Tetanocera chosenica STEYSKAL, 1951

Rozkošný, R., Knutson, L. & Merz, B., 2010, A Review Of The Korean Sciomyzidae (Diptera) With Taxonomic And Distributional Notes, Acta Zoologica Academiae Scientiarum Hungaricae 56 (4), pp. 371-382 : 378-380

Tetanocera chosenica STEYSKAL, 1951

Tetanocera chosenica was described from one male from Pusan, South Korea, by STEYSKAL (1951). We have recently seen significant additional material which confirms its occurrence in South Korea, Japan, and also in China. We can thus describe the female and variation of some characters .

Tetanocera chosenica differs from the other Palaearctic species by the following combination of characters: frons lacking glossy area but with distinct midfrontal stripe, parafacials without any dark spots (in male), aristal plumosity consisting of long setulae, mid femur with 1–3 (rarely without) posterior preapical setae, hind femur with 3 anterodorsal setae, surstylus unusually long and flat in distal part (cf. original description and STEYSKAL’ s figure).

Description of the female. Length: body 9.0–10.6 mm, wing 8.0–9.0 mm. Head yellowish brown in ground colour, frons dull, midfrontal stripe and orbits shiny, midfrontal stripe in middle about as broad as one orbit, somewhat dilated towards anterior margin. Orbits relatively short, ending at insertion of anterior orbital seta. Distance between orbital setae much shorter than that between upper orbital seta and medial vertical seta. Postocellar setae longer than lateral verticals. Upper orbital seta at level of anterior ocellus. A subtriangular brownish parafacial spot distinct between insertion of antenna and eye on each side. Antenna relatively short, pedicel distinctly longer than half length of postpedicel. Postpedicel subtriangular, arista inserted at basal third, longest aristal setulae reaching maximum width of antenna.

Thorax yellowish brown with darkened areas on scutum and pleura. A pair of blackish, broadly separated lines on scutum distinct. Upper parts of anepimeron and katepimeron as well as greater part of anepisternum more brown. Chaetotaxy as in other species of Tetanocera , no setulae on prosternum.

Wing yellowish brown, more or less infuscated along anterior margin in distal half and markedly infumated along both crossveins. Cross vein DM-Cu distinctly sinuate.

Legs ochre yellow, fore coxa with 3 anterior setae, (though middle one relatively short), mid femur with 1 anterior seta in middle and 2–3 posterior preapical setae, ventral setae absent. Hind femur with 3 anterodorsals, 1 anteroventral beyond middle and an almost complete row of 7 posteroventrals, 3 of them in middle third being longest.

Abdomen yellowish brown but somewhat paler than thorax. Tergites 3–5 each with a large, wedge-shaped, dark, mid-dorsal mark. Stronger dorsolateral setae developed only at posterior margin of tergites 5 and 6. Sternites 6–8 broadly separated by membrane. Sternites 7 and 8 unusual for the genus: sternite 7 very narrow, sternite 8 barely sclerotized, long and setose, with rounded posterior margin. Female terminalia: Hypoproct similar in shape to sternite 8, heavily setose. Two spherical spermathecae with smooth surface, flat base, no apical process and a very short, sclerotised stem.

Variation: The female is usually somewhat larger than the male, reaching the length of 9.0–10.6 mm (male 8.0–9.0 mm). The male has apparently no or only a barely distinct parafacial spot between the antenna and the eye margin. The middorsal stripe on the abdomen seems to be slightly broader and more diffuse in the male. SUEYOSHI (2001) when comparing his 6 males from Japan with the original description stated that there are 3 anterior setae on the fore coxa and three dark dorsal stripes may be developed on the scutum. However, the scutal stripes are not mentioned by STEYSKAL (1951) and not distinct in the examined male from South Korea and only two narrow lines are visible on the associated females. The examined specimens compare well with the original description except that all have 1–3 posterior preapical setae on the mid femur. STEYSKAL stressed the fact that no posterior preapical setae on the mid femur were present in his male (and this situation was confirmed by study of the holotype by L. K.). But at least one stronger although not very long such seta is present in the additional examined male from South Korea, 2 such setae are distinct in the females from the same country and 2–3 are present in other specimens examined. There is also considerable variation in the number of setae on the outer margin of the fore coxa (1–3) and number of anterodorsal (2–4) and posteroventral setae on the hind femur.

