Ventrops vikhrevi, Cerretti & Ziegler & Pape, 2015

Cerretti, Pierfilippo, Ziegler, Joachim & Pape, Thomas, 2015, A new Ventrops (Diptera: Rhinophoridae) from Ethiopia, African Invertebrates 56 (3), pp. 579-579 : 580-582

Ventrops vikhrevi sp. n.

Fig. 1

Etymology: This species name is a patronym for Nikita Vikhrev, who has provided invaluable specimens from his collecting for our studies, including the species newly described here.

Diagnosis: The new species V. vikhrevi sp. n. is characterised by (i) compound eye large but not enormously developed so that both gena and parafacial are distinct; (ii) posterior eye margin not indented; (iii) parafacial setose ( Fig. 1A ); (iv) lateral vertical seta well differentiated from postocular row; (v) basicosta yellow; (vi) wing cell r 4+5 open ( Fig. 1B ); (vii) cercus not shortened, 0.8× as long as surstylus ( Fig. 1E, F ); and (viii) median process of ventral sclerotisation of distiphallus very long, extending beyond thE acROphallus, asYmmEtRical aNd apicallY bRaNchiNg iNtO sEVERal, lONg, fiNgER-shapEd sclerites ( Fig. 1D ).

Description (measurements in square brackets refer to the holotype):

Body length. 5.1–5.3[5.3] mm.

Coloration. Head shiny black covered with light brownish microtomentum only on genal dilation. Palpus blackish brown. Thorax black, covered with weak brownish grey REflEctiNg micROtOmENtum, lEgs aNd abdOmEN shiNY blacK. HaltER with YEllOw stalK aNd black knob. Upper and lower calypteres whitish. Tegula black. Basicosta yellow. Wing membrane brownish anteriorly and around veins.

Head ( Fig. 1A ). Arista thickened only proximally, covered with microtrichia which are shorter than maximum proximal diameter of arista. First and second aristomeres not elongated. Postpedicel sub-ovoid, about as long as pedicel. Frons at its narrowest point 1.25–1.43[1.43]× as wide as compound eye in dorsal view. Ocellar seta well developed, proclinate. One or 2 pairs of lateroclinate setae, behind ocellar triangle, between ocellar and postocellar setae with variable size. Medial vertical seta strong, reclinate. Lateral vertical seta well developed. Usually 3 to 4 strong proclinate orbital setae, the holotype has on the right side only 2 setae. Five to 8 frontal setae (of different thickness and length) descending anteroventrally to level of proximal edge of pedicel (or slightly above). Parafacial with a row of stout, short setulae along its whole length. Parafacial at its narrowest point (i.e. true width, not in strict lateral view), [0.8]0.8–1.0× as wide as postpedicel. Face and lower facial margin not visible in lateral view. Vibrissa well developed. Vibrissal angle receding. Facial ridge strongly concave, with 3 decumbent setulae above vibrissa. Genal dilation well developed, covered with robust setulae. Gena iN pROfilE abOut 0.25–0.35[0.30]× as high as cOmpOuNd EYE. POstOculaR sEtaE shORt. Occiput slightly convex, covered with black setulae. Prementum stubby, not longer than wide. Palpus slightly clavate with some setulae on distal half.

Thorax. Prosternum and proepisternal depression bare.Ventral proepimeral seta oriented anteroventrally. Two or 3 postpronotal setae arranged in a straight line. One pair of prescutellar acrostichal setae, 2 + 3 dorsocentral setae, 0 + 2 intra-alar setae and 1 + 3 supRa-alaR sEtaE (fiRst aNd thiRd pOstsutuRal supRa-alaR sEtaE VERY shORt, sEcONd ONE enormous); 1 posthumeral seta, 2 well-developed notopleural setae. Anatergite bare. Two upper katepisternal setae (posterior one clearly longer), plus 3–4 smaller additional setulae and a tuft of setulae in the lower part. One strong and 1–4 short anepimeral setae. Katepimeron bare or with 1 small seta anteriorly. Scutellum with 2 pairs of strong marginal setae (apicals and subapicals); basal pair absent or barely distinguishable (i.e. at most ¼ the length of subapical setae). Subapicals robust and slightly divergent; apical pair crossed and horizontal, approx. ¾ as long as subapical setae. One pair of discal scutellar setae, in subapical position.

Wing ( Fig. 1B ). Costal spine well differentiated. Base of R 4+5 with 2–3 relatively long setulae dorsally. Bend of M widely obtuse. Section of M between dm-cu and bend of M about 1.5× as long as section between dm-cu and r-m. Cell r 4+5 open.

Abdomen. Mid-dORsal dEpREssiON ON sYNtERgitE 1+2 cONfiNEd tO aNtERiOR ⅓ Of that segment. Syntergite 1+2 with 1 pair of median marginal setae; tergite 3 with 1 pair of erect median marginal setae. Tergite 4 with a complete row of marginal setae; tergite 5 with a row of marginal setae (median pair erect).

Male terminalia ( Fig. 1C–F ). Sternite 5 with a deep posterior median notch. Tergite 6 uNmOdifiEd, baRE. CONNEctiON bEtwEEN tERgitE 6 aNd sYNtERgOstERNitE 7+8 mEmbRaNOus. Sternite 6 asymmetrical, articulated with segment 7+8 on left side, and attached to it by a membrane on its right side. Cerci , in posterior view, narrow and relatively long, not fusEd mEdiallY. BacillifORm sclERitEs flattENEd dORsO-VENtRallY aNd cONVERgiNg mEdiallY. SuRstYlus wEll dEVElOpEd, lONgER thaN cERcus. BacillifORm sclERitE fiRmlY fusEd tO basE Of surstylus. Articulation between surstylus and epandrium membranous. Intermedium not fused to pregonites. Pregonite lobe-like, gently bent forward, with 2 or 3 setulae along posterior margin. Postgonite subtriangular in shape, apically bent forward; submedian anterior seta of postgonite present. Postgonal apodeme present. Epiphallus strong, with simple tip (i.e. not sagitally bilobed). Extension of dorsal sclerite of distiphallus entirely fused medially. Median process of ventral sclerotisation of distiphallus very long, extending beyond acrophallus, asymmetrical and apically branching into several, long, fiNgER-shapEd sclERitEs ( Fig. 1D ). DORsal sclEROtisatiON Of acROphallus sEmi-cYliNdRical, open ventrally. Distiphallus with long and pointed, scale-like spinulae latero-ventrally. HOlOtYpE ♂, PaRatYpEs 2♂: ETHIOPIA: Amhara, Zengena L. / 2530 m, 10.910N 36.965E / 02.VIII.2012 N. Vikhrev. Holotype: The second author added a label printed on red paper: “ HOLOTYPUS / Ventrops / vikhrevi / Cerretti, Ziegler & Pape 2014 ”. The holotype was deposited in ZMUM . Paratypes: Both specimens are labelled with “ PARATYPUS / Ventrops / vikhrevi / Cerretti, Ziegler & Pape 2014 ” (printed on red paper). One specimen was deposited in MZUR , the other in ZMHB.

Figures

Fig. 1.Ventrops vikhrevi sp. N.(paRatYpE ♂): (A) hEad iN latERal ViEw; (B) Right wiNg iN dORsal ViEw;(C) lEft pregonite and postgonite in lateral view; (D) distiphallus in lateral view; (E) epandrial complex in posterior view; (F) epandrial complex in lateral view. Scale bars (E, F) = 200 µm.