Dicranomyia (Erostrata) submelas, Kato & Tachi & Gelhaus, 2018

Kato, Daichi, Tachi, Takuji & Gelhaus, Jon, 2018, Revision of the subgenus Dicranomyia (Erostrata) Savchenko, 1976 (Diptera, Limoniidae) of Japan, Zootaxa 4441 (1), pp. 181-194 : 187-189

Dicranomyia (Erostrata) submelas sp. nov.

( Figs. 1 , 20–25 , 38 , 42 )

Specimens examined: Holotype male, JAPAN, Fukuoka, Fukuoka-shi, Sawara-ku, Itaya, Mt. Sefuri-san , 23.VIII, 2015, D. Kato ( BLKU) . Paratypes: JAPAN: [Honshu] 1 male, Tochigi, Nikko-shi , 8.IX.2011, D. Kato ( BLKU) ; 1 male, Echigo (Niitaga), Kurokawa , 18.VIII.1954, K. Baba ( USNM / identified as Limonia globulithorax by Alexander) ; 1 male, Aichi, Sitara-chô, Tamine, Mt. Takanosu-yama , 17.VIII.2014, D. Kato ( BLKU) ; 1 female, Gifu, Nakatsugawa-shi, Kashimo, Nishimata-dani Valley , 7.VIII.2015, D. Kato ( BLKU) ; 1 female, Nara, Kamikitayama-mura, Nishihara , 23.VIII.2015, D. Kato ( BLKU) ; 1 male, Tottori, Yazu-chô, Mt. Ôgino-sen , 17.IX.2014, D. Kato ( BLKU) ; 1 male, Okayama, Maniwa-shi, Hiruzen-Shimotokuyama , 11.VIII.2015, D. Kato ( BLKU) ; 1 male, Hiroshima, Hatsukaichi-shi, Yoshiwa, Mt. Misaka-yama , 2.IX.2015, D . Kato ( BLKU); [Shikoku] 1 male, Tokushima, Miyoshi-shi , Higashiiya-Ochiai , near Matsuogawa Dam , 10.VIII.2015, D . Kato ( BLKU); [ Kyushu ] 1 female, same data as holotype except 23.VIII.2015 ; 3 males, same data as previous except 5.IX.2015 ; 2 males same data as previous except 15.IX.2015 ; 1 male, same data as previous except 27.VIII.2016 ; 1 male, Ôita, Taketa-shi, Imamizu-tozanguchi , 10.IX.2016, T. Mishima ( BLKU) ; 1 male, Kumamoto, Yatsushiro-shi, Izumimachi-Momiki, Nigakobe-gawa River , 31.VII.2016, D. Kato ( BLKU).

Diagnosis. General coloration ( Fig. 38 ) brown to dark brown. Head blackish; palpus ( Fig. 1 ) one segmented. Abdomen dark brown. Male genitalia ( Fig. 20 ) with tergite 9 produced posteriorly into a pair of rounded lobes; gonostylus strongly concaved on distal 1/3 of inner margin, with a row of strong setae along concaved margin. Ovipositor ( Figs. 23–25 ) with cercus weakly curved dorsally; hypogynial valve long, about 1.9 times as long as sternite 8; furca curled inward along lateral margins and long, extending far beyond base of cercus.

Description. Male. Body length 4.0– 5.2 mm. Wing length 4.6–5.8 mm.

Head. Dark brown to black; antenna ( Fig. 1 ) brown to dark brown, pedicel about as wide as basal flagellomeres, flagellum with distinct pale pubescence; palpus ( Fig. 1 ) oval, one segmented.

Thorax. Brown to dark brown, postpronotum on lateral sides and anepimeron near wing base weakly paler, antepronotum, pronotum, and anepisternum sometimes slightly darkened. Wing tinged with black. Legs dark brown, coxae, trochanters, and base of femora slightly paler. Halter dark brown.

Abdomen. Dark brown, sternite 7 with a long-conical, membranous internal sac on posterior end. Male genitalia ( Fig. 20 ) with tergite 9 squarish with rounded corners, bearing a pair of rounded lobes on posterior margin, each lobe separated by wide U- or V-shaped notch, disc on tergite 9 with a longitudinal internal ridge at middle; gonocoxite cylindrical, about as long as width of tergite 9, ventromesal lobe large and truncated at tip, about 1/4 as long as gonocoxite and about as long as width; gonostylus about as long as gonocoxite, widest at basal 2/3, distal 1/3 strongly concaved posteromesally with a row of strong setae along concaved margin, outer surface of gonostylus with a small protuberance bearing two setae near base; paramere ( Figs. 21–22 ) with mesal-apical lobe slender, curved dorsomedially and pointed at tip, with a ridge-like short extension near base of dorsal margin, lateral part of paramere strongly produced into ribbon-like plate, curled laterally and ventrally, the plate longer than 1/3 of width of paramere; aedeagus ( Fig. 21 ) cylindrical, narrowed near tip, tip bilobed and slightly widened, directed ventrally.

