Dichetophora koreana, Son & Suh, 2021

Son, Yeongjin & Suh, Sang Jae, 2021, First record of the snail-killing fly genus Dichetophora Rondani (Diptera: Sciomyzidae) in Korea, with descriptions of two new species, Zootaxa 5068 (1), pp. 125-132 : 126-129

publication ID	https://doi.org/ 10.11646/zootaxa.5068.1.6
publication LSID	lsid:zoobank.org:pub:E2418100-CECA-4005-B1B9-910416BF8ACC
DOI	https://doi.org/10.5281/zenodo.5706165
persistent identifier	https://treatment.plazi.org/id/516AB85A-7E20-9773-94E1-FEA8FA3DFE7C
treatment provided by	Plazi
scientific name	Dichetophora koreana
status	sp. nov.

Treatment

Dichetophora koreana View in CoL sp. nov.

( Figs. 1–2 View FIGURE 1 View FIGURE 2 )

Diagnosis. Body ground color yellow; occiput whitish yellow with numerous setae; 1 black spot at base of anterior fronto-orbital seta; all tarsi brownish black; wing with numerous square hyaline spots; 2 pairs of scutellar setae; apex of the cercus narrowly protruded, with some setae; knifelike surstylus long, narrow, ventral apex asymmetrically rounded, knob-like projection at basal margin bulge in lateral view.

Description (male). Head ( Fig. 1A–C View FIGURE 1 ). Yellowish and shining; mid frontal stripe reaching anterior margin of frons; narrow fronto-orbital margin silver; ocellar triangle brown; occiput yellow with darker median area bordered by narrow whitish pruinescent stripes and with setae laterally; cluster of stout setae in middle of median area; round black spot at base of anterior fronto-orbital seta; face yellowish brown with white pruinescence; orbito-antennal spot large, black; lunule shining brown with black setulae; antenna porrect, yellowish brown; postpedicel slightly shorter than pedicel, covered with whitish setulae; arista yellowish white pubescent; pedicel about 6 times as long as scape; scape yellow, with setae on dorsal margin; gena white from ventral margin of eye halfway to oral margin, yellow in ventral half; palpus yellow with long black setae; 2 fronto-orbital, 1 postocellar, 1 inner vertical, and 1 outer vertical setae; ocellar seta absent.

Thorax ( Fig. 1C–D View FIGURE 1 ). Yellowish brown; scutum covered with white setulae and short black setae; 2 dark-brown median vittae and 2 broken dark brown lateral vittae on scutum; 1 dorsocentral, 2 scutellar, 1 postpronotal, 1 supraalar, 2 postalar, and 2 notopleural setae present; presternum, anepisternum, anepimeron, meron, and katatergite bare, katepisternum entirely covered with black setulae; anterior and posterior spiracles yellow.

Wing ( Fig. 1E View FIGURE 1 ). Yellowish with numerous poorly defined yellowish square and sub-square spots; most veins yellowish; posterior 2/3 of crossvein r-m and adjacent area of vein M 1 with large subtriangular black spot, crossvein dm-m slightly S-shaped; apical half of vein R 4+5 blackish; costal vein hyaline yellow; 6–7 black spots in cell r 1; alula and anal cells immaculate; pale black spots in cell m 4; 2 pale black spots on cell br; veins R 4+5 and M 1 very slightly convergent at apex; halter yellow.

Leg ( Fig. 1C View FIGURE 1 ). Generally yellowish brown; all tarsi black and brown; all coxae with cluster of long setae at ventral apex; fore and mid coxae yellowish white; mid coxa yellow with cluster of long setae at ventral apex; hind coxa brown with 1 anterodorsal seta and with cluster of long setae at ventral apex; fore femur yellow basally, becoming brown apically; mid femur with dorsal spines on apical 1/3; hind femur with dorsal spines; fore and hind femora darkened at the dorsal apex; foretibia darkened at apex; hind tibia with blackish annulation at apex.