Identification: The male may be unambiguously identified by its male terminalia (see STEYSKAL 1951). But if the posterior preapical setae on the mid femur are regularly developed at least in the females, then the female is similar to two West Palaearctic species: T. latifibula FREY, 1924 and T. punctifrons RONDANI, 1868 (cf. ROZKOŠNÝ 1987). However, from the former species it can be distinguished by the much longer aristal hairs and presence of parafacial spots, and from the latter usually by 3 anterodorsal setae on the hind femur.

Distribution ( Fig. 12 ): T. chosenica was described from Fusan [= Pusan] in South Korea and recently recorded by SUEYOSHI (2001) from four localities in Japan (see his Fig. 9b ). In the same study a record in China was mentioned although without a precise locality. According to the examined specimens from several institutions this species is definitively confirmed in China from 11 localities, two additional localities from Japan and two additional localities from South Korea.

Material examined: S Korea: HOLOTYPE, Fusan [= Pusan], 11.v. (?), 1 m, G.C. STEYSKAL det., in CAS. Posok-sa , Reumsan , Malaise trap under woods, 8.–10.vi.1998, 1 f; 18.vi.1998, 1 f both P. TRIPOTIN leg., L. KNUTSON det., in MNHNP. Gangwon-do , Wonju-si , Mt. Baegunsan , 37°15.0´N, 127°57.5´E, 750–1087 m, forest, near peak, 14.vi. 2005, 1 m, 1 f MERZ, HAN, LEE & HWANG leg., R. ROZKOŠNÝ det., in MHNG and YSUW. China : Kiang-Si [= Jiangxi Prov.], Kou-ling [= Ling Kou Lu], 29°40´N, 115°52´E, 1000 m, 15.vii. 1919, 1 m, in MNHNP. Chekiang [= Zhejiang Prov.], Hangchow [= Hangzhou], 23.x.1928, 1 f Szechwan [= Sichuan Prov.], Suifu [= Yibin], 2 m, 1 f; all in USNM. [Sichuan Prov.], Chungking [= Chongqing], 1000–2000 ft, 6.–27.v.1930, 1 f [Sichuan Prov.], Kuanshien [= Guanxian] 8.–28.v.1930, 1f, 1.–14.vi.1930, 1 f [Sichuan Prov.], Chengtu [= Chengdu], 1933, 1 f, all D.C. GRAHAM leg., in USNM. Fukien [=Fujian Prov.), Kuatun, 27°40´N, 117°40´E, 2300 m, 7.iv.1938, 1 f KLAPPERICH leg., in ZFMK. [Fujian Prov.], Shaowu, Aotou, 3.x.1941, 1 f; Shaowu, Tachulan, 1000 m, 16.–18.v.1941, 1 f; 25–30.iv. 1943, 1 m; 6.–10.v. 1943, 1 m in KDG and 1 m in USNM; 26.–29.v. 1943, 1 m, T.C. MAA leg., all (except as noted) in BPBM. Yunnan Prov., 9 km S Kunming, 1 km S Bamboo Temple, wet meadow in deciduous forest, 1300–2200 m, ii.-ix. 1985, 1 m, P. OOSTERBROEK leg., in ZMAN. Japan: Kyoto, May 1953, 3 f, P. W. OMAN & W. C. BENTINCK leg., 1 f in CU and 2 f in USNM. Tharaki, Tsuchiuca, 36°05´N, 140°12´E, marsh, Malaise trap, 16.–27.x. 1989, 1 m, 1 f M. J. SHARKEY leg., in USNM. All specimens except those in MHNG were identified or revised by L. KNUTSON.

Figures

Fig. 12. Distribution of Tetanocera chosenica

Figs 7–11. Sepedon neanias, male terminalia: 7 = epandrium and surstyli in caudal view, 8 = male terminalia in lateral view, 9 = aedeagal complex in lateral view, 10 = epiphallus in anteroventral