Iteaphila tribulosa, 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: 21-23

publication ID

publication LSID


persistent identifier

taxon LSID

treatment provided by


scientific name

Iteaphila tribulosa

sp. nov.

Iteaphila tribulosa   sp. nov.

( Figs 24–26 View FIGURES 21–25 View FIGURES 26–28 )

Type material. HOLOTYPE ♂, labelled: “Canada. BC: Manning/ Provincial Park,/ Strawberry Flats 49°4′0″N / 120°53′0″ 1651m / Boudreault &/ Goulet CNC315765 View Materials ”; “ HOLOTYPE / Iteaphila   / tribulosa/ Sinclair & Shamshev [red label]” ( CNC)   . PARATYPES: CANADA. British Columbia: Manning PP; Dry Ridge [49°04′45″N 120°46′08″W], summit, 1830 m,, S.G. Cannings (1 ♂, UBCZ); GoogleMaps   Mt.Thornhill [54°30′44″N 128°32′18″W], nr Terrace,, JGC, GES (3 ♂, CNC) GoogleMaps   . USA. Washington: Mt. Rainer [46°51′N 121°45′W], 5–6000 ft, 4.vii.1934, O. Bryant (1 ♂, 2 ♀, CAS) GoogleMaps   .

Recognition. This long setose species is distinguished from other species by a distinctively shaped epandrium, with a deep subapical ventral notch and rounded ventral expansion, straight phallus and apex of the hypandrium forked with spine-like lateral projections ( Figs 24, 25 View FIGURES 21–25 ).

Description. Wing length 3.5–3.7 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 to postocular setae, thin; occiput covered with numerous similar setae in lower part, brown posterior to mouthparts. Antenna dark brown; scape subequal in length with globular pedicel, both with short setae; postpedicel rather narrow, nearly 3 times longer than basal width, base distinctly expanded and parallel-sided, tapered at apex; stylus ca 2–3 times longer than wide, sensillum-tipped; segment 9 tubular, 2 times longer than wide, apical sensillum slightly shorter than length of segment 9. Proboscis partially retracted in head, true length unknown, projected obliquely; palpus robust with expanded apex, projected parallel to labrum, somewhat shorter than labrum.

Thorax dark brown in ground-colour with posterior part of postpronotal lobe and postalar tubercle often paler, with brown to black setation; scutum viewed dorsally entirely velvety brown, slightly matt, with 2 indistinct paler vittae between acrostichal and dorsocentral setae; viewed anteriorly densely pruinose; mesopleuron uniformly greyish brown pollinose. Proepisternum with a few hair-like setae. Postpronotal lobe with 2 long thin and several shorter setae. Mesonotal setae distinct, thin; acr long, 4-serial, arranged in 2 pairs of closely spaced irregular rows, lacking on prescutellar depression, distance between rows narrower than length of acr; dc uniserial (with numerous additional setulae in anterior part), offset from row anteriorly, longer than acr, 2–3 distinct prescutellar dc; several ph, several presut spal, 6–8 npl (with a few additional shorter setae), several psut spal setulae, 1 pal and several short setulae, 8–9 pairs of sctl of various lengths.

Legs, including coxae, almost entirely brownish; knees of fore and mid legs brownish yellow, tarsi somewhat darker. Coxae and trochanters with unmodified hair-like setae. Fore femur with row of long anteroventral hair-like setae and somewhat similar setae on posteroventral, dorsal and posterior faces. Tibiae with row of slightly prominent thin posterodorsal setae. Mid femur with posteroventral bristly setae along entire length, long, nearly twice as long as width of femur; some moderately long setae on dorsal and posterior faces. Hind femur with long anteroventral and dorsal setae along whole length, length twice width of femur. 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-fourth length of dm-m, M branches widely separated; dm-m crossvein slightly concave. Apex of cell cua recurved, CuA+CuP long, pale, ending short of wing margin. Halter brown.

Abdomen brown, subshiny, finely brownish grey pollinose, covered with long black setae. Terminalia ( Fig. 24 View FIGURES 21–25 ) concolorous with abdomen, aligned or slightly dorsally flexed. Hypandrium with several long setae, rounded basally, strongly arched dorsally, slightly narrowed in posterior view and then expanded subapically; apex bifid, broadly separated, with 3–4 short lateral tooth-like projections ( Fig. 25 View FIGURES 21–25 ); gonocoxal apodeme short and broad; inner apodeme expanded and flattened, half length of gonocoxal apodeme; postgonite paired, very short and slender. Phallic guide extended well beyond epandrium, parallel with phallus, straight and mostly membranous apically and apex narrow. Epandrium slightly inflated laterally; dorsal bridge very broad, one-third length of epandrium; ventral margin with deep notch, apical half shiny, produced distally into tapered obliquely projecting surstylus; inner margin of surstylus with short rounded projection medially. Phallus slender, projecting straight well beyond epandrium, apex rounded, with hooked apex; ejaculatory apodeme plate-like, rounded, short, slightly shorter than length of gonocoxal apodeme. Cercus narrow, digitiform, nearly one-half length of epandrium, with apex narrowed, extended free from epandrium; hypoproct mostly plate-like, with pair of very short lateral processes.

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

Distribution. Nearctic: Canada (British Columbia), USA (Washington). This species is known only from the Cascade Mountain range of the Pacific Northwest of North America ( Fig. 26 View FIGURES 26–28 ).

Etymology. The specific name is after the Latin tribulosus (thorny), in reference to the spine-like projections on the apex of the hypandrium.

Remarks. This species is most closely related to I. recta   , in the basis of the shape of the epandrium and phallus.


Canadian National Collection of Insects, Arachnids, and Nematodes


University of British Columbia, Spencer Museum


Gesneriad Research Foundation


California Academy of Sciences