Iteaphila spinosa, 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 : 57-58

Iteaphila spinosa sp. nov.

( Figs 56, 57 , 81 )

urn:lsid:zoobank.org:act:8DFD999B-AF58-4040-AA67-C0CE4038FF0A

Type material. HOLOTYPE ♂, labelled: “(Hokkaido)/ Nukabira [43°21′N 143°14′E]/ 550-800 m / 13.vi.1967 / T. Saigusa”; “ HOLOTYPE / Iteaphila / spinosa/ Sinclair & Shamshev [red label]” ( KUMF) . PARATYPES: JAPAN. Hokkaido: Nagayamadake [43°42′N 142°50′E], Taisetsuzan , 10.vii.1967, TS (4 ♂, KUMF) ; same data as holotype (4 ♀, KUMF) ; Aizankei [43°43′N 142°48′E], Taisetsuzan , 16.vii.1986, TS (1 ♂, KUMF) ; same locality, 17.vii.1986, TS (1 ♀, KUMF) ; Otofukegawa, Nukabira [43°21′N 143°14′E], 14.vi.1067, TS (1 ♂, KUMF) .

Recognition. This species is distinguished from other Japanese species by the holoptic males, pale brown tibiae and pale abdominal setae. Males have short cerci and hypoproct processes, apex of phallus hooked, shaft of phallus with spines and surstyli tapered and project dorsally ( Fig. 56 ).

Description. Wing length 3.1–3.2 mm. Male. Head black, mostly with black setation, occiput finely greyish pollinose. Eyes holoptic, with upper ommatidia slightly enlarged. Frons represented by small triangular space just above antennae, bare, greyish pollinose. Ocellar triangle prominent, with 2 pairs of thin setae; anterior ocellars moderately long, posterior ocellars short. Postvertical and postocular setae similar to anterior ocellars; additionally, occiput covered with numerous brownish hairs in lower part.Antenna brown (sometimes scape and pedicel somewhat paler); scape short, subequal to globular pedicel, both with short setulae; postpedicel broad at base, nearly 2.5 times longer than wide, strongly tapered; stylus short, sensillum-tipped; segment 9 tubular, about twice as long as wide, apical sensillum about half length of segment 9. Proboscis long, projected obliquely; labium about length of head height; palpus projected parallel to labrum, somewhat shorter than labrum.

Thorax black, mostly with black setation; scutum viewed dorsally subshiny, finely brownish pollinose, viewed anteriorly more distinctly pollinose; mesopleuron uniformly denser greyish pollinose. Proepisternum with several short yellowish hair-like setae. Postpronotal lobe with 1 long and several short setae (sometimes intermixed pale and black). Mesonotal setae prominent; acr moderately long, arranged in 2–3 irregular rows anteriorly, becoming biserial posteriorly, 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, 1–2 presut spal, 2–3 long npl (sometimes with additional shorter setae), 1 psut spal (sometimes with additional setulae), 1 pal, 4–5 pairs of sctl.

Legs largely tawny yellow; coxae darkened (except apical part), tarsomere 2 apically and tarsomeres 3–5 entirely brownish (in darker specimens tarsi almost entirely brownish, except basal part of tarsomere 1). 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 femur is deep) and stronger. Hind femur with long thin anteroventral and dorsal setae, shorter basally. Tibiae lacking prominent setae. Tarsomere 1 of mid and hindlegs 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, elliptical, overlapping apex of R 1; anal lobe very prominent, acute. Sc complete; R 2+3 straight in apical part; R 4+5 unbranched; cell dm broad, longer than basal cells, hardly produced apically, almost truncate; base of M 2 (crossvein) nearly one-fourth length of dm-m, M branches widely separated; dm-m crossvein somewhat concave. Apex of cell cua recurved, CuA+CuP long, faint, ending just short of wing margin. Halter brown.

Abdomen pale brown, subshiny, finely greyish pollinose, covered with long yellowish hair-like setae. Terminalia ( Fig. 56 ) concolorous with abdomen, small. Hypandrium with several short setae, rounded, slightly upcurved, tapered to narrow apex in posterior view; gonocoxal apodeme long and broad; inner apodeme expanded and flattened, half length of gonocoxal apodeme; postgonite long, narrow, not extending beyond epandrium, apex divided into pair of rounded lobes. Phallic guide not extended beyond epandrium, parallel with phallus; apical section short, strongly curved. Epandrium somewhat inflated laterally; dorsal bridge moderately narrow medially, produced distally into shiny, strongly tapered, dorsally projecting surstylus. Phallus slender, arched beyond epandrium, apex arched, parallel-sided, base of shaft with small spiny projections; ejaculatory apodeme plate-like, rounded, slightly longer than length of gonocoxal apodeme. Cercus short, one-third length of epandrium; apex narrowly rounded, extended free from epandrium, anteromedial margin with flattened, rounded plate-like expansion ( Fig. 57 ); 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. Legs mostly yellow, progressively darker apically; fore and mid femora without prominent posteroventral setae. Halter yellow. Abdomen largely yellowish brown, with shorter setation, tergites 6 and 7 yellowish posteriorly. Cercus brownish, long, slender.

Distribution. Palaearctic: Japan. This species is restricted to the Japanese island of Hokkaido ( Fig. 81 ).

Etymology. The specific name is from the Latin spinosus (thorny), in reference to the spine-like projections on the base of the phallus.

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 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.