Iteaphila luteitibia, 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 : 52-54

Iteaphila luteitibia sp. nov.

( Figs 53 , 63 )

urn:lsid:zoobank.org:act:8C17B8A3-BB5C-4B50-A0A2-BA5BA1DD8479

Type material. HOLOTYPE ♂, labelled: “[YAMANASHI]/ Kanayama [35.86°N 138.57°E]/ Sudama/ April 16, 1964 / A. Kato col.”; “ HOLOTYPE / Iteaphila / luteitibia/ Sinclair & Shamshev [red label]” ( KUMF) . PARATYPES: JAPAN. Kumamoto: Haki, Izumimura [32°32′N 130°48′E], 21.iv.1980, K. Ohara (1 ♀, KUMF) . Nagano: Okushiga kohgen [36°46′N 138°31′E], 31.v.1975, TS (3 ♂, 5 ♀, KUMF) . Yamanashi: same data as holotype (5 ♂, 1 ♀, KUMF) ; Kanayama , 3.vi.1963, A. Kato (1 ♂, KUMF) .

Additional material examined. JAPAN. Fukuoka: Inunakiyama, Wakamiya [33°41′N 130°32′E], 15.iv.1962, M. Shiga (1 ♂, 2 ♀, KUMF); Inunakiyama, Wakamiya, 16.iv.1961, TS (1 ♀, KUMF) .

Recognition. This species is distinguished from the other Japanese species by the holoptic males, pale tibiae and pale abdominal setae. Males have short cerci and distinct hypoproct process, apex of phallus arched apically and surstyli broad and project dorsally ( Fig. 53 ).

Description. Wing length 3.1–3.4 mm. Male. Head black in ground-colour, mostly with brown to black setation, occiput finely brownish pollinose. Eyes holoptic, with upper ommatidia enlarged. Frons represented by small triangular space just above antennae, bare, brownish grey pollinose. Ocellar triangle prominent, with 2 pairs of thin proclinate setae; anterior ocellars long, posterior ocellars short. Postvertical and postocular setae rather long, thin; additionally, occiput covered with numerous similar setae in lower part. Antenna brown; scape short, subequal to globular pedicel, both with short setae; postpedicel 3–3.5 times longer than wide, smoothly tapered; stylus short, sensillum-tipped; segment 9 distinct, tubular, about 2 times longer than wide, apical sensillum half length of segment 9. Proboscis long, projected obliquely; labium about half height of head; palpus slender, projected parallel to labrum, somewhat shorter than labrum.

Thorax black in ground-colour, with black setation; scutum viewed dorsally subshiny, finely brownish pollinose, viewed anteriorly brownish grey pollinose, with hardly prominent brown vittae down acr and dc setae; mesopleuron uniformly denser greyish pollinose. Proepisternum with several short hair-like setae. Postpronotal lobe with 1 long and several short setae. Mesonotal setae prominent; acrostichals arranged in 4 irregular rows anteriorly, becoming biserial posteriorly, moderately long, lacking on prescutellar depression, distance between rows shorter than length of setae; dc uniserial, offset from row anteriorly, mostly subequal to acr, 2–3 prescutellar pairs longer; 1 ph, 1 presut spal, 4 npl (with several additional shorter setae), several psut spal of different lengths, 1 pal, 6–7 pairs of sctl.

Legs with fore coxa, trochanter and femur (except extreme apex) brownish yellow; mid and hind coxa, trochanter and femur (except extreme apex) brownish; tarsi with tarsomeres 3–5 brownish (sometimes hind tibia and tarsomeres 1–2 brownish apically); otherwise legs yellowish. Coxae and trochanters with ordinary hair-like setae. Fore femur with row of thin posteroventral setae longer subapically. Mid femur with similar pattern of setation but subapical setae longer (somewhat longer than width of femur) and stronger. Hind femur with long thin anteroventral, anterodorsal (somewhat shorter) and posterodorsal setae. Tibiae with row of somewhat prominent posterodorsal setae. Tarsomere 1 of all legs with stiff ventral setae; tarsomere 5 on all legs somewhat flattened; pulvilli broad, shorter than tarsal claw.

Wing finely infuscate; basal costal seta absent; pterostigma distinct brownish yellow, elliptical, overlapping apex of R 1; anal lobe very prominent, acute. Sc complete; R 2+3 straight in apical part or slightly curved beneath pterostigma; R 4+5 unbranched; cell dm broad, longer than basal cells, hardly produced apically, almost truncate; base of M 2 (crossvein) nearly one-third length of dm-m, M branches widely separated; dm-m crossvein straight. Apex of cell cua recurved, CuA+CuP long, faint, ending just short of wing margin. Halter yellowish brown (sometimes knob somewhat darkened).

Abdomen dark brown, subshiny, finely brownish grey pollinose, covered with long yellowish bristly hairs. Terminalia ( Fig. 53 ) concolorous with abdomen, small. Hypandrium with several short setae, rounded, slightly upcurved, tapered to truncate apex in posterior view, with lateral flap-like dorsal extension; gonocoxal apodeme short and narrow; inner apodeme expanded and flattened, slightly longer than length of gonocoxal apodeme; postgonite long, flattened plate, arched, truncate apically, with lateral projection. Phallic guide extended slightly beyond epandrium, parallel with phallus; apical section paired, tapered, strongly arched with tooth-like projections and jagged margin. Epandrium somewhat inflated laterally; dorsal bridge moderately narrow medially; produced distally into slightly dorsally projecting surstylus; apex of surstylus with tooth-like projection. Phallus slender, arched beyond epandrium, apex arched, slightly tapered; ejaculatory apodeme plate-like, rounded, longer than length of gonocoxal apodeme. Cercus short, one-third length of epandrium; apex broadly rounded, extended free from epandrium; hypoproct produced into pair of long, slender processes, appressed to cercus, projecting beyond epandrium.

Female. Similar to male, except as follows: Eyes dichoptic, ommatidia equally small. Frons very broad, somewhat widened toward ocellar triangle, shiny, with marginal setulae. Scutellum with 4 pairs of setae. Halter distinctly yellow. Legs usually paler than in male, with fore coxa, trochanter, femur and mid femur yellowish, hind femur broadly yellowish basally and apically. Fore and mid femora without prominent posteroventral setae. Abdomen with shorter setation, tergites 6 and 7 paler than preceding tergites. Cercus brownish, long, slender.

Distribution. Palaearctic: Japan. This species is present on the Japanese islands of Honshu and Kyushu ( Fig. 63 ).

Etymology. The specific name is derived from the Latin luteus (yellow), in reference to the yellow coloured male tibia.

Remarks. The male from Fukuoka Prefecture (see Additional material examined section) has darker legs (brownish to brownish yellow), brownish halteres, and abdomen with black to brown setation. The only difference in the male terminalia is the slightly more upright and somewhat narrower surstylus. This male cannot be included in I. incus sp. nov. (the only species from Japan having dark abdominal setation), because the latter has very short antennal stylus and distinctive male terminalia. The females of this series from Fukuoka Prefecture quite agree with the females of the type series.

Figures

FIGURES 53–57. Male terminalia of Iteaphila with unbranched R 4+5. 53, I. luteitibia sp. nov., lateral view; 54, I. nupta (Melander), lateral view; 55, I. sierrensis sp. nov., lateral view; 56, I. spinosa sp. nov., lateral view; 57, same, left cercus, dorsal view. Scale bar = 0.1 mm. Abbreviations: cerc—cercus; hypd—hypandrium; hyprct proc—hypoproct process; ph—phallus; ph gd—phallic guide; 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.