Abdomen ( Fig. 1C View FIGURE 1 , Fig. 2 View FIGURE 2 ). Yellowish brown; tergites 2–4 darkish brown with black linear lateral stripe; sternites 2–4 with long setae at the posterior apex; sternite 5 divided, with cluster of short setae and 4–5 pairs of long setae on each side; syntergosternite 6 asymmetric, the left side larger than the right side in posterior view; syntergosternite 7+8 setose on posterior half; epandrium suboval in posterior view and taller than syntergosternite 7+ 8 in lateral view; apex of the cercus narrowly protruded, with some setae; knifelike surstylus long, narrow, ventral apex asymmetrically rounded; knob-like projection at basal margin setulose, slightly protruding and bulge in lateral view; posterior process of pregonite sharply pointed; distiphallus asymmetric, left side with two pointed structures, right side with single small rounded structure with hyaline membranous center in posterior view, one curved structure in left view; basiphallus trapezoidal in posterior view.

Female. Similar to male but larger, with all body patterns more sharply defined than in male; postpedicel with pale black spot; veins hyaline yellow except posterior half of vein R 4+5 vein black; apex of fore tibia darker than in male; mid femur with brown annular ring at distal apex; tarsus all black; sternites with inner brown and outer yellow stripes; tergite 10 and cercus with pairs of long setae, distinctly separated from sternite 10.

Body length: male: 10.3–10.4 mm, female: 12.4–12.6 mm.

Wing length: male: 8.5–8.6 mm, female: 10–11 mm.

Type material. Holotype: male, Mt. Guryongsan , Sangdong-eup , Yeongwol-gun, Gangwon-do, 37°07′16″N 128°48′54″E, 24.VII.2018, S.J. Suh GoogleMaps . Paratypes: 1 female, Mt. Duwibong, Nam-myeon, Jeongseon-gun , Gangwondo, 37°14′10″N 128°45′35″E, 02.IX.2018, S.J. Suh GoogleMaps ; 1 male, Mt. Majeongsan, Gunwi-eup, Gunwi-gun , Gyeongsangbuk-do, 36°13′38″N 128°34′35″E, 27. VI.2016, S.J. Suh GoogleMaps ; 1 female, Sango-ri, Hwabuk-myeon, Sangju-si , Gyeongsangbuk-do, 36°32′17″N 127°53′54″, 25. VI.2018, S.J. Suh ; 1 female, Mt. Cheonhwangsan, Sannae-my- eon, Miryang-si , Gyeongsangnam-do, 35°34′29″N 128°59′12″E, 30.IX.1984, S.J. Suh GoogleMaps ; 1 female, Mt. Hwawangsan, Okcheon-ri, Changnyeong-eup , Changnyeong-gun , Gyeongsangnam-do, 35°32′46.7″N 128°32′23.9″E, 08.X.2020, S.J. Suh GoogleMaps ; 2 females, Mt. Baekgolsan, Biin-myeon, Seocheon-gun , Chungcheongnam-do, 36°09′37″N 126°38′15″E, 05.IX.2020, S.J. Suh GoogleMaps .

Distribution. Korea (Central and Southern, new record).

Remarks. The new species, Dichetophora koreana sp.nov., is similar to D. japonica and D. meleagris in having two pairs of scutellar setae ( Fig. 1D View FIGURE 1 ). However, this species is distinguished from D. japonica by the following features: body and occiput yellow, larger size (10.3–12.6 mm), different wing pattern ( Fig. 1E View FIGURE 1 ), and different male postabdominal structures ( Fig. 2 View FIGURE 2 ). Dichetophora koreana differs from D. meleagris by the yellow femora ( Fig. 1C View FIGURE 1 ), the shape of the knob-like projection at the basal margin of the surstylus ( Fig. 2B View FIGURE 2 ), and the structure of sternite 5 ( Fig. 2G View FIGURE 2 ). The new species is distinguished from the Palearctic species D. finlandica , D. kumadori , and D. obliterata by the presence of two pairs of scutellar setae ( Fig. 1D View FIGURE 1 ) and the different structure of the sternite 5 ( Fig. 2G View FIGURE 2 ).