Iteaphila sakhalinensis, Sinclair & Shamshev, 2021

Sinclair, Bradley J. & Shamshev, Igor V., 2021, World revision of Iteaphila with unbranched radial vein (Diptera: Empidoidea: Iteaphilidae), Zootaxa 4968 (1), pp. 1-89 : 73-74

Iteaphila sakhalinensis sp. nov.

( Figs 70 , 81 )

urn:lsid:zoobank.org:act:7430A097-DAD8-47CA-B724-7709AA8107AD

Type material. HOLOTYPE ♂, labelled [printed in Cyrillic, Russian ]: [ Russia] “Yuzhn. [=Yuzhno] Sakhalinsk [46°57′N 142°44′E],/ o-v [=island] Sakhalin / Violovich”; “na [=on] Caltha/ fasculosa/ 20.v.[1]956 [handwritten]”; “ HOLOTYPE / Iteaphila / sakhalinensis/ Sinclair & Shamshev [red label]” ( ZIN).

Recognition. This species appears very similar to I. aktruensis sp. nov. on the basis of male terminalia, but is distinguished from the latter by a broader cercus and postgonite and shorter apical section of the phallus ( Fig. 70 ).

Description. Wing length 3.2 mm. Male. Head dark brown in ground-colour, with pale brown to black setation, occiput thinly to densely greyish pollinose. Eyes holoptic, with upper ommatidia enlarged. Frons represented by small triangular space just above antennae, bare, greyish pollinose. Ocellar triangle prominent, with 2 pairs of long hair-like setae. Postvertical setae subequal in length with postocular setae, thin; occiput covered with numerous similar setae in lower part. Antenna dark brown; scape short, slightly shorter than globular pedicel, both with short setae; postpedicel broad, more than 4 times longer than basal width, base little expanded, only slightly tapered apically; stylus apparently very short, shorter than width, sensillum-tipped; segment 9 tubular, shorter than width, apical sensillum about as long as segment 9. Proboscis partially retracted in head, true length unknown, only apex of palpus visible.

Thorax dark brown in ground-colour, including postpronotal lobe and postalar tubercle, with brown to black setation; scutum viewed dorsally entirely velvety brown, without vittae; mesopleuron uniformly greyish brown pruinose. Proepisternum with several long setae. Postpronotal lobe with 1 long thin and several shorter setae. Mesonotal setae distinct, thin; acr very short, biserial, lacking on prescutellar depression, distance between rows shorter than length of acr; dc uniserial (with some additional setulae in anterior part), offset from row anteriorly, subequal in length with acr, 2–3 distinct prescutellar dc; 1 ph, 1 presut spal (sometimes with additional setulae), 2–3 npl (with a few additional shorter setae), several psut spal setulae, 1 pal and several short setulae, 6 pairs of sctl.

Legs, including coxae, almost entirely brown. Coxae and trochanters with unmodified hair-like setae. Fore femur with row of short anteroventral hair-like setae and longer setae on posteroventral, dorsal and posterior faces. Fore tibia with row of slightly prominent thin posterodorsal setae. Mid femur with long posteroventral bristly setae along entire length, bearing some moderately long setae on dorsal and posterior faces. Hind femur with long anteroventral and dorsal setae along whole length. Mid and hind tibiae without prominent setae. Tarsomere 1 of mid and hindlegs with pair of rows of stiff ventral setae; tarsomere 5 not flattened on all legs; pulvilli broad, shorter than tarsal claw.

Wing distinctly uniformly brownish infuscate; basal costal seta absent; pterostigma distinct brownish, elliptical, overlapping apex of R 1; anal lobe very prominent, acute. Sc complete; R 2+3 slightly bowed posterior to pterostigma; R 4+5 unbranched; cell dm broad, longer than basal cells, truncate apically; base of M 2 (crossvein) one-fourth length of dm-m, M branches widely separated; dm-m crossvein slightly concave. Apex of cell cua recurved, CuA+CuP long, ending short of wing margin. Halter brown.

Abdomen brown, subshiny, finely brownish grey pollinose, covered with short black setae. Terminalia ( Fig. 70 ) concolorous with abdomen, small. Hypandrium with row of long setae, stouter dorsally, rounded, upcurved apically with rounded, bare apex; gonocoxal apodeme short and slender; inner apodeme expanded and flattened, shorter than ejaculatory apodeme; postgonite short, strongly arched anteriorly, broad with slender, apical extension. Phallic guide short, confined to near apex of hypandrium; apex strongly recurved, divided into pair of lobes; apical lobes well sclerotized. Epandrium not inflated laterally; dorsal bridge very narrow medially; produced distally into broad horizontally projecting surstylus; apex of surstylus with long, narrow hooked projection medially. Phallus slender, arched beyond epandrium, recurved back between epandrial lamellae; apical well sclerotized, with bifid apex; ejaculatory apodeme plate-like, rounded, short, not projecting beyond gonocoxal apodeme. Cercus gradually tapered, three-quarters length of epandrium, broad, with broad base, apex rounded, extended well free from epandrium; hypoproct produced into pair of relatively long, slender processes.

Female. Unknown.

Distribution. Palaearctic: Russia (Sakhalinskaya Province). This species is known only from Sakhalin Island, Russia ( Fig. 81 ).

Etymology. This species is named after the type locality, Sakhalin Island.

Figures

FIGURES 66–70. Male terminalia of Iteaphila with unbranched R. 66, I. oedalina (Zetterstedt), posterior view; 67, same, 4+5 lateral view; 68, I. polygyna (Melander), lateral view; 69, I. recurvata sp. nov., lateral view; 70, I. sakhalinensis sp. nov., lateral view. Scale bar = 0.1 mm. Abbreviations: pgt—postgonite; ph—phallus; sur—surstylus.

FIGURES 79–81. Distribution of Iteaphila with unbranched R 4+5. 79, I. longiphallus sp. nov., I. recurvata sp. nov.; 80, I. falcata Sinclair, I. parastentor sp. nov., I. stentor (Melander); 81, I. atruensis sp. nov., I. gracilis sp. nov., I. kyrgyzstanensis sp. nov., I. sakhalinensis sp. nov., I. spinosa sp. nov.