Iteaphila subnupta, 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 : 58-59

Iteaphila subnupta sp. nov.

( Figs 58 , 65 )

urn:lsid:zoobank.org:act:9CE3F427-E1AA-4BDB-9CDF-97DBA00F09E6

Type material. HOLOTYPE ♂, labelled: “USA: ID: Shoshone Co. / Hobo Cedar Grove Bot. Area / St. Joe NF, 21.vi.2014, 1360 m/ N47°05.160′ W116°06.776′ / ex. stream/for. B.J. Sinclair ”; “ HOLOTYPE / Iteaphila / subnupta/ Sinclair & Shamshev [red label]” ( CNC) . PARATYPES: CANADA. Alberta: Jasper NP , Pocahontas Cpgd, 53.195°, -117.914°, 1131 m, MT , 14.vi.2012, BIOBus 2012, BIOUG06117 - C01, BIOUG06119 - E06 (2 ♂, barcoded, CBG) . British Columbia: Lisdale Lk. , 58°41′N 133°04′W, 9 and12.vii.1960, WWM (8 ♂, 8 ♀, CNC) ; same data except, 9 and11.vii.1960, R . Pilfrey (11 ♂, 3 ♀, CNC); 24 km NE Sicamous [50°58′18″N 118°44′04″W], 19.v.1991, AB (1 ♂, CNC) . USA. Idaho: same data as holotype (1 ♂, 1 ♀, CNC); Kootenai Co., Hwy 97; St. Joe NF, FR438, 19.vi. 2014, 660 m, N47°36.392′ W116°40.099′, Beauty Ck, BJS (1 ♂, CNC) ; Lake Waha [46°12′36″N 116°50′16″W], 9.vi.1918, ALM (4 ♂, 1 ♀, USNM) ; Waha, 30.v.1924, ALM (1 ♂, 2 ♀, USNM) ; Latah Co., nr Bovill [46°51′33″N 116°23′40″W], 9.v.1978, S. T . Rose (1 ♂, WFBM) . Oregon: Crook Co., Ochoco NF, along Kyle Ck , 44°21.56′N 120°22.5′W, 19.iv.–12.vii.2017, MT , S. Fitzgerald (3 ♂, 1 ♀, CNC); Klamath Co. 12 mi SW Keno [42°7′36″N 121°55′44″W], side hill rill, 5.vi.1964, V . Miller (1 ♂, WSU) . Washington: Asotin Co., Fields’ Spring SP [46°04′53″N 117°10′14″W], 4 mi S Anatone, 3500–4000 ft, 12–13.vi.1974, MT, WJT (1 ♂, 1 ♀, USNM) .

Recognition. This species is distinguished from A. nupta by the surstylus extending horizontally from the epandrium, not curved dorsally, and postgonite with pair of slender apical lobes ( Fig. 58 ).

Description. Wing length 3.3–3.4 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 longer than short 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, nearly 4 times longer than basal width, base somewhat expanded and smoothly tapered; stylus ca 3–4 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, somewhat 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 hair-like 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 greater than length of acr; dc uniserial (with some additional setulae in anterior part), offset from row anteriorly, slightly longer than 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, 6–7 pairs of sctl.

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 short anteroventral hairlike setae and somewhat longer setae on posteroventral, dorsal and posterior faces. Fore tibia with row of slightly prominent thin posterodorsal setae. Mid femur with moderately 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 somewhat 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 just short of wing margin. Halter brown.

Abdomen brown, subshiny, finely brownish grey pollinose, covered with long brownish setae. Terminalia ( Fig. 58 ) concolorous with abdomen, small, hypandrium and epandrium densely clothed in long pubescence. Hypandrium with several long setae, rounded, upcurved apically with narrowly rounded and truncate apex (posterior view); gonocoxal apodeme short and slender; inner apodeme expanded and flattened, subequal in length with ejaculatory apodeme; postgonite arched, produced into pair of slender apical lobes. Phallic guide extended slightly beyond epandrium, parallel with phallus and bent nearly at right angles subapically; bent apical section paired with jagged or toothed surface apically; apex tapered. Epandrium not inflated laterally; dorsal bridge narrow; produced distally into slender horizontally projecting surstylus; apex of surstylus with finger-like projection medially. Phallus slender, arched slightly beyond epandrium, bent nearly at right angles subapically; apical section broad, truncate; ejaculatory apodeme plate-like, rounded, shorter than gonocoxal apodeme. Cercus short, triangular, one-quarter length of epandrium; apex rounded, extended free from epandrium; hypoproct produced into pair of very short, slender processes, slightly projecting beyond epandrium.

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 (Alberta, British Columbia), USA (Idaho, Oregon, Washington). This species primarily occurs in the Pacific Northwest of North America, extending into northern British Columbia ( Fig. 65 ).

Etymology. This species is named after its similarity with I. nupta .

Remarks. This species is very similar to I. nupta , distinguished by the male terminalia, specifically the apex of the epandrium and surstylus, as well as the configuration of the postgonite.

Figures

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.

FIGURES 62–65. Distribution of Iteaphila with unbranched R. 62, I. dichoptica sp. nov.; 63, luteitibia sp. nov., I. incus sp. 4+5 nov.; 64, I. longipalpis (Melander); 65, I. nupta (Melander), I. subnupta sp. nov.