Female. Body length 4.6–4.9 mm. Wing length 4.9–5.5 mm.

Almost same as male except terminalia. Ovipositor ( Figs. 23–25 ) brown to dark brown; tergite 9 more acute on lateral angles than the other species; tergite 10 in lateral view narrow, about half height of tergite 8, tapered near tip, with two pairs of long setae on posterior margin; cercus longer than sternite 8, weakly curved dorsally on distal half, reaching at level of tip of hypogynial valve, ventral margin with weak setae on basal 1/3; sternite 8 roughly square with rounded corners, slightly longer than width, with a pair of distinct internal ridge; hypogynial valve long, about 1.9 times as long as sternite 8, tip subacute, basal part of the valve as high as tergite 10 in lateral view; furca long, about 2.3 as long as width, pointed at setigerous tip, extending far beyond base of cercus, lateral margin bent medially.

Distribution. Japan (Honshu, Shikoku, Kyushu ( Fig. 42 )).

Etymology. The specific epithet refers to the similarity to a Taiwanese species, D. melas .

Remarks. This species is somewhat similar to D. globulithorax Alexander, 1924 , but differing from it in the following characters: male genitalia with ventromesal lobe of gonocoxite stout and truncated at tip ( Fig. 20 ), while gradually narrowed and rounded at tip in D. globulithorax ; gonostylus emarginated on distal 1/3 of inner apical edge ( Fig. 20 ), while emarginated on distal 1/6 of inner apical edge in D. globulithorax ( Fig. 7 ); mesal-apical lobe of paramere with a ridge-like short extension along outer margin near base ( Fig. 22 ), while without a ridge-like short extension in D. globulithorax (as in Fig. 6 ). In addition, another similar species, D. melas , is differentiated from this species by the following characters: gonostylus more shallowly concaved at inner apical edge, the area 1/ 5 as long as gonostylus, with brush of shorter setae at tip, whereas apical 1/3 emarginated, with brush of longer setae at tip in this species ( Fig. 20 )).

Figures

FIGURES 1–3. Head in lateral view and wing. 1: Dicranomyia (Erostrata) submelas sp. nov.; 2: D. (E.) tabashii; 3: D. (E.) globithorax. Scale bars 1–2 = 0.1 mm, 3 = 1 mm. Abbreviations: fl, flagellum; lb, labellum; pd, pedicel; pl, palpus; rs, rostrum; sc, scape.

FIGURES 20–25. Male genitalia and female ovipositor of Dicranomyia (Erostrata) submelas sp. nov. 20: Male genitalia (paratype, Japan, Aichi) in dorsal view; 21: Internal structure of male genitalia in dorsal view; 22: Paramere of male genitalia in outer view; 23: Female ovipositor (paratype, Japan, Fukuoka) in lateral view; 24: Sternite 8 and hypogynial valve in ventral view; 25: Furca in ventral view. Scale bars = 0.1 mm.

FIGURES 35–40. Adults of Dicranomyia (Erostrata) spp. 35: D. (E.) globithorax; 36: D. (E.) globulithorax; 37: D. (E.) submelas sp. nov.; 38: D. (E.) reniformis sp. nov.; 39: D. (E.) tabashii; 40: D. (E.) yazuensis sp. nov. Scale bars = 2 mm.

FIGURES 41–44. Distributions of Japanese species of Dicranomyia (Erostrata). 41: D. (E.) globithorax (red circle) and D. (E.) globulithorax (blue triangle); 42: D. (E.) submelas sp. nov.; 43: D. (E.) reniformis sp. nov. (red circle) and D. (E.) yazuensis sp. nov. (blue triangle); 44: D. (E.) tabashii.

FIGURES 4–13. Male genitalia of Dicranomyia (Erostrata) globithorax and D. (E.) globulithorax, and female ovipositor of the former species. 4–6, 11–13. D. globithorax (non-type, Japan, Aomori). 7. D. globulithorax (holotype), 8–10, D. globithorax (non-type, USA, Pennsylvania). 4: Male genitalia in dorsal view; 5: Internal structure of male genitalia in dorsal view; 6: Paramere of male genitalia in outer view; 7: Gonostylus in dorsal view; 8: Paramere in dorsal view; 9: Paramere, outer surface; 10: Internal sac on male sternite 7 (non-type, Canada); 11: Female ovipositor in lateral view; 12: Sternite 8 and hypogynial valve in ventral view; 13: Furca in ventral view. Scale bars = 0.1 mm. Abbreviations: aed, aedeagus; cer, cercus; fu, furca; gc, gonocoxite; gs, gonostylus; hyp vlv, hypogynial valve; ma l, mesal-apical lobe; S8, sternite 8; T8–10, tergites 8–10; vm l, ventromesal lobe.