Iteaphila longiphallus, 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 : 31-33

Iteaphila longiphallus sp. nov.

( Figs 36 , 79 )

urn:lsid:zoobank.org:act:1F0ED997-C8C6-419E-9020-16681082C1B3

Type material. HOLOTYPE ♂, labelled: “Old Chelsea [45°32′N 75°52′W]/ Que. 16.v.1958 / J. R. Vockeroth”; “ HOLOTYPE / Iteaphila / longiphallus/ Sinclair & Shamshev [red label]” ( CNC) . PARATYPES: CANADA. Ontario: Carleton Co., Constance Bay , 45°29′2″N 76°4′54″W, oak savannah, MT, 29.vi.–31.v.2006, J. Skevington (1 ♀, DEBG) ; Kettleby [44°00′30″N 79°33′53″W], 17.v.1925, N.K. Bigelow (1 ♂, CNC) ; Marmora , 18.v.1952, J.C. Mitchell (1 ♂, CNC) . Quebec: Alymer [45°24′N 75°51′W], 16.v.1924, C.H. Curran (1 ♂, CNC) ; same data except, 20–28.v.1923 (1 ♀, CNC; 2 ♀, USNM) ; same data except, 14.v.1924 (1 ♀, CNC) ; Alymer, Chemin Klock , 5–12.v.2013, Lindgren trap in mixed forest, L. LeSage (1 ♂, CNC) ; Gatineau Pk, King Mtn , summit, 45°29′20″N 75°51′45″W, 13.v.2009, JMC (1 ♂, CNC) ; same data as holotype (1 ♂, 1 ♀, CNC) ; Kingsmere [45°29′27″N 75°50′29″W], 16.v.1958, JGC (1 ♂, CNC) ; Laniel [47°03′N 79°16′W], 7.vi.1943, O. Peck (1 ♂, CNC) .

Recognition. This species is distinguished by its small size and elongate phallus that is arched down along the posterior margin of the hypandrium ( Fig. 36 ).

Description. Wing length 2.3–2.4 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 broad, nearly 2.5 times longer than basal width, base somewhat expanded and smoothly tapered; stylus short, length subequal to width (basal segment not visible), sensillum-tipped; segment 9 tubular, length subequal to width, apical sensillum about as long as segment 9. Proboscis elongate, projected obliquely; labium subequal to head height; palpus projected parallel to labrum, slender, expanded apically, somewhat shorter than labrum.

Thorax dark brown in ground-colour with posterior part of postpronotal lobe and postalar tubercle usually dark, with brown to black setation; scutum viewed dorsally shiny, slightly matt, without distinct vittae; viewed anteriorly densely brown pruinose, without vittae; mesopleuron uniformly greyish brown pollinose. Proepisternum with a few hair-like setae. Postpronotal lobe with 1–2 long thin and several shorter setae. Mesonotal setae distinct, rather stout; acr short, biserial, arranged in closely spaced irregular rows, lacking on prescutellar depression, distance between paired rows less 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, 5–6 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 hair-like setae and somewhat longer setae on posteroventral, dorsal and posterior faces. 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. Tibiae without prominent posterodorsal 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 short of wing margin as pale line. Halter brown.

Abdomen brown, subshiny, finely brownish grey pollinose, covered with long brownish setae. Terminalia ( Fig. 36 ) concolorous with abdomen, small. Hypandrium without long setae or pubescence, rounded, upcurved apically, narrowed, apex divided; gonocoxal apodeme short, broad apically; inner apodeme expanded and flattened, shorter than ejaculatory apodeme; postgonite absent. Phallic guide very short, far short from dorsal margin of epandrium. Epandrium not inflated laterally; dorsal bridge narrow; produced distally into broad horizontally projecting surstylus; apex of surstylus prolonged medially. Phallus slender, arched beyond epandrium, recurved, arched posteriorly as long membranous filament along posterior margin of hypandrium; ejaculatory apodeme plate-like, rounded, subequal to length of gonocoxal apodeme. Cercus long, digitiform, one-half length of epandrium; apex rounded, extended free from epandrium; hypoproct extending along posterior margin of cercus with long marginal setae, without forming distinct apical process.

Female. Similar to male, except as follows:Eyes dichoptic; ommatidia equally small.Frons very broad, somewhat widened toward ocellar tubercle, shiny, without pruinescence, with marginal setulae. Scutellum usually with 3–5 pairs of setae. Legs, including coxae, usually paler than male, with reduced chaetotaxy. Abdomen somewhat paler, especially ventrally, with shorter, less prominent setae. Cercus brownish, long, slender, covered with dark setae.

Distribution. Nearctic: Canada (Ontario, Quebec). This is an eastern North American species, presently known only from eastern Ontario and western Quebec ( Fig. 79 ).

Etymology. The specific name is after the Latin longus (long), in reference to the elongate phallus.

Remarks. The male terminalia of I. longiphallus is very similar to I. furcata , but differs in the reduction of the postgonites and shape of the epandrium.

Figures

FIGURES 36–40. Male terminalia of Iteaphila with unbranched R 4+5, lateral view. 36, I. longiphallus sp. nov.; 37, I. arnaudi sp. nov.; 38, I. bayarea sp. nov.; 39, same, apex of hypandrium, posterior view; 40, Iteaphila sp., apex of hypandrium, posterior view. Scale bar = 0.1 mm. Abbreviations: pgt—postgonite; ph—phallus; ph gd—phallic guide; 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.