Sciapus basarukini Grichanov et Selivanova, 2022

Grichanov, I. Ya. & Selivanova, O. O., 2022, The long-legged flies (Diptera: Dolichopodidae) from Kurile Islands, with description of a new species of the genus Sciapus Zeller, 1842, Far Eastern Entomologist 445, pp. 7-24 : 18-20

Sciapus basarukini Grichanov et Selivanova , sp. n.

http://zoobank.org/References/ D853061A-FE2B-4418-AAE7-7019371DBA6E

Figs 1–6

TYPE MATERIAL. Holotype – ♂, Russia: Kuriles , Kunashir Island, Alekhino, 13–16.VIII

1988, leg. A.M. Basarukin ( ZIN).

DESCRIPTION. MALE. Head: as wide as high; frons shining bluish green, weakly grey pollinose; 1 short front vertical bristle, half as long as postvertical, located close to latter bristle;

pair of strong black oculars; 1 long black postvertical; face somewhat bulging, weakly shining under antennae, white pollinose, under antennae 4 times wider than postpedicel height; clypeus densely white pollinose, adjacent to eyes; proboscis brown; palpus light brown, with black seta and white hairs; antenna yellow; pedicel with short setae; postpedicel about as long as high, haired; stylus brown-black, dorsal, shortly haired, 2.5 times longer than antennomeres combined; length (mm) of scape, pedicel, postpedicel, stylus (segments 1 and 2), 0.08/0.06/

0.07/0.06/0.67; upper 3–5 postocular setae black, lateral and lower postoculars white.

Thorax: mesonotum shining bluish green, with black setae; pleura black-green, grey pollinose; five dorsocentrals decreasing in length anteriorly; acrostichals absent; scutellum with

2 strong setae (broken).

Legs: with fore tarsomeres 3–5, mid and hind tarsi broken; coxae and other podomeres yellow; coxae with yellow setae and hairs; fore coxa with hairs anteriorly and 3 apical setae;

fore femur with 1–2 ventral light setae at base, at most as long as femur height; fore tibia and basitarsus without distinct setae; mid femur with minute ventral white hairs, with anterior and posterior rows of elongate semierect setulae on distal half; no strong anterior preapical seta; mid tibia with 1 anterodorsal seta at base, with rows of erect setulae on distal half; hind femur with strong anterior preapical seta (broken); hind tibia with 4–5 dorsal setae. Fore coxa,

femur, tibia and tarsomere (first to second) length ratio (mm): 0.75/1.43/1.53/1.46/0.51; mid femur and tibia length ratio (mm): 1.4/2.84; hind femur and tibia length ratio (mm): 1.93/2.75.

Wing: hyaline; costa straight; ratio of part of costa between R 2+3 and R 4+5 to that between

R 4+5 and M 1: 0.52/0.1; crossvein dm-m straight; M 2 foldlike, M 4 well developed; anal lobe narrow; anal angle right; length ratio of dm-m to distal part of M 1+2 (fork-handle) to distal part of M 4: 0.48/0.37/0.61 (in mm); lower calypter with yellow cilia; halter yellow.

Abdomen: shining greenish-blue, black along sutures, with mainly light setae; sterna dark;

hypopygium black with light brown appendages; segment 7 short; segment 8 large, covered with light hairs.

Hypopygium with long simple phallosome; epandrial lobe finger-like, with 2 long setae at apex; surstylus as long as cercus, with curved dorsal and simple ventral short processes at apex; ventral process of surstylus with short simple and 2 long undulate flattened apical setae;

cerci fused at base, with relatively long light hairs and black setae on basal part, with reduced basoventral projection (organ X) covered with short setae; distoventral projection of cercus free, with ventral fringe of strong flattened bristles and 1 long undulate flattened apical seta.

MEASUREMENTS (mm). Body length: 5.0, wing length: 4.3, wing width: 1.4, antenna length: 0.9.

DIAGNOSIS. The new species keys to Sciapus incognitus Negrobov et Shamshev, 1986

(Grichanov, Negrobov, 2014) described from Primorsky Krai and is very similar to the latter

(Negrobov, Shamshev, 1986). Sciapus basarukini sp. n. differs in distoventral projection of na; 3 – mid tibia, distal half; 4 – wing; 5 – hypopygium, lateral view, dry; 6 – cerci, dorsal view, dry; 7, 8 – S. incognitus Negrobov et Shamshev, 1986 (paratype): 7 – hypopygium,

lateral view, after macertion; 8 – surstylus, lateral view.

cercus with ventral fringe of strong flattened bristles and presence of long undulate flattened apical seta; ventral process of surstylus with two long undulate flattened apical setae ( Fig. 5 ).

Sciapus incognitus male has only short simple setae on apex of cercus and surstylus ( Figs 7, 8 ).

Mid tarsus of this species bears a row of anterodorsal setae. Mid tarsi of S. basarukini sp. n.

holotype are broken, but its mid tibia is covered with rows of erect setulae on distal half

( Fig. 3 ); we suggest that its mid tarsus is also covered with erect setulae, such as mid tarsi of similar European S. longulus (Fallén, 1823) , S. euchromus (Loew, 1857) and S. laetus (Meigen,

1838) males (Grichanov, Negrobov, 2014).

ETYMOLOGY. The name of the new species is dedicated to the collector of the holotype,

Russian zoologist Anatolii Mikhailovich Basarukin (1952–1995).

SPECIES EXCLUDED FROM THE FAUNA OF KURILE ISLANDS

Figures

Figs 1–8. Sciapus spp.: 1–6 – S. basarukini sp. n., holotype, male: 1 – habitus; 2 – anten-