Phyllomya sichuana Shima & Zhang & Tachi 2022, sp. nov.
Creators: name: Shima, Hiroshi
name: Zhang, Wenxia
name: Tachi, Takuji
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Phyllomya
Phyllomya sichuana

description: Phyllomya sichuana Shima & Zhang, sp. nov.
(Figs 1–2, 87–90, 98, 121–122, 126, 151–152)
Diagnosis. Head dichoptic; no proclinate orbital setae in male, 2 in female; lower portion of fronto-orbital plate with 1–2 rows of rather sparse, fine, short, white hairs descending to upper 3/4 of parafacial; arista short plumose; thoracic pleura with whitish hairs; 1 presutural and 1 postsutural acrostichal setae; 2 presutural and 3 postsutural dorsocentral setae; 2 katepisternal setae; mid tibia with 1 anterodorsal seta; hind tibia with 3 preapical dorsal setae; male claws and pulvilli longer than 5th tarsomere; costa haired above and below; abdominal venter with pale yellowish-white hairs broadly on 1st sternite and ventromedian portion of syntergite 1+2 to 4th tergite.
Description. Body length: 6.2–10.0 mm.
Male. Head dichoptic, with dense, silvery-white pruinosity, upper fronto-orbital plate slightly grayish, upper occiput grayish; antenna black except dark brown arista; palpus black. Vertex 0.25–0.26 of head width; parafacial slightly narrowed below, subequal in width to postpedicel at mid height; gena about 0.4 of eye height. Inner vertical seta 4/5 as long as eye height; outer vertical seta absent; 1 outwardly-directed prevertical seta, about 3/4 as long as inner vertical seta; no proclinate orbital setae; 7–9 frontal setae; fronto-orbital plate with a few fine, black hairs on upper portion and 1–2 rows of rather sparse, fine, short, white hairs, the latter descending to upper 3/4 of parafacial; gena with a row of fine, short, white hairs on lower margin; postocular setae rather strong on upper portion, not close to posterior eye margin; occiput with several black hairs on upper portion and dense white pile. Base of antenna slightly above level of lower 1/3 of eye height; antenna falling short of lower margin of face by about 1/3 length of pedicel; pedicel with a long seta about twice as long as pedicel; postpedicel long, 3.5–4.0 times as long as pedicel; arista short plumose, total width including plumosity at most 1/2 as wide as postpedicel. Palpus about 4/5 as long as postpedicel. Eye almost bare.
Thorax black, with thin, grayish-white pruinosity on dorsum and rather dense pruinosity on pleura; dorsum with 3 broad longitudinal vittae on presutural area, fused with each other on anterior 2/3, and with a broad median vitta on postsutural scutum. One presutural and 1 postsutural acrostichal seta; 2 presutural and 3 postsutural dorsocentral setae; 2 postsutural intra-alar setae; scutellum with 3 pairs of marginal setae, basal setae as long as scutellum or slightly longer, apical setae about twice as long as scutellum; 2 katepisternal setae; lateral portion of postpronotal lobe and pleura with whitish hairs. Wing evenly and weakly tinged with pale brown; lower calypter translucent white; costa haired above and below; costal spine indistinct; relative lengths of costal sectors 2, 3 and 4 approximately 1.5:4.5:2; bend of vein M 1 about 1.5 times closer to wing margin than to dm-cu crossvein; last section of vein CuA 1 about 2/3 as long as dm-cu crossvein. Legs black, coxae with rather dense, grayish-white pruinosity; pulvilli pale brown; fore tibia with 3–4 anterodorsal and 2 posterior setae; mid tibia with 1 anterodorsal, 2 posterodorsal and 1 ventral setae; hind tibia with 3 preapical dorsal setae; claws and pulvilli longer than 5th tarsomere.
Abdomen nearly cylindrical, black, dorsum with dense, grayish-white pruinosity on anterior 1/2 of 3rd tergite, 2/5 of 4th and 1/3 of 5th tergites, pruinose band interrupted by broad median longitudinal vitta, venter with broader and thinner pruinosity. Hairs on dorsum black, pale yellowish-white on 1st sternite and ventromedian portion of syntergite 1+2 to 4th tergite; syntergite 1+2 with a pair of median discal setae, a pair of median marginal setae and a single lateral discal and lateral marginal seta on each side; 3rd to 5th tergites each with a pair of median discal setae and a row of marginal setae, lateral discal setae absent; 5th sternite with dense, black hairs mixed with pale yellowish hairs on median longitudinal area, postero-interior corner of posterior lobe sharply pointed. Terminalia: Sixth tergite entire, strongly constricted mid-dorsally, without hairs; surstylus slender, evenly narrowed to apex, with several long hairs; cerci in dorsal view rather slender, narrowed to apex, mid-dorsal suture very weak along basal 1/3 and distinct apically, in lateral view weakly constricted at basal 2/5, apical portion weakly curved ventrally; pregonite weakly pointed near middle; postgonite not extending beyond apex of epiphallus; dorsal sclerite of distiphallus curved dorsally at apex, apical membranous portion only slightly shorter than dorsal sclerite.
Female. Closely resembling male, but differing as follows: Vertex wider, 0.29–0.32 of head width; outer vertical seta about 1/2 as long as inner vertical seta; 2 proclinate orbital setae, anterior seta stronger and about 2/3 as long as inner vertical seta; antenna shorter, falling short of lower margin of face by about length of pedicel, postpedicel about 3.5 times as long as pedicel; mid tibia usually with 2 anterodorsal setae, rarely 3; claws and pulvilli shorter than 5th tarsomere; abdomen fusiform, with thinner pruinosity, dorsum of 3rd and 4th tergites with whitish pruinosity on anterolateral 1/2–1/3 and 5th tergite without pruinosity; whitish hairs on abdominal venter confined to 1st sternite, ventromedian portion of syntergite 1+2 and narrow anteroventral portion of 3rd tergite. Terminalia: Sixth tergite divided into 2 rather small hemitergites, each with a row of strong setae on posterior margin; 6th sternite long, with whitish hairs mixed with black hairs on posterior portion; 7th tergite divided into rectangular hemitergites, with a few rather long hairs on posterior portion; 7th sternite shorter than 6th, with whitish hairs, mixed with black hairs, on posterior portion; 8th hemitergite short, narrowly fused with hypoproct near middle, curved anteriorly on posterior portion; 8th sternite slightly shorter than 6th.
First instar larva: Body length 0.85–0.95 mm; cephaloskeleton rather broad on apical 1/2, dorsal margin nearly smooth; 2nd thoracic segment with 4–5 anterodorsal rows of fine spinules; 2nd to 6th abdominal segments each with 4–5 posteroventral rows of short fine spinules, 7th segment without posterolateral spinules.
Type material. Holotype ♂: CHINA / Sichuan, Kanding / Xiang, Zheduo Shan / 3000 m, 19–24.viii. / 1993, H. Shima (IZCAS).
Paratypes: China, Sichuan: 1 ♂, 1 ♀, Jiuzhaigou, Daoban, 2400 m, 3.viii.1993, H. Shima (IZCAS); 2 ♂♂, 1 ♀, Songfan Xian, Huanlong, 7.viii.1993, H. Shima (IZCAS); 4 ♂♂, 6 ♀♀, Kanding Xiang, Yulin, 20.viii.1993, H. Shima & W. Zhang (KUM); 28 ♂♂, 39 ♀♀, same locality and data as holotype, H. Shima, W. Zhang & A. Nakanishi (BLKU, IZCAS, KUM).
Etymology. The specific name is derived from Sichuan, the Chinese province in which this species was discovered.
Distribution. China (Sichuan).
Remarks. This species very closely resembles the Japanese species P. takanoi, but can be distinguished from it by the wider gena, mid tibia with only 1 anterodorsal seta in the male and 2 in the female, abdominal venter (and 5th sternite) broadly with whitish hairs and basal scutellar setae weak but distinct.
description: Published as part of Shima, Hiroshi, Zhang, Wenxia & Tachi, Takuji, 2022, A systematic study of Old World Phyllomya Robineau-Desvoidy (Diptera: Tachinidae), pp. 401-449 in Zootaxa 5099 (4) on pages 436-440, DOI: 10.11646/zootaxa.5099.4.1, http://zenodo.org/record/6091813