Siphona (Aphantorhaphopsis) matsumotoi, 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 : 235-238

Siphona (Aphantorhaphopsis) orientalis ( Townsend, 1926) ( Figs 63–66 )

Aphantorhaphopsis orientalis Townsend, 1926: 35 . Type locality: Indonesia, Sumatra.

Ceromya orientalis : CROSSKEY (1976: 213), CROSSKEY (1977: 645).

Siphona (Aphantorhaphopsis) orientalis : O’HARA (1989: 96), O’HARA et al. (2020: 799).

Type material examined. HOLOTYPE: J ( ZMU), Fort de Kock / (Sumatra)

920 M. / 1925 / leg. E. Jacobson.

Additional material examined. TAIWAN: TAIPEI- HS.: 1 J, Yehliu beach, Wanli-hsiang, 27.xi.1997, M. Sueyoshi; 2 JJ 1 ♀, Fushan

(400–600 m), Wulai-hsiang, 28.xi.1997 (Malaise trap), K. Masunaga,

K. Yoshizawa & T. Saigusa. NANTO- HS.: 1 ♀, Tungyenchi (950 m),

Meichi, Jenai-hsiang, 19.xi.1997, T. Saigusa; 1 J, Lienhauchi, 500–550

m, 28.iv.1981, H. Takemoto; 1 ♀, Nanshanchi 600 m, 22–23.iv.1981, H.

Takemoto; 1 ♀, Meifeng-tsuigeng 2200–2300 m, 27.iv.1981, K. Ohara

(all in KUM).

Diagnosis. Fronto-orbital plate with yellowish pruinosity, bearing a row of short setae on lower part; frontal vitta orange or light yellow; 3 postsutural dorsocentral setae; male postabdomen with surstylus nearly straight and tapered to apex in lateral view.

Taiwanese specimens examined in this study correspond well to the type of Aphantorhaphopsis orientalis , and thus we treat them as conspecific. This species is similar to S. (A.) matsumotoi sp. nov. in general appearance but differs from it in the male postabdomen: surstylus nearly straight and tapered in lateral view; cerci somewhat thickened in apical half in lateral view; pregonite with one short dorsal seta.

Redescription. Male. Body length 3.6–4.0 mm. Head whitish in ground color; fronto-orbital plate with yellowish pruinosity; frontal vitta orange; antenna with scape, pedicel, and basal half of arista reddish yellow; postpedicel brownish; apical half of arista blackish; palpus pale yellow. Vertex approximately 0.32 of head width; parafacial narrower than width of 2nd aristomere at middle height; gena 0.16–0.20 of eye height; anterior reclinate orbital seta situated posterior to middle of fronto-orbital plate; fronto-orbital plate with a row of short setae; antenna with postpedicel subrectangular, approximately 2.7 times as long as wide, and approximately 4 times as long as pedicel; 2nd aristomere approximately twice as long as wide; 3rd aristomere thickened in basal 1/3; palpus somewhat clavate; prementum approximately 4 times as long as wide and 0.4–0.5 times as long as eye height; labella pad-like.

Thorax. Dorsum gray in ground color, with yellowish pruinosity; postpronotal lobe with whitish pruinosity; apical half of scutellum yellowish; pleura brownish, with whitish gray pruinosity. Three presutural and 3 postsutural dorsocentral setae.

Wing. Tegula blackish; basicosta light yellow. Relative lengths of costal sectors two, three, and four approximately 2: 10.5: 5; ultimate section of M

4

approximately 0.36 times as long as penultimate section, and 1.0–1.2 times as long as crossvein dm-m; R

1

bare.

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

Abdomen yellowish in ground color, with whitish pruinosity on anterior 1/5–1/6 on each tergite; tergites 3–5 with black median longitudinal vitta; posterior half of tergites 4–5 blackish. Syntergite 1+2 with a pair of lateral marginal setae; tergite 3 with pair of lateral and median marginal setae; sternite 5 with pair of relatively rounded median lobes on inner edge.

Male postabdomen. Surstylus nearly straight and tapered to apex in lateral view; cerci somewhat thickened in apical half in lateral view, apex strongly curved ventrally and rounded; pregonite somewhat pointed ventrally in lateral view, with one short dorsal seta; postgonite rounded apically; epiphallus absent; distiphallus mostly sclerotized in lateral view with some spinules ventrally.

Female. Differing from male as follows: gena slightly narrow, approximately 0.15 of eye height; antenna with postpedicel slender, approximately 3 times as long as wide.

Host. Unknown.

Distribution. Indonesia (Sumatra), Taiwan (Nanto, Taipei)* ( O’HARA et al. 2020).

Figures

Figs 63–66. Male postabdomen of Siphona (Aphantorhaphopsis) orientalis (Townsend, 1926) (Taiwan, Taipei). 63 – epandrium, cerci and surstylus in lateral view; 64 – epandrium, cerci and surstylus in dorsal view (setae omitted on left side); 65 – hypandrium, pregonite, postgonite and phallus in lateral view; 66 – fifth abdominal sternite in ventral view (setae omitted on left side). Scale bars = 0.1 mm.