World revision of Iteaphila with unbranched radial vein (Diptera: Empidoidea: Iteaphilidae) Author Sinclair, Bradley J. 0000-0001-6413-1606 bradley.sinclair@canada.ca Author Shamshev, Igor V. 0000-0001-6413-1606 bradley.sinclair@canada.ca text Zootaxa 2021 2021-05-07 4968 1 1 89 journal article 6423 10.11646/zootaxa.4968.1.1 8f948bf9-6e6b-4167-aa50-bf648409d0e5 1175-5326 4745566 09F4CC3C-879C-4FCD-94D5-9ADE4A81EFAC Iteaphila aktruensis sp. nov. ( Figs 59 , 81 ) urn:lsid:zoobank.org:act: A16F3D01-D18D-49E8-81D0-C00C2B3125A2 Type material. HOLOTYPE ♂ , labelled: “2/ 3.vii.2013 (RUS [ Russia ])/ Aktru [ 50°05′N 87°40′E ], stream nr village/ Leg. A. van Eck / 45U 555.38 5547.72”; “ Euthyneura / ♂ / spec./ det. R . v. d. Weele”; “ HOLOTYPE / Iteaphila / aktruensis/ Sinclair & Shamshev [red label]” [postpedicel and stylus lost] ( ZIN ). Additional material examined. RUSSIA . Altai Republic : Same data as holotype ( 2 ♀ , ZIN ). These females appear to represent different species and it is uncertain which is conspecific with the male, given the loss of the male postpedicel . Recognition. This species appears very similar to I. sakhalinensis sp. nov. on the basis of male terminalia, but is distinguished from the latter by the distinctly narrow cercus and postgonite, as well as the long apical section of the phallus ( Fig. 59 ). FIGURES 58–61. Male terminalia of Iteaphila with unbranched R, lateral view. 58, I . subnupta sp. nov. ; 59, I . aktruensis 4+5 sp. nov. ; 60, I . incus sp. nov. ; 61, I . miranda sp. nov. Scale bar = 0.1 mm. Abbreviations: pgt—postgonite; ph—phallus; sur—surstylus. Description. Wing length 3.1 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 with setae lost. Postvertical setae subequal in length with postocular setae, thin; occiput covered with numerous similar setae in lower part. Antenna broken (postpedicel and stylus lost), dark brown; scape subequal in length with globular pedicel, both with short setae. Proboscis partially retracted in head, true length unknown, only apex of palpus visible. Thorax with most setae removed; dark brown in ground-colour, including postpronotal lobe and postalar tubercle, with brown to black setation; scutum viewed dorsally entirely velvety brown, without apparent vittae; meso-pleuron uniformly greyish brown pollinose. Postpronotal lobe with 1 seta. Mesonotal setae mostly lost; acr bi-serial; dc uniserial. Legs, including coxae, almost entirely brownish; knees of fore and midlegs pale; tarsi 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 hairs 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 brownish infuscate, darker about veins; 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) nearly onethird 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. 59 ) concolorous with abdomen, small. Hypandrium with row of long setae, stouter dorsally, horizontal, not upcurved with rounded apex; gonocoxal apodeme short and broad; inner apodeme expanded and flattened, shorter than length of ejaculatory apodeme; postgonite short, strongly arched dorsally, narrowed apically into slender projection. Phallic guide very short, emerging from posterior margin of epandrium, bent nearly at right angles subapically; bent apical section paired with toothed, rounded apical margin. Epandrium not inflated laterally; dorsal bridge very narrow medially; produced distally into slightly dorsally projecting surstylus; apex of surstylus with long, narrow hooked projection medially. Phallus slender, arched beyond epandrium, recurved back between epandrial lamellae, extending to near ventral margin of epandrium; apical well sclerotized with bifid apex; ejaculatory apodeme platelike, rounded, short, not projecting beyond gonocoxal apodeme. Cercus strongly narrow beyond mid-length, nearly subequal to length of epandrium, with broad base, apex rounded, extended well free from epandrium; hypoproct produced into pair of long, slender processes, half length of apical portion of cercus. Female. Unknown. Distribution. Palaearctic: Russia . This species is known only from near Aktru Mountain ( Altay ), Russia ( Fig. 81 ). Etymology. This species is named after the type locality, Aktru.