Siphona (Aphantorhaphopsis) apicisetosa, 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 : 238-239

Siphona (Aphantorhaphopsis) apicisetosa sp. nov.

( Figs 67–71 , 97)

Type material. HOLOTYPE: J ( BLKU), HOKKAIDO / Mt. Rausu / (200–900 m.) // 4.VIII.1967 / T. Saigusa . PARATYPES. JAPAN: HONSHU: 1 ♀, Mt. Kitadake, Yamanashi Prefecture, 28.viii.1980, T. Goto; 1 J, no locality, 2.vi.1975, T. Saigusa (both in KUM).

Diagnosis. Vein R 1 with 1–3 setae dorsally on apical portion; labella pad-like; abdomen gray in ground color; 4 postsutural dorsocentral setae.

This species is similar to S. (A.) hongkongensis sp. nov., but differs from it in the male postabdomen: surstylus nearly straight in lateral view; cerci curved dorsally in middle in lateral view; postgonite truncated apically; epiphallus present. The male surstylus and pregonite are bare, and the female abdominal tergite 8 is not fused in this species. These characteristics are not found in any species group.

Description. Body length 4.5–4.7 mm. Male. Head yellowish in ground color; fronto-orbital plate with golden pruinosity; frontal vitta orange; antenna with scape and pedicel orange; postpedicel brownish; arista dark brown; palpus orange. Vertex approximately 0.4 of head width; parafacial approximately twice as wide as length of 2nd aristomere at middle height; gena approximately 0.18 of eye height; anterior reclinate orbital seta situated posterior to middle of fronto-orbital plate; antenna with postpedicel suboval, approximately 1.4 times as long as wide, and approximately 5 times as long as pedicel; 2nd aristomere approximately 4 times as long as wide; 3rd aristomere thickened in basal half; palpus clavate; prementum approximately 3 times as long as wide and approximately 0.43 times as long as eye height; labella pad-like.

Thorax. Dorsum gray in ground color, with yellowish pruinosity; postpronotal lobe with whitish pruinosity; pleura brown, with whitish-gray pruinosity. Three presutural and 4 postsutural dorsocentral setae; scutellum with pair of discal setae.

Wing. Tegula reddish brown to brown; basicosta light yellow. Relative lengths of costal sectors two, three, and four approximately 1: 6: 3.5; ultimate section of M 4 approximately 0.5 times as long as penultimate section, and approximately 1.5 times as long as crossvein dm-m; R 1 with 1–3 setulae dorsally on apical portion, bare ventrally; M

4

bare.

Legs yellowish in ground color; tarsi blackish. Fore tibia with 2–3 anterodorsal, 3–4 posterodorsal, and 1 posterior setae; hind tibia with 3–5 anterodorsal, 2 posterodorsal, and 3 ventral setae.

Abdomen gray in ground color, clothed with whitish gray pruinosity. Syntergite 1+2 with pair of lateral marginal setae; tergite 3 with pair of lateral and median marginal setae; sternite 5 with pair of elongate median lobes on inner edge.

Male postabdomen. Surstylus nearly straight and slightly narrowed apically in lateral view, apex slightly curved dorsally; cerci curved dorsally in middle in lateral view, apex somewhat pointed and curved ventrally; pregonite narrowed in apical half in lateral view, without seta; postgonite weakly curved ventrally and truncated apically; epiphallus present, slightly curved posteriorly and pointed apically; distiphallus broadly sclerotized in lateral view with some spinules ventrally.

Female. Differing from male as follows: antenna with postpedicel slender, approximately 2.5 as long as wide.

Female postabdomen. Tergite 6 elongate, weakly sclerotized; sternite 6 nearly square with some transparent setae; tergite 7 small, weakly sclerotized; sternite 7 with long anterior apodeme; spiracle 6 present on tergite 6; spiracle 7 in membrane anterior to tergite 7.

Etymology. This specific name is based on one of the features, R 1 with 1–3 setae dorsally on the apical part; an adjective.

Host. Unknown.

Distribution. Japan (Hokkaido, Honshu).

Figures

Figs 67–71.Male and female postabdomen of Siphona (Aphantorhaphopsis) apicisetosa sp. nov. (paratypes, Japan, Hokkaido). 67 – epandrium, cerci and surstylus in lateral view; 68 – epandrium, cerci and surstylus in dorsal view (setae omitted on left side); 69 – hypandrium, pregonite, postgonite and phallus in lateral view; 70 – fifth abdominal sternite in ventral view (setae omitted on left side); 71 – female postabdomen in lateral view. Scale bars = 0.1 mm.