Cordilura nubilosa Ozerov et Krivosheina, 2020

Ozerov, A. L. & Krivosheina, M. G., 2020, A review of the genus Cordilura Fallén, 1810 (Diptera: Scathophagidae) of Russia, Russian Entomological Journal 29 (4), pp. 439-480 : 461

Cordilura nubilosa Ozerov et Krivosheina , sp.n.

Figs 78–80 .

MATERIAL EXAMINED. Holotype ♂, Russia: Primorsky Krai: Sikhote-Alin’, the top of the Mt. Oblachnaya (43.695ºN 134.199ºE), 3.VII.1962, Kovalev ( ZISP).

DESCRIPTION. Male. Length of body 4.2 mm. Length of wing 4.8 mm.

Head. Frontal vitta and fronto-orbital plate reddish, thinly whitish dusted. Ocellar triangle black. Face, parafacial and gena yellow with whitish reflections. Postcranium black in upper part and yellow in lower third. Setae: 2 orbitals, 2 frontals, 1 ocellar, 1 long inner vertical, 1 outer vertical (approximately 0.5 times as long as inner vertical), 1 postocellar; 1 pair of strong vibrissae present. Scapus and pedicel yellowish. Postpedicel blackish, rounded apically, approximately 2.5 times as long as wide. Arista nearly bare, longest hairs not exceeding greatest diameter of arista. Palpus yellow with a thin apical seta.

Thorax thinly greyish dusted, blackish, only katepisternum and meron yellow. Acrostichals setulose in two rows, dorsocentrals 3+1 (including scapular seta), intra-alars 0+1, supra-alars 1+2, 1 postpronotal, 2 notopleurals, 2 postalars. Proepisternum covered with fine hairs and with 1 seta near ventral margin. Proepimeron with 1–2 setae ventral to spiracle. Anepisternum with a few hairs in posterior half and 2 black setae near posterior margin. Katepisternum with yellow hairs in ventral corner and 1 strong long black seta in posterodorsal corner. Anepimeron bare. Scutellum with a pair of strong discal setae only; apical scutellar setae as setulae.

Legs completely yellow. Fore femur with rows of dorsal and posteroventral setae. Fore tibia with 2 posterodorsal, 2 anterodorsal, 2 posteroventral, 1 dorsal preapical and 1 posterior apical setae. Mid femur with a row of anterior setae and with 1 posterior apical seta. Mid tibia with 2 anterodorsal, 2 posterodorsal, 1 anteroventral setae, and with a ring of apicals. Hind femur with a row of anterodorsal setae and 2 anteroventral setae in apical third. Hind tibia with 1 posterodorsal, 2 anterodorsal, 1 anteroventral, 1 dorsal preapical, and 1 apical anteroventral setae.

Wing tinged with yellowish; veins pale brown. Vein R 1 setulose on apical third of dorsal surface. Calypters, margins of calypters, and halteres yellowish.

Abdomen blackish, thinly greyish dusted. Syntergite 1+2 with 3–4 lateral discal and with a row of marginal setae; tergites 3–6 each with a row of marginal setae. Sternite 4 rectangular, approximately as long as wide. Sternite 5, epandrium and surstyli as in Figs 78–80 .

Female unknown.

COMPARISON. New species is closely related to East Palaearctic species C. amurensis Ozerov, 2007 , but is distinguished from this species by colour of scutum and structure of surstyli. C. amurensis has scutum of thorax reddish yellow and longer surstyli ( Fig. 38 ), undoubtedly curved in median part ( Fig. 37 ). New species has scutum of thorax blackish and surstyli short- er and straight ( Figs 79, 80 ).

DISTRIBUTION. Russia: Primorsky Krai.

Figures

Figs 78–86. Cordilura nubilosa sp.n. (78–80), C. picipes (Meigen) (81–83) and C. picticornis (Loew) (84–86): 78, 81, 84 — male sternite 5; 79, 82, 85 — epandrium and surstyli, lateral view; 80, 83, 86 — same, dorsal view. Рис. 78–86. Cordilura nubilosa sp.n. (78–80), C. picipes (Meigen) (81–83) и C. picticornis (Loew) (84–86): 78, 81, 84 — стернит 5 самца; 79, 82, 85 — Эпандрий и сурстили, сбоку; 80, 83, 86 — то же, сверху.

Figs 33–41. Cordilura albipes (Fallén) (33–35), C. amurensis Ozerov (36–38) and C. atrata (Zetterstedt) (39–41): 33, 36, 39 — male sternite 5; 34, 37, 40 — epandrium and surstyli, lateral view; 35, 38, 41 — same, dorsal view. Рис. 33–41. Cordilura albipes (Fallén) (33–35), C. amurensis Ozerov (36–38) и C. atrata (Zetterstedt) (39–41): 33, 36, 39 — стернит 5 самца; 34, 37, 40 — Эпандрий и сурстили, сбоку; 35, 38, 41 — то же, сверху.