Siphona (Aphantorhaphopsis) hongkongensis, Tachi & Shima, 2023

Tachi, Takuji & Shima, Hiroshi, 2023, Systematic study of the subgenus Aphantorhaphopsis of the genus Siphona in East Asia and the Oriental Region (Diptera: Tachinidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 63 (1), pp. 213-247 : 239-246

Siphona (Aphantorhaphopsis) hongkongensis sp. nov.

( Figs 76–80 , 98)

Type material. HOLOTYPE: J ( BPBM), HONG KONG:N.T. / Taipokau, Kowloon / 8.VI.1965 / Malaise trap // Lee Kit Ming / &Hui Wai Ming / Malaise Trap / BISHOP MUSEUM . PARATYPES: CHINA: HONG KONG:. 5 JJ 2 ♀♀, same locality as holotype, 14.iv., 31.v., 5.vi., 5.vii., 3, 6.viii., 13.ix.,1965. LAOS: 2 JJ, Ban Van Eue, Vientiane Province, 10–11. iv.1965, 15.iii.1966 (all in BPBM).

Diagnosis. Vein R 1 setulose dorsally on apical half; labella pad-like; 4 postsutural dorsocentral setae.

This species is similar to S. (A.) apicisetosa sp. nov., but is easily distinguished from it by the following characters: vertex narrow; 2nd aristomere approximately twice as long as wide; ultimate section of M 4 subequal in length to crossvein dm-m.

This species lacks certain traits commonly found in the aforementioned species groups such as shining black abdomen ( S. perispoliata group), a seta on the male pregonite ( selecta group), and long setae on the inner side of the surstylus ( S. siphonoides group).

Description. Body length 2.8–4.1 mm. Male. Head whitish in ground color; frontal vitta reddish orange; fronto-orbital plate with yellowish pruinosity; antenna with scape and pedicel reddish orange; postpedicel and arista brownish; palpus orange. Vertex approximately 0.3 of head width; parafacial subequal in width to length of 2nd aristomere at middle height; gena 0.16–0.18 of eye height; anterior reclinate orbital seta situated nearly in middle of fronto- -orbital plate; antenna with postpedicel suboval, approximately twice as long as wide, and 4.0–4.3 times as long as pedicel; 2nd aristomere approximately twice as long as wide; 3rd aristomere thickened in basal 1/4 and tapered to apex, with short pubescence; palpus clavate; prementum approximately 3 times as long as wide and approximately 0.38 times as long as eye height; labella pad-like.

Thorax. Dorsum and pleura light gray, with yellowish pruinosity. Three presutural and 4 postsutural dorsocentral setae.

Wing. Tegula blackish; basicosta orange. Relative lengths of costal sectors two, three, and four approximately 2: 9: 4; ultimate section of M

4

approximately 0.38 times lateral view; 84 – fifth abdominal sternite in ventral view (setae omitted on left side); 85 – female postabdomen in lateral view. Scale bars = 0.1 mm. (A.) perispoliata ( Mesnil, 1953) ( Hong Kong); 88 – S. (A.) coactilis sp. nov. (holotype, Malaysia); 89 – S. (A.) kanmiyai sp. nov. (holotype, Taiwan);

90 – S. (A.) laboriosa Mesnil, 1957 ( Myanmar); 91 – S. (A.) matsumotoi sp. nov. (holotype, Japan).

Figs 92–97.Adult male habitus of Siphona (Aphantorhaphopsis) spp. 92 – S. (A.) samarensis ( Villeneuve, 1921) ( Japan); 93 – S. (A.) selangor (Malloch, ► 1930) ( Hong Kong); 94 – S. (A.) alticola ( Mesnil, 1953) ( Myanmar); 95 – S. (A.) crassulata ( Mesnil, 1953) ( Myanmar); 96 – S. (A.) nepalensis sp. nov.

(holotype, Nepal); 97 – S. (A.) apicisetosa sp. nov. (holotype, Japan); 98 – S. (A.) hongkongensis sp. nov. (holotype, Hong Kong).

as long as penultimate section, and subequal in length to crossvein dm-m; R 1 setulose dorsally on apical half, bare ventrally.

Legs orange in ground color; tarsi blackish. Fore tibia with 4 anterodorsal, 3–4 posterodorsal, and 1 posterior setae; hind tibia with 4–5 anterodorsal, 3–5 posterodorsal, and 3–4 ventral setae.

Abdomen. Syntergite 1+2 and anterior 1/3–1/2 of tergite 3 yellowish; posterior 1/2–2/3 of tergite 3 and entire length of tergites 4–5 blackish; anterior 1/5 of tergite 3 and anterior half of tergites 4–5 with whitish gray pruinosity; tergites 3–5 with black longitudinal vitta. Syntergite 1+2 without distinct lateral marginal setae; tergite 3 with pair of lateral and median marginal setae; sternite 5 with pair of elongated median lobes on inner edge; apical lobes slightly extended posteriorly.

Male postabdomen. Surstylus strongly curved dorsally in apical 1/ 3 in lateral view, apex pointed; cerci tapered and pointed apically in lateral view; pregonite broadly sclerotized in lateral view and pointed apically, without seta; postgonite greatly narrowed, pointed apically; epiphallus absent; distiphallus mostly sclerotized in lateral view with many setae ventrally, apex with membranous area ventrally.

Female. Similar to male but differing as follows: gena 0.14–0.16 of eye height; antenna with postpedicel slender, 2.3–2.6 times as long as wide.

Female postabdomen. Tergite 6 divided into two small weakly sclerotized hemitergites; sternite 6 nearly square with some transparent setae on posteroventral portion; tergite 7 reduced to tall, weakly sclerotized hemitergites; sternite 7 nearly fan-shaped with some transparent setae on posteroventral portion with an anterior apodeme; spiracle 6 on tergite 6; spiracle 7 in membrane anterior to tergite 7.

Etymology. This species is named after the type locality, Hong Kong; an adjective.

Host. Unknown.

Distribution. China ( Hong Kong), Laos.

Figures

Figs 76–80. Male and female postabdomen of Siphona (Aphantorhaphopsis) hongkongensis sp. nov. (paratypes, Hong Kong). 76 – epandrium, cerci and surstylus in lateral view; 77 – epandrium, cerci and surstylus in dorsal view (setae omitted on left side); 78 – hypandrium, pregonite, postgonite and phallus in lateral view. 79 – fifth abdominal sternite in ventral view (setae omitted on left side); 80 – female postabdomen in lateral view. Scale bars = 0.1 mm.