Dicranomyia (Erostrata) reniformis

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: 186-187

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Dicranomyia (Erostrata) reniformis

sp. nov.

Dicranomyia (Erostrata) reniformis  sp. nov.

( Figs. 14–19 View Figure , 37 View Figure , 43 View Figure )

Specimens examined: Holotype male, JAPAN, Fukuoka, Fukuoka-shi, Sawara-ku, Itaya, Mt. Sefuri-san , 5.IX.2015, D. Kato ( BLKU)  . Paratypes: JAPAN: [Honshu] 1 male, Iwate, Hachimantai-shi, Tôshichi Spa , 5.VIII.2015, D. Kato ( BLKU)  ; [ Kyushu ] 1 male, same data as holotype except 23.VIII.2015  ; 3 males, same data as previous except 5.IX.2015  ; 1 male, 2 females, same data as previous except 15.IX.2015  .

Diagnosis. General coloration ( Fig. 37 View Figure ) fulvous to brown. Head with anterior part of vertex largely darkened, bearing silver pruinosity; palpus two segmented. Prescutum with a dark longitudinal stripe. Abdomen dark brown, sternites and genital segments paler. Male genitalia ( Fig. 14 View Figure ) with tergite 9 bearing a pair of rounded lobes at middle of posterior margin; gonostylus reniform, tip with a finger-like lobe dorsally and dense fine setae ventrally. Ovipositor ( Figs. 17–19 View Figure ) with cercus strongly curved dorsally; hypogynial valve about 1.5 times as long as sternite 8; furca broad, tip subacute, not extending beyond base of cercus.

Description. Male. Body length 3.6–4.2 mm. Wing length 5.5–6.3 mm.

Head. Fulvous to brown, anterior part of vertex largely darkened with silver pruinosity and with a pair of large nitidous areas on lateral sides, each area roughly parallelogram-shaped, about 1/2 as long as width of narrowest part of vertex, split each other by a longitudinal capillary line, sometimes decreased in size; antenna with scape and pedicel brown to dark brown, pedicel about twice as wide as basal flagellomeres, flagellomeres dark brown, without distinct pubescence; palpus two segmented, distal one shorter than basal one.

Thorax. Fulvous to brown, pleuron sometimes slightly paler; prescutum with a dark longitudinal stripe, extending posteriorly from anterior end, stripe broader anteriorly and obsolete near middle to posterior end, sometimes indistinct. Wing brownish hyaline. Legs with coxae, trochanters, and femora pale brown to brown, tibiae and tarsi dark brown, fore tibia slightly paler. Halter darkened on knob, base of the stem paler.

Abdomen. Tergites dark brown, sternite paler, male genitalia pale brown to fulvous; sternite 7 with an eggshaped dark area on the middle, without internal sac on posterior end. Male genitalia ( Fig. 14 View Figure ) with tergite 9 rounded, slightly wider than length, caudal margin with a pair of rounded lobes, each lobe about 1/5 as wide as tergite 9, interspace between lobes about equal width to that of lobe.; gonocoxite cylindrical, slightly longer than width of tergite 9, ventromesal lobe small and finger–shaped, about 1/8 as long as gonocoxite and about as long as wide; gonostylus reniform, shorter than gonocoxite, tip with black finger-like lobe on dorsal surface, the lobe directed medially, tip of ventral surface covered with dense fine setae; outer surface with a small protuberance bearing two setae near middle; paramere ( Figs. 15–16 View Figure ) with mesal-apical lobe wide, strongly curved dorsally, tip rounded and blackened; no lateral lobe of paramere; aedeagus ( Fig. 15 View Figure ) flattened, narrowed toward tip and widened at tip, disc on distal part with a longitudinal groove, tip bilobed, directed lateroventrally.

Female. Body length 3.8 –5.0 mm. Wing length 4.8–6.2 mm.

General coloration slightly different from male. Thorax darker, longitudinal stripe on prescutum broader and shorter, restricted on anterior 1/3 or less, area around prescutal pit paler. Ovipositor ( Figs. 17–19 View Figure ) pale brown to fulvous; tergite 10 in lateral view stout, more than half height of tergite 8, weakly narrowed near tip, with four to five pairs of long setae on posterior margin; cercus about as long as sternite 8, strongly curved dorsally, extending beyond tip of hypogynial valve, ventral margin with weak setae on basal 3/4; sternite 8 almost square with pair of internal ridge; hypogynial valve stout, basal part darkened and about as high as tergite 10 in lateral view, the valve about 1.5 times as long as sternite 8, tip acute; furca broad, about as long as width, not extending beyond base of cercus.

Distribution. Japan (Honshu, Kyushu ( Fig. 43 View Figure )).

Etymology. The specific epithet is based on the kidney-shaped gonostylus.

Remarks. This new species resembles D. (E.) tabashii ( Alexander, 1924)  and Limonia bagobo Alexander, 1931  , which could be closely related to the subgenus Erostrata  , but is differentiated from them by the following combination of characters: wing with cell dm closed (open in L. bagobo  ); gonostylus reniform, ventral surface with dense fine setae at tip (gradually narrowed toward tip, apex without fine setae ventrally in D. tabashii  and L. bagobo  ) ( Fig. 14 View Figure ).