Rhamphomyia (Pararhamphomyia) biflexata, Bartak, Miroslav & Kubik, Stepan, 2015

Bartak, Miroslav & Kubik, Stepan, 2015, Palaearctic species of Rhamphomyia (Pararhamphomyia) anfractuosa group (Diptera, Empididae), ZooKeys 514, pp. 111-127 : 113

Taxon classification Animalia Diptera Empididae

Rhamphomyia (Pararhamphomyia) biflexata sp. n. Figs 2, 9, 14

Type material.

HOLOTYPE male, Russia, Amurskaja oblast, g. (= city) Zeja, 8.vii.1981, A. Shatalkin, deposited in ZMMU; paratype: 1 male, same data as holotype (CULSP).

Diagnosis.

Species of the subgenus Pararhamphomyia with pair of long thumb-like dorsomarginal processes on tergite 6, lustrous abdomen, uniserial dorsocentrals and two outgoing loops of the phallus.

Etymology.

The species epithet stresses two outgoing loops on the phallus.

Description.

Male. Head holoptic, facets in dorsal third of eye enlarged. Frons blackish brown, light grey microtrichose, without setae. Ocellar setae less than half as long as frons, black, ocellar triangle without additional setae. Face blackish brown, light grey microtrichose dorsally and broadly lustrous in ventral third, 0.28 mm broad ventrally and 0.32 mm long, bare. Occiput blackish brown, microtrichose, sparsely black setose, setae rather thick and short, ventrally longer and finer. Antenna black, basal segment brown, length of antennal segments = 11: 12: 40: 19, setae on basal two segments up to 0.10 mm long. Labrum brown, lustrous, slightly longer than head is high. Palpus brown, short, covered with several short setae and one strong preapical seta (0.25 mm long). Gena narrow and lustrous, clypeus lustrous.

Thorax brownish-black, light grey microtrichose (without brownish-yellow tinge), darker stripes below rows of acrostichals and dorsocentrals scarcely visible. All setae black. Chaetotaxy: proepisternum with about 10 setae, both propleural depression and prosternum bare; acrostichals damaged but probably irregularly biserial and short; 8 uniserial dorsocentrals, 0.20 mm long in middle of rows, ending in 2 prescutellars, 1 short intrahumeral, 1 strong posthumeral; postpronotum with 1 strong seta and about 8-10 smaller setae; 3-4 notopleurals (1-2 setae on anterior part of notopleuron); 1 supraalar and 1 prealar; 1 long and 1 shorter postalar; 3 pairs of scutellars (outer pair short); laterotergite with black setae.

Legs brown, lustrous, black setose. Coxae blackish-brown, microtrichose (only hind coxa with lustrous spot anteriorly near base), black setose. One long seta in posteroapical comb of hind tibia. Fore femur with fine anteroventral setae 1/3 as long as long as depth of femur, dorsal setae shorter, posteroventrals almost absent. Fore tibia with 4 posterodorsal setae slightly longer than width of tibia, ventral and anterodorsal setae short. Mid femur with two rows of spiny setae ventrally, anteroventrals half as long as depth of femur, posteroventrals longer than depth of femur, other setae short. Mid tibia with two rows of setae dorsally nearly 2 × longer than width of tibia (each row consists of 3-4 setae including preapicals), two rows of ventral setae about as long as width of tibia. Hind femur (Fig. 14) with row of fine anteroventrals shorter than depth of femur, posteroventrals equally fine and irregularly arranged. Hind tibia with 5-6 pairs of antero- and posterodorsal setae 1.5 × longer than width of tibia, ventral setae short. Basal tarsomeres of fore and mid legs thin and short setose, with several short ventral spines. Basal tarsomere of hind leg thin, with several setae dorsally 2 × longer than diameter of tarsomere and with several ventral spines slightly longer than diameter of tarsomere.

Wing clear to light brownish, stigma slightly darker, veins brown, anal vein almost complete. Costal seta strong and long (several other setae between costal seta and wing base relatively strong and long), axillary angle acute. Measurements: M2/d = 1.3, CuA1 ratio = 1.6-1.7, lw/ww = 2.5-3.1. Halter yellow, calypter yellow with dark fringes.

Abdomen brown, lustrous (only segment 1 and part of segment 7 microtrichose as well as tips of thumb-like processes). All setae dark. Hind marginal setae on sides of tergites 2-4 nearly as long as their corresponding segments (discal setae shorter), on segments 5-6 shorter (but still slightly longer than discal setae), segment 7 very short setose. Dorsum of abdomen with short setae. Tergite 6 (Fig. 2) with two thumb-like processes on dorsal hind side; tergite 8 fused with sternite. Phallus (Fig. 9) with two outgoing loops; hypandrium membranose on posterior part (this part covers only part of ventral “ciliation” of phallus); phallus with hair-like “ciliation” ventrobasally and not much produced basal bulge.

Length: Body 5.5 mm, wing 5.5 mm.

Female. Unknown.

Remarks.

Rhamphomyia (Pararhamphomyia) biflexata sp. n. may be easily identified according to the key. It is the only species with long dorsomarginal processes on tergite 6 (similarly as Rhamphomyia shatalkini ) and simultaneously with two outgoing loops on phallus. Female is unknown with certainty, see also Remarks under Rhamphomyia shatalkini sp. n.

Distribution.

Russia (Far East).

Dates of occurrence.

July.