Iteaphila brooksi, 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 : 36-38

Iteaphila brooksi sp. nov.

( Figs 41 , 50 )

urn:lsid:zoobank.org:act:8D4DCB0E-E26E-4839-B25D-76E065704E6F

Type material. HOLOTYPE ♂, labelled: “USA: CO: Gennison Co., trib./ of Cimmaron River , 9590 ft,/ 38°10′56″N 107°33′25″W,/ 20.vi.2017, S.E. Brooks,/ CNC 85496”; “ HOLOTYPE / Iteaphila / brooksi/ Sinclair & Shamshev [red label]” ( CNC) . PARATYPES: CANADA. British Columbia: Glacier NP , Rogers Pass [51°16′35″N 117°30′25″W], creek margin, 30.vi.1968, W.W. Wirth (1 ♂, USNM); Kootenay NP [50°52′59″N 116°02′57″W], Daer-Pittas Aspen Control 1, 3–17.2000, MT , G. Gareau (1 ♂, CNC) ; same data except, 2–16.vii.2000 (1 ♀, CNC) ; same data except, Control 2, 17.vi.–2.vii.2000 (2 ♀, CNC) ; same data except, Aspen Burn 2, 2–9.vi.2000 (1 ♀, CNC) . USA. Colorado: same data as holotype (1 ♂, CNC); San Juan Co., E. Fork Sig Ck, 10200 ft, 37°39′10″N 107°51′57″W, 18.vi.2017, JMC (2 ♂, CNC) . Oregon: Crook Co., Ochoco NF, along Kyle Ck, 44°21′56″N 120°22′5″W, 19.iv.–12.vii.2017, MT065 , S. Fitzgerald (1 ♂, CNC) .

Recognition. This species is distinguished from other species by the greatly enlarged ejaculatory apodeme of the male terminalia, dorsally projecting surstylus and subtriangular cercus ( Fig. 41 ).

Description. Wing length 3.7–4.6 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 rather narrow, more than 3 times longer than basal width, base somewhat expanded and smoothly tapered; stylus ca 3 times longer than wide, sensillum-tipped; segment 9 tubular, 2–3 times longer than wide, apical sensillum about as long as segment 9. Proboscis medium-length, projected obliquely; labium slightly shorter than head height; palpus projected parallel to labrum, slightly shorter than labrum.

Thorax dark brown in ground-colour with posterior part of postpronotal lobe and postalar tubercle paler, with brown to black setation; scutum viewed dorsally entirely velvety brown, slightly matt, with 2 indistinct paler vittae between acr and dc setae; viewed anteriorly densely brown pruinose, with 2 indistinct darker vittae; mesopleuron uniformly greyish brown pollinose. Proepisternum with a few setae. Postpronotal lobe with 1 long thin and several shorter setae. Mesonotal setae distinct, thin; acr very short, 4-serial, arranged in 2 pairs of closely spaced irregular rows, lacking on prescutellar depression, distance between paired 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), 3–4 npl (with a few additional shorter setae), several psut spal setulae, 1 pal and several short setulae, 6–8 pairs of sctl.

Legs, including coxae, almost entirely brownish; knees and tibiae of fore and mid legs yellowish, 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 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 often slightly bowed posterior to pterostigma; R 4+5 unbranched; cell dm broad, longer than basal cells, truncate apically; base of M 2 (crossvein) more than one-third 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 long black setae; lateral margin of sternites 1 and 2 with white longitudinal membranous patch; apex of abdomen distorted in dried specimens due to enlarged ejaculatory apodeme. Terminalia ( Fig. 41 ) concolorous with abdomen, enlarged and directed dorsally. Hypandrium with row of long setae, rounded, upcurved apically with rounded, slightly expanded apex; gonocoxal apodeme long and slender; inner apodeme expanded and flattened, subequal in length with ejaculatory apodeme; postgonite long, arched, produced into flattened apical plate. Phallic guide extended distinctly beyond epandrium, parallel with phallus and bent greater than right angles subapically; bent apical section paired with jagged or toothed surface apically; apex rounded. Epandrium not inflated laterally; dorsal bridge very narrow medially; produced distally into broad dorsally projecting surstylus; apex of surstylus with short, partially hooked projection medially. Phallus slender, arched beyond epandrium, bent nearly at right angles subapically; apical section not tapered, narrower than phallic guide; ejaculatory apodeme plate-like, rounded, greatly prolonged anteriorly, twice length of gonocoxal apodeme. Cercus tapered, less than half length of epandrium, triangular, with broad base, apex rounded, extended well free from epandrium; hypoproct produced into pair of long, slender processes, subequal in length with cercus.

Female. Similar to male, except as follows:Eyes dichoptic; ommatidia equally small.Frons very broad, somewhat widened toward ocellar tubercle, subshiny, finely brownish grey pollinose, with marginal setulae. Scutellum usually with 5–6 pairs of setae. Legs, including coxae, somewhat paler than male with reduced chaetotaxy. Abdomen somewhat paler with shorter, less prominent setae. Cercus brownish, long, slender, covered with dark setae.

Distribution. Nearctic: Canada (British Columbia), USA (Colorado, Oregon). This species appears mostly confined to the Rocky Mountains of North America ( Fig. 50 ).

Etymology. This species is named in honour of the collector of the holotype, Scott E. Brooks (Ottawa, Canada), a dedicated expert on Dolichopodidae s.lat. and other Empidoidea.

Remarks. This species shares with the Russian species, I. gracilis sp. nov., a greatly enlarged ejaculatory apodeme.

Figures

FIGURES 41–44. Male terminalia of Iteaphila with unbranched R 4+5, lateral view. 41, I. brooksi sp. nov.; 42, I. dichoptica sp. nov.; 43, I. flavipilosa (Coquillett); 44, I. glabricula sp. nov. Scale bar = 0.1 mm.Abbreviations: ej apod—ejaculatory apodeme; goncx apod—gonocoxal apodeme; pgt—postgonite; ph—phallus; ph gd—phallic guide.

FIGURES 49–52. Distribution of Iteaphila with unbranched R. 49, I. arnaudi sp. nov., I. bayarea sp. nov., I. grandis sp. 4+5 nov., I. sierrensis sp. nov.; 50, I. brooksi sp. nov., I. lolo sp. nov.; 51, I. flavipilosa (Coquillett); 52, I. glabricula sp. nov.