( Fig. 5 ) long, about 2.5–3 times as long as rest of antenna, with very short, almost indistinct cilia.

Thorax ( Fig. 3 ) steel grey to grey, dorsally completely microsetose, except for scutellum and sutural area. Pleural part of thorax bare, except for proepimeron, proepisternum and katepisternum. Postpronotal lobe with one postpronotal (humeral) seta. Notopleuron with two notopleural setae; one supraalar seta and two postalar setae. Acrostichal setae not differentiated from mesonotal microsetae, only prescutellar pair of medium length; 4 long dorsocentral setae (1 presutural, 3 postsutural). Scutellum devoid of short setae, with only two pairs of long scutellar setae. Proepimeron with very short setae. Anepisternum (mesopleuron) bare and subshining; katepisternum (sternopleuron) setose on dorsal margin (one long seta and 7–8 fine short setae) and with fine long setae at posterodorsal corner. Anepimeron (pteropleuron), laterotergite (metapleuron) and meron (hypopleuron) bare and subshining, steel grey.

Legs brown to dark brown ( Fig. 1 ). All femora and tibiae finely densely setulose with some macrosetae. Fore femur dark brown, thickened, with longer but hair-like setae in posteroventral and posterodorsal rows. Mid femur brown, with one larger posterior preapical seta posterolaterally and numerous short setae anteriorly and ventrally. Hind femur with one long dorsal seta in basal 2/3 of femur length. Tibiae each with 1 long erected dorsal preapical seta. Fore tibia covered with short setulae. Mid tibia shortly setulose and with subapical group of 5 anteroventral setae (3 long and stout, 2 short). Hind tibia with short setulae, two thicker anteroventral apical black setae (one short, one long) and 3–5 subapical posterior brushes of fine golden setae. Fore basitarsus with two basal posteroventral black setae and ventral row of light brown longer setae on basal half. Mid basitarsus with two larger black basal setae ventrally and two ventral rows of short black stout setae. Hind basitarsus and second tarsomere with posterior brushes of golden hairs on entire lenght, additionaly with 3 larger black basal setae on hind basitarsus. Other tarsi simply setose with short and long setae.

Wing ( Fig. 2 ) with normal venation; membrane very lightly brownish tinted and veins pale brown to brown, veins in basal part of wing lighter in colour. Costa with 6–8 strong setae in front of and 14–16 beyond costal break. Wing measurements: width 1.75–2.00 mm, C-index (Cs 3: Cs 4) = 1.6, r-m\dm-cu: dm-cu = 2.88. Haltere ivory yellow, knob not darker than stem.

Abdomen with preabdominal terga broad, extended onto ventral side of abdomen, brown coloured, covered with fine setulae. T1 with longitudinal medial groove, devoid of setulae, T1 otherwise with setulae present, denser laterally. T2–T5 covered with setulae, on posterior margins and laterally with longer, thicker setae; posterior margins of terga darkened. Preabdominal sterna square shaped, light brown coloured, with fine short setae and few medium setae posteriorly on each sternum. Pleural membrane ivory yellow, well visible ventrally. Postabdominal sclerites well sclerotized, brown pigmented; 6th and 7th sterna asymmet- rical and fused together. 8th sternum less asymmetrical, dorsally convex; its basal third bare, the remaining two thirds covered with short setae ( Fig. 6 ).

Genitalia ( Figs 6–8 ) brown coloured with elongate gonostyli. Epandrium convex, semiglobular in lateral view ( Fig. 7 ), with long and medium long setae, mainly on its caudal half. Cerci protruding posteroventrally, partly fused with epandrium ( Fig. 7 ), each cercus with 2 very long apical setae and a number of long fine setulae.Anal fissure higher than wide. Medandrium (= intraepandrial sclerite) not visible. Gonostylus ( Fig. 7 ) elongated, thickening dorsoventrally, almost orthogonally bent to posterior direction (L-shaped) forming a long finger-like apex. Small tubercle, named editum ( Fig. 7 ), with group of short setae ventrally on epandrium. Hypandrium with wide convex lobes of lateral arms ( Fig. 8 ). Aedeagal complex ( Fig. 8 ) with long phallapodeme connected with hypandrium by means of a ventral fulcrum, postgonite with 2 stout setae, pregonite having 2–3 fine setae. Distiphallus long and composed of two thread-like sclerites ( Fig. 8 ). Ejaculatory apodeme normally developed, rod-like, hardly dilated proximally ( Figs 6, 8 ).

Female. Unknown.

Differential diagnosis. Heleomyza kovali sp. nov. differs from other European Heleomyza species by the structure of its male genitalia. The male genitalia of H. kovali are most similar to those of the species H. serrata (Linnaeus, 1758) and H. captiosa ( Gorodkov, 1962) , cf. GORODKOV (1962: 661, as Leria). However, its semiglobular epandrium differs in lateral view from the epandrium of both H. serrata (having ventral part prolonged to form an orthogonal apex) and H. captiosa (having ventral part even longer than in H. serrata and forming a tapered rounded apex). The gonostylus is also of unique shape; it is L-shaped with rather long finger-like projection, in contrast to that of H. serrata , which is shorter, has no projection and is gradually bent. The gonostylus of H. captiosa is more similar to the H. kovali sp. nov., but also different: its basal part is of similar thickness as is the medial part, and it is gradually bent (not L-shaped) and the apical projection is shorter.

Etymology. This new species is named after the collector of three of the paratypes, the Russian cave entomologist Alexander G. Koval.

Biology. The holotype was collected by meat trap in spruce montane forest. Possibly a troglophilous (or trogloxenic) species.

Distribution. Czech Republic, Crimea.

Figures

Fig. 1. Heleomyza kovali sp. nov., male, paratype (Czech Republic, Podyjí NP), lateral view of habitus.

Figs 2–5. Heleomyza kovali sp. nov., male, holotype (Czech Republic, Jizerské hory PLA). 2 – wing; 3 – head and thorax, dorsal view; 4 – head, anterior view; 5 – detail of right antenna, inner lateral view.

Figs 6–8. Heleomyza kovali sp. nov., male genitalia. 6 – paratype (Crimea), last two abdominal segments and genitalia sublaterally; 7 – holotype (Czech Republic, Jizerské hory PLA), genitalia laterally; 8 – paratype (Crimea), aedeagal complex and hypandrium, dorsal view. For abbreviations see page 268.