Scathophaga incompleta, Ozerov & Krivosheina, 2020

Ozerov, A. L. & Krivosheina, M. G., 2020, To the taxonomy of the genus Scathophaga Meigen, 1803 (Diptera: Scathophagidae) with description of a new species, Russian Entomological Journal 29 (2), pp. 227-231 : 228-231

Scathophaga incompleta sp.n.

Figs 8–13 .

MATERIAL. Holotype ♂, Russia: Kalmykia, Priyutnoe env. (46.1ºN 43.5ºE), 2–3. V .2013 , N. Vikhrev ( ZMUM). Paratypes: same labels (9 ♂♂, 9 ♀♀, ZMUM); Russia: Crimea, Ai-Petri (44.45ºN 34.05ºE) , 1170 m, 28.IX.2015, N. Vikhrev (1 ♂, ZMUM); Crimea, Kerch env. (45.2ºN 36.1ºE) , 26.IV.2014, N. Vikhrev (3 ♂♂, ZMUM); Crimea, Crimea Nature reserve (ca. 44.666ºN 34.238ºE) , 24.VII.1936, V . Geptner (1 ♂, ZISP); Crimea, Dzhankoy (45.713ºN 34.396ºE) , 19. V .1963 , Gorodkov (3 ♂♂, ZMUM); Adygea, Lagonaki (44.050ºN 40.018ºE) , 1830 m, 20–23. VI .2009, K. Tomkovich (1 ♂, ZMUM); Azerbaijan: Ceyranbatan reservoir (ca. 40.536ºN 49.664ºE) , 17.X.1985, Nartshuk (2 ♂♂, ZISP) .

DESCRIPTION. Male, female. Length of body 5.8– 6. 6 mm. Length of wing 5.6–7.0 mm.

Head. Frontal vitta yellow, matt; fronto-orbital plate blackish, densely pale grey dusted, ocellar triangle blackish. Face and gena yellow, densely whitish dusted. Postcranium blackish, densely pale grey dusted. Setae: 2–3 orbitals, 2–4 frontals, 1 ocellar, 1 postocellar, 1 inner vertical, 1 outer vertical; 1 pair of strong vibrissae and 2 pairs of subvibrissae present. Postcranium covered with white hairs in lower half. Antenna black; postpedicel about twice as long as wide. Arista black, bare. Palpus yellow.

Thorax black, densely pale grey dusted; scutum with a double brownish line down the middle, and an obscure one on each side. Acrostichals in two rows, not differentiated from the other hairs on scutum, 2 postpronotals, 2 notopleurals, 1+2 supra-alars, 1+(1–2) intra-alars (posterior postsutural intra-alar seta small, about 0.5 times as long as anterior one or absent) ( Fig. 8 ), 2 postalars and 2+3 dorsocentrals. Proepisternum centrally and ventrally with whitish hairs, without strong setae ventrally. Proepimeron with whitish hairs. Anepisternum covered with hairs completely and with 2–3 strong setae along posterior margin. Katepisternum covered with hairs completely, covered with long whitish hairs posteriorly and with one strong seta in posterodorsal corner. Postmetacoxal bridge absent. Scutellum greyish dusted, with a pair of strong basal scutellar and a pair of strong apical scutellar setae.

Legs. All coxae black, greyish dusted. All femora greyish dusted, black, except yellow apex: 1/ 4 in mid femur and 1/5–1/ 6 in fore and hind femora. All tibiae and tarsi yellow. Fore femur with whitish hairs, longer ventrally, with 4–5 dorsal setulae in apical third. Fore tibia with 2–3 dorsal, 3–4 posterodorsal, 1–2 posterior, 1 preapical posterodorsal, 1 apical posteroventral, 1 apical posterior setae. Mid femur with a row of anterodorsal setae, with 1 preapical posterodorsal and 1 preapical posterior setae. Mid tibia with 1–2 anterodorsal, 1–2 posterodorsal, 2 posterior (thin), 1 ventral (strong in female) setae, also with a ring of apicals. Hind femur with a row of dorsal/anterodorsal setae. Hind tibia with 2–3 posterodorsal, 2–3 anterodorsal, 1 preapical dorsal, 1 preapical anterodorsal and 1 apical anteroventral setae.

Wing clear, veins brownish. Vein R 1 bare. Calypters, margins of calypters, and halteres yellowish.

Abdomen black, densely pale grey dusted, covered with whitish hairs. Tergites 2–5 in male and tergiters 2–6 in female each with a row of marginal setae.

Male sternite 4 almost twice as long as wide ( Fig. 9 ). Male sternite 5 with moderately long and narrow lobes, with a small projection medially between lobes ( Fig. 10 ). Cercal plate longer than surstyli and narrowing to a slender incurved tip ( Figs 12, 13 ). Aedeagus as in Fig. 11 .

COMPARISON. The new species is similar to S. decipiens (Haliday) and S. obscura (Fallén, 1819) by the structure of cercal plate which is longer than surstylus and narrowing to a slender incurved tip.

In S. obscura intra-alar setae absent, often only one postrponotal seta present. Both the new species and S. decipiens have intra-alar setae and always with two postrponotal setae. The distinctions between S. incompleta and S. decipiens are the following: S. decipiens with two strong postsutural intra-alar setae ( Fig. 2 ), S. incompleta with slender posterior postsutural intra-alar seta or without it ( Fig. 8 ). The differences present in the structure of male aedeagus (compare Figs 5 , 11 ), cercal plate (compare Figs 6,7 and 12,13) and male sternite 5 (compare Figs 4 , 10 ).

DISTRIBUTION. Azerbaijan, Russia (Adygea, Crimea, Kalmykia).

Acknowledgements. We are very grateful to Dr. Luca Bartolozzi (MZLS) for the loan of male syntype of Scatina fluvialis for study, Dr. Adrian C. Pont (UMO) for the loan of male syntype of Scatina fluvialis and males of Scathophaga decipiens for study, and for great help in labels’ decryption, Mr. Simon Hinkley (NMV) for the photo of syntype of Scathophaga decipiens .

The work was conducted within the research project of ZMUM No AAAA-A16-116021660077-3 (A.L. Ozerov) and partly supported by the Program No41 “Biodiversity” (M.G. Krivosheina).

Figures

Figs 8–13. Scathophaga incompleta sp.n., ♂: 8 — thorax, lateral view; 9 — sternite 4; 10 — sternite 5; 11 — aedeagus, lateral view; 12 — epandrium, cercal plate and surstyli, lateral view; 13 — same, dorsal view. Рис. 8–13. Scathophaga incompleta sp.n., ♂: 8 — грудь, сбоку; 9 — стернит 4; 10 — стернит 5; 11 — Эдеагус, сбоку; 12 — Эпандрий, церки и сурстили, сбоку; 13 — то же, сверху.

Figs 1–7. Scathophaga decipiens (Haliday), ♂: 1 — syntype label of S. decipiens from NMV (photo by Simon Hinkley); 2 — thorax, lateral view; 3 — sternite 4; 4 — sternite 5; 5 — aedeagus, lateral view; 6 — epandrium, cercal plate and surstyli, lateral view; 7 — same, dorsal view. Рис. 1–7. Scathophaga decipiens (Haliday), ♂: 1 — Этикетка синтипа S. decipiens иЗ NMV (фото Simon Hinkley); 2 — грудь, сбоку; 3 — стернит 4; 4 — стернит 5; 5 — Эдеагус, сбоку; 6 — Эпандрий, церки и сурстили, сбоку; 7 — то же, сверху.