Drosophila (Sophophora) xitouensis Katoh & Watada, 2025
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publication ID |
https://doi.org/10.11646/zootaxa.5661.4.8 |
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publication LSID |
lsid:zoobank.org:pub:79E4289A-A7E8-407A-B5C7-B6FD5321E8E2 |
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DOI |
https://doi.org/10.5281/zenodo.16606221 |
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persistent identifier |
https://treatment.plazi.org/id/039387D2-FF8B-B075-21EA-FF412D4E7381 |
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treatment provided by |
Plazi |
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scientific name |
Drosophila (Sophophora) xitouensis Katoh & Watada |
| status |
sp. nov. |
Drosophila (Sophophora) xitouensis Katoh & Watada , sp. nov.
( Figs 2C, E View FIGURE 2 , 5 View FIGURE 5 )
Diagnosis: Median gonocoxite process large, broad, apically only shallowly concaved ( Fig. 2C View FIGURE 2 ). Aedeagus pubescent, subapically hairy, without lateral acute projections ( Fig. 2E View FIGURE 2 ).
Description (♂, ♀). Head: Eye red, with interfacetal setulae. Frons brown. Fronto-orbital plate pale brown. Frontal triangle reddish brown. Facial carina brown, high, narrow. Clypeus grayish brown. Gena pale brown. Palpus grayish brown, with a terminal prominent seta. Prementum and postgena brown. Occiput brown, marginally darker. Antennal pedicel brown; first flagellomere grayish brown; arista with 4–5 dorsal and 2–3 ventral branches and moderate terminal bifurcation.
Thorax: Scutum and scutellum dark brown, somewhat paler along dorsocentral lines. Acrostichal setulae in 6 rows. Postpronotal lobe pale brown, with 2 setae. Anepisternum and anepimeron dark brown, paler above. Katepisternum brown.
Wing hyaline. Veins brown. C 1 setae 2. R 2+3 straight; R 4+5 and M 1 nearly parallel. Halter pale brown.
Legs yellowish brown; femora pale yellow. Preapical dorsal setae present on tibiae of all legs, weak on fore- and hind-legs; apical ventral setae on fore- and mid-tibiae. Male fore-leg with 2 longitudinal sex combs on tarsomeres I and II; sex comb teeth 24 (20–26) on tarsomere I, 20 (17–24) on tarsomere II. Fore-leg tarsomere I twice length of tarsomere II; tarsomere II half of rest together; tarsomere Is of mid- and hind-legs as long as rest together.
Abdomen: Tergites yellowish brown, each with caudal dark brown band. Sternites pale brown.
Male terminalia ( Figs 2C, E View FIGURE 2 , 5A–C View FIGURE 5