Dolichopus satoi Negrobov, Fursov et Selivanova, 2014

Negrobov, O. P., Fursov, V. N. & Selivanova, O. V., 2014, A New Species Of Dolichopus (Diptera, Dolichopodidae) From Japan, Vestnik Zoologii 48 (5), pp. 471-474 : 471-473

Dolichopus satoi Negrobov, Fursov et Selivanova , sp. n. ( fig. 1–3 )

M a t e r i a l. Holotype, ♂, Japan, Honshu, Nagoya, Shiogama-guchi , Tenpaku-ku , 29.05.1999 (coll. V. Fursov). Type is deposited in the collection of Zoological Institute of Russian Academy of Sciences (Saint-Petersburg).

D i a g n o s i s. In the key to Palaearctic species ( Negrobov et al., 2005) this species runs to D. mediovenus Negrobov , differing from it by the coloration and setation of the hind tarsus, coloration of face and structure of surstyli as given in a short key.

D e s c r i p t i o n. M a l e. Body length: 5.0 mm, wing length: 4.7 mm. Frons bright, shiny green, with bronze tint without pollen around the edges. Face pale yellow, without hairs, not reaching lower margin of eyes, its width at middle barely wider than third antennal segment (1.13: 1). Proboscis dark brown. Palp yellow with light hairs and one black bristle. 1st, 2nd and base of 3rd antennal segment yellow, most part of 3rd segment brown. Third antennal segment long, with pointed apex, its length is greater than its width. Ratio of 3rd antennal segment length to its width and length of arista — 1: 1.75: 4.5. Arista closer to base of dorsal side of 3rd antennal segment, not expanding on top, with short hairs. Postero-ocular bristles light-yellow basally.

Thorax dark green. Mesonotum metallic shiny, bronze-tinged, with a bronze longitudinal stripe, with two bronze spots on each side, pleurae in gray pollen. Propleuron at the bottom with one strong black seta and two groups of small light hairs.

Legs, including coxae, yellow; segments of front and middle tarsus dark, except for most of 1st segments; middle coxa dark in most part; hind coxa black at base; hind tarsus black and apex of hind tibia black. Fore coxa with yellow hairs; all coxae on top with black bristles. Middle and hind femur with one strong antero-apical seta. Fore tibia without long apical-ventral seta, with 2 antero-dorsal, 2 postero-dorsal and 3 short postero-ventral setae. Tarsal segments not expanded. Top of 4th and all 5th segment of fore leg with short spiky hairs. Ratio of length of front tarsus and length of segments of fore tarsus (from 1st to 5th) — 6.4: 3.4: 1.8: 1.3: 0.8: 0.6. Mid tibia with 4 antero-dorsal, 2 postero-dorsal and 2 antero-ventral setae. First segment of mid tarsus with one strong seta on frontal side and small setae on ventral side. Ratio of length of mid tibia to length of mid tarsal segments (from 1st to 5th) — 10.9: 6: 3: 2.13: 1.38: 1.

Рис. 1–3. Dolichopus satoi , sp. n.: 1 — гипопигий; 2 — сурстили; 3 — усик.

Рис. 4–6. Dolichopus mediovenus : 4 — гипопигий; 5 — дорсальная лопасть сурстилей; 6 — вентральная лопасть сурстилей.

Femora without long ventral setae. Hind tibia not thickened, with antero-dorsal, 5 postero-dorsal, 5 strong ventral setae and a number of small ventral setae. First segment of hind tarsus with 3 strong setae and group of small setae on ventral side. Ratio of length of hind tibia to length of segments of hind tarsus (from 1st to 5th) — 9.4: 4.1: 3.2: 2.2:1.4: 0.8. Notum with 2 strong black setae at edge and 2 small setae on sides.

Wing weakly darkened. Costal vein at apex of subcostal vein with oval thickening. Veins R 4+5 and M 1+2 parallel at top. Vein M 1+2 sharply curved in apical part, with rudimentary vein M 2. Ratio of lengths of costal vein sections between R 2+3 and R 4+5 and between R 4+5 and M 1+2 — 1.85: 1. Apical section of M 3+4 1.68× times as long as crossvein dm-cu. Anal lobe well developed. Anal angle obtuse. Calypters yellow with black hairs. Halter yellow.

Abdomen metallic green, shining, with bronze strips on edges of tergites and with silver-white pollen on sides. Apico-ventral surstylus yellow, rostrum shaped, with one strong seta on top, approximately 2× as long as wide. Phallus in apical part without teethshaped ventral process. Cercus yellow, elongated-oval, with black border at edges, much longer than wide, on top with serrated edges and long crescent bristles.

F e m a l e unknown.

E t h y m o l o g y. The species is named in the honor of Dr. Masahiko Sato (Rishiri Town Museum, Hokkaido, Japan), with whom O. P. Negrobov is fruitfully collaborating for a long time in the study of taxonomy of the family Dolichopodidae .

Figures

Fig. 1–3. Dolichopus satoi, sp. n.: 1 — hypopigium; 2 — surstylus; 3 — antenna.