Eloeophila apicisetula Kato, 2021

Kato, Daichi, 2021, Taxonomic study of the genus Eloeophila Rondani, 1856 of Japan (Limoniidae Diptera), Zootaxa 4995 (3), pp. 425-451 : 428-429

Eloeophila apicisetula Kato , sp. nov.

( Figs 2A–G , 13A )

Diagnosis. Brownish species with sparsely spotted wing. Prescutum without dark stripe or spot except prescutal pit. Pleuron weakly dark on dorsal part. Wing with seven dark spots at anterior margin. Cells near wing tip with macrotrichiae. Legs generally yellowish, tips of femora and tibiae not dark. Halter pale yellow, shorter than thorax. Outer gonostylus dorsoventrally flattened, gradually narrow to tip, outer margin weakly serrate, outer apical edge claw-shaped, inner one larger and rounded.

Type material. HOLOTYPE male, JAPAN, Honshu, Aomori, Towada-shi, Okuse , Tsutanuma Path , Alt. 460 m, 3.VIII.2015, D. Kato ( BLKU) . PARATYPES: JAPAN: [ Honshu ] 1 female, same data as holotype except 30.VIII.2014 ; 1 male, Akita, Kazuno-shi, Hachimantai, near Hebisawamura Pond , Alt. 800 m, 5.VIII.2015, D. Kato ( BLKU) ; 1 male 1 female, Niigata, Tôkamachi-shi, Matsunoyama-Amamizukoshi, Mt. Amamizu-yama , Alt. 920 m, 18.VIII.2019, D. Kato ( BLKU) ; 5 males, Nagano, Ueda-shi, Sugadairakôgen, Sugadaira Montane Research Center , 20.VIII.2013, D. Kato ( BLKU) .

Description. Male. General coloration ocherous and dark brown ( Fig. 2A ). Head. Greyish brown. Antenna about 2.5 times as long as head. Scape greyish brown, succeeding segments pale ocherous. Flagellomeres oval on basal four segments, long bacilliform on distal segments; ventral sides of basal three flagellomeres distinctly produced ventrally. Rostrum and palpus dark brown.

Thorax. Notum dusky yellow to light brown, slightly brownish on lateral sides of prescutum and scutum; lateral margin of prescutum often narrowly whitish. Postpronotum and posterior margin of antepronotum weakly whitish. Prescutal pit short oval and dark brown, this dark area extending posteriorly in short length. Pleuron dusky yellow to ocherous, weakly dark on anepisternum, anepimeron, and around posterior spiracle. Wing ( Fig. 2B ) tinged with brown, sparsely spotted with dark brown. Seven spots on anterior part of wing: first one at crossvein h; second between crossvein h and Rs origin; third at Rs origin; fourth at crossvein Sc-r; fifth at crossvein r-r largest; sixth and seventh at tips of R 2 and R 3, respectively. Forks of Rs and M 1+2, tips of M 1 to A 1, and all crossveins with vaguely darker spots or seams. Cells r 2 to m 2 each with macrotrichiae near tip, row of macrotrichiae in cell r 3 longest, occupying about distal half. Venation: Sc ending about length of crossvein r-m or less proximal to level of fork of Rs; crossvein Sc-r situated 1–3 times of itself proximal to tip of Sc; first section of R 4+5 curved and oblique to Rs; cell m 1 various in length, longer to shorter than its petiole; supernumerary m-cu situated more than length of itself distal to Rs origin, almost erect; A 1 weakly sinuous. Posterior margin of wing smooth, not produced at tip of A 1. Legs yellow to dusky yellow, tarsomere 5 slightly infuscated. Halter pale yellow, about 0.8 times as long as thorax.

Abdomen. Dark brown, genital segments brown. Male terminalia ( Figs 2C–G ) with tergite 9 widely concaved at center of posterior margin; concaved part about as wide as produced lateral part ( Fig. 2C ). Gonocoxite cylindrical, about twice as long as tergite 9, inner part near base pointed. Outer gonostylus dorsoventrally flattened, gradually narrow toward tip; outer margin weakly serrate; tip with two small points, outer one smaller and claw-shaped, inner one larger and rounded ( Fig. 2D ). Inner gonostylus fleshy, oval, about as long and wide as outer gonostylus. Paramere with mesal-apical lobe flat finger-shaped, about three times as long as lateral lobe ( Fig. 2G ). Lower shelf gently produced ventrally; posterior end attached to aedeagus ( Fig. 2F ). Aedeagus straight and cylindrical, about seven times as long as wide in lateral view; tip ending well beyond tip of paramere ( Fig. 2E–F ). Vesica oval, about as long as aedeagus. Apodeme of vesica small, directed anteroventrally.

Female. Generally resembling male. Ovipositor ocherous on tergites. Tergite 10 gradually dark toward tip. Sternite 8 ocherous. Hypogynial valve dark brown, about 2.5 times as long as sternite 8. Cercus amber-color, slender, upcurved on distal 1/3, about twice as long as tergite 10.

Measurements. Male (n = 8): body length: 4.8–5.6 mm; wing length: 5.8–6.8 mm. Female (n = 2): body length: 5.8–6.1 mm; wing length: 5.8–5.9 mm.

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

Etymology. The specific name apicisetula is from the Latin apex / apici- + setula, referring to the small setae near the wing tip. The name is a noun in nominative singular.

Remarks. This species is somewhat similar to E. kintaro in general appearance but is differentiated from it by the following characters: pleuron weakly dark on dorsal part; outer margin of outer gonostylus serrate, without large lobe ( Fig. 2D ) (with large lobe in E. kintaro ( Fig. 7D ); aedeagus long, tip extending well beyond tip of mesal-apical lobe ( Fig. 2E ) (shorter, tip ending near tip of mesal-apical lobe in E. kintaro ( Fig. 7E )).

Figures

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

FIGURE 7. Eloeophila kintaro (Alexander, 1957). A. habitus, lateral view; B. wing; C. male terminalia, dorsal view; D. outer gonostylus, ventral view; E. aedeagal complex, dorsal view; F. same, lateral view (left = dorsal); G. paramere, dorsal surface. Scale bars: A–B, 2 mm; C–G, 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).