Eloeophila tergilobellus Kato, 2021

Kato, Daichi, 2021, Taxonomic study of the genus Eloeophila Rondani, 1856 of Japan (Limoniidae Diptera), Zootaxa 4995 (3), pp. 425-451 : 444-445

Eloeophila tergilobellus Kato , sp. nov.

( Figs 11A–H , 13C )

Diagnosis. Blackish species with unpatterned wing except stigma. Prescutum grey, mottled with dark spots and stripes. Pleuron mainly dark brown. Wing with numerous tiny spots in all cells and five large spots at anterior margin. All crossvein seamed with dark brown. Legs yellow to dark brown, segments proximal to middle of femora pale yellow. Halter dusky yellow, 1.3 times as long as thorax, knob weakly dark. Male tergites 7 and 8 each with paired lobe at caudal margin. Outer gonostylus laterally flattened, Y-shaped, ventral branch shorter and rounded at tip.

Type material. HOLOTYPE male, JAPAN, Honshu, Niigata, Jôetsu-shi, Ôshima-ku , Shôbu , Alt. 760 m, 26.V.2020, D. Kato ( BLKU) . PARATYPES: JAPAN. [Honshu] 1 male , Aomori, Hirosaki-shi, Sôma, Mt. Shigigasawa-yama , 24. V.2013, D. Kato ( BLKU); 4 males 2 females , Aomori, Fukaura-machi, Mt. Takanio-yama , 11. V.2014, D. Kato ( BLKU)); 2 males , Aomori, Towada-shi, Okuse, Tsutanuma Path , 10. V.2014, D. Kato ( BLKU); 2 males, same data as previous except 23. V.2014; 2 males 3 females, Niigata, Tôkamachi-shi, Matsunoyama-Amamizukoshi, Mt. Amamizu-yama , Alt. 920 m, 3.VII.2019, D. Kato ( BLKU); 5 males, same data as holotype .

Description. Male. General coloration blackish ( Fig. 11A ). Head. Dark brownish grey. Antenna dark brown, about 4.5 times as long as head. Flagellomeres cylindrical. Rostrum and palpus dark brown.

Thorax. Dark brown to dark brownish grey. Prescutal pit black, short oval. Pleuron dark brown. Wing ( Fig. 11B ) tinged with pale brown, unpatterned except oval dark stigma at crossvein r-r. Venation: Sc ending more than length of crossvein r-m proximal to level of fork of Rs; crossvein Sc-r situated 1–3 times times of itself proximal to tip of Sc; first section of R 4+5 almost straight and usually suberect to Rs; cell m 1 as long as or shorter than its petiole; supernumerary m-cu slightly distal to or sometimes proximal to Rs origin, erect; A 1 almost straight. Posterior wing margin smooth, not produced at tip of A 1. Legs pale yellow, base of fore coxa dark. Femora to tarsi except bases of femora often dark; apical segment of each tarsus weakly infuscated. Halter dusky yellow, about 1.3 times as long as thorax; knob weakly dark.

Abdomen. Dark brown; tergites 7 and 8 each with paired lobes at caudal margin; lobes on tergite 7 bearing several short stout setae ( Fig. 11C ). Male terminalia ( Figs 11C–H ) with tergite 9 bearing small pointed lateral lobe and large oval swelling at middle; central part of this swelling largely membranous and longitudinally concaved at middle; posterior margin of this swelling serrate with small notch at middle ( Fig. 11C ). Gonocoxite stout, about 1.5 times as long as tergite 9, broader basally; tip of ventral side roundly produced posteriorly; distal half on dorsal side strongly swollen ( Fig. 11D ). Outer gonostylus laterally flattened, Y-shaped, rounded at tips; dorsal arm longer and curved, serrate at ventral margin distally; ventral arm straight, covered with tiny teeth on distal part ( Fig. 11E ). Inner gonostylus flattened on distal part, center of flattened part longitudinally concaved ( Fig. 11F ). Paramere roughly triangular, rounded at tip; lateral lobe curved laterally, about as long as triangular part ( Fig. 11G ). Lower shelf attached to aedeagus, not distinctly produced ventrally ( Fig. 11H ). Aedeagus cylindrical, almost straight, about five times as long as wide in lateral view; tip extending slightly beyond posterior end of paramere ( Fig. 11G ). Vesica roughly oval, about as long as aedeagus in dorsal view. Apodeme of vesica small; tip directed ventrally.

Female. Generally resembling male. Antenna shorter, about three times as long as head. Abdomen with tergite 7 without paired lobes. Ovipositor brown on tergites. Sternite 8 dark brown. Hypogynial valve brown, about 1.5 times as long as sternite 8. Cercus amber-color, slender, upcurved on distal 1/3, about 1.5 times as long as tergite 10.

Measurements. Male (n = 17): body length: 4.8–5.5 mm; wing length: 5.7–6.5 mm. Female (n = 5): body length: 5.6–6.2 mm; wing length: 5.8–6.7 mm.

Distribution. Japan (Honshu) ( Fig. 13C ).

Etymology. The specific name tergilobellus is from the Latin tergum / tergi- (tergum, back) + lobellus (small lobe) and refers to the peculiar small lobes on the male tergites 7–8. The name is a noun in nominative singular.

Remarks. This species is similar to E. verrucosa , but is differentiated from it by the following characters: male tergites 7 and 8 each with paired lobes at caudal margin ( Fig. 11C ) (male tergite 8 with long rectangular lobe at caudal margin in E. verrucosa ); dorsal surface of gonocoxite with one large swelling ( Fig. 11D ) (with three lobes bearing tufts of long setae in E. verrucosa ); outer gonostylus with ventral arm rounded at tip, without claw-shaped lobe at tip ( Fig. 11E ) (tipped with claw-shaped lobe in E. verrucosa ).

Figures

FIGURE 11. Eloeophila tergilobellus Kato, sp. nov. A. habitus, lateral view; B. wing; C. male terminalia, dorsal view; D. gonocoxite, lateral view (upper = dorsal, left = anterior); E. outer gonostylus, ventral view; F. inner gonostylus, outer surface; G. aedeagal complex, dorsal view; H. same, lateral view (left = dorsal). Scale bars: A–B, 2 mm; C–H, 0.1 mm.

FIGURE 13. Distributions of Japanese species of Eloeophila. A. E. amamiana (red); E. apicisetula Kato, sp. nov. (blue); B. E. canidorsalis Kato, sp. nov. (red); E. dietziana (blue); C. E. enischnophallus Kato, sp. nov. (red); E. kintaro (blue); E. tergilobellus Kato, sp. nov. (green); D. E. hadrophallus Kato, sp. nov. (red); E. lilliputina (blue); E. persalsa (green); E. E. subaprilina (red); F. E. ussuriana iwatensis (red); E. verrucosa (blue).