Orthacheta cornuta ( Loew, 1863 )

Ozerov, A. L. & Krivosheina, M. G., 2015, A review of the genera Cleigastra Macquart, Gonarcticus Becker, Gonatherus Rondani, Hexamitocera Becker, Nanna Strobl, Orthacheta Becker and Spathephilus Becker (Diptera, Scathophagidae) of Russia, Zootaxa 4012 (2), pp. 201-258 : 250

Orthacheta cornuta ( Loew, 1863)

Figs 8 , 166–174 .

cornuta Loew, 1863: 26 (Cordylura) . Type-locality: “English River” ( Canada, Ontario).

fuscipennis Hendel, 1930: 8 ( Orthochaeta ). Type-locality: “Klutchi” ( Russia, Kamchatka Kray).

Remarks. Besides Hendel’s (1930: 8, as fuscipennis) record from Kamchatka, this species was recorded for the Russian Far East by Ozerov & Krivosheina (2014b: 215).

Material examined. Arkhangelsk Oblast: Nar'yan-Mar (67.631761N, 52.985770E), 7.VII.2008, N.E. Vikhrev (2 ♂♂, ZMUM); Kamchatka Kray: Bay Vestnik (51.4823N 157.5301E), 27.VII.1999, A. Leley, S. Storozhenko (1 ♀, ZMUM); Valley of Geysers (ca. 54.43N 160.15E), 12.VIII.1985, V. Zlobin (2 ♂♂, 1 ♀, ZISP); Komi: Schel'yaboj (66.29N 56.45E), 14.VIII.1978, Gorodkov (1 ♂, ZISP); Inta (66.0362N 60.1628E), 5.VIII.1985, Gorodkov (1 ♂, ZISP); Krasnoyarsk Kray: Igarka (67.457N 86.598E), Enisey, 30.VI.1967, Gorodkov (8 ♂♂, ZISP).

Diagnostic description. Body-length 5.0–7.0 mm. Head. Frons usually black in upper part and yellow in lower third or half. Postpedicel approximately 3 times as long as pedicel. Thorax black, grey dusted. Proepisternum with hairs in central part. Katepisternum with 3 strong setae, in ventral corner with yellow setae. Legs yellow, only tarsi darkened. Fore coxae with white hairs. Femora slender. Wing usually distinctly brownish. Abdomen black, greyish dusted. Male sternite 4 rectangular, 2 times as long as wide ( Fig. 169 ). Male sternite 5 as in Fig. 166 . Epandrium, cerci and surstyli as in Figs 167, 168 .

Distribution. Russia ( Fig. 170 ): Arkhangelsk Oblast and Komi (first record for Europe), Kamchatka Kray, Krasnoyarsk Kray, Primorskiy Kray.—North America.

Figures

FIGURES 1 – 8. Nanna flavipes (Fallén) (1, 2, 5, 7), Hexamitocera loxocerata (Fallén) (3), Spathephilus nigriventris (Loew) (4, 6) and Orthacheta cornuta (Loew) (8): 1 — thorax, lateral view; 2 — proepisternum; 3 — head, lateral view; 4, 5 — antenna, lateral view; 6 – 8 — scutellum. Figures 4 – 7 after Ozerov (2010 e, Figures 10 – 13).

FIGURES 163 – 170. Nanna tibiella (Zetterstedt) (163 – 165) and Orthacheta cornuta (Loew) (166 – 170): 163 — end of female abdomen, ventral view; 164 — same, dorsal view; 165 — same, lateral view; 166 — male sternite 5; 167 — epandrium, cerci and surstyli, lateral view; 168 — same, dorsal view; 169 — male sternite 4; 170 — distribution map.

FIGURES 171 – 178. Orthacheta cornuta (Loew) (171 – 174) and Orthacheta pilosa (Zetterstedt) (175 – 178): 171 — end of female abdomen, ventral view; 173 — same, dorsal view; 174 — same, lateral view; 174 — female abdominal sternite 7; 175 — epandrium, cerci and surstyli, lateral view; 176 — same, dorsal view; 177 — antenna, lateral view; 178 — distribution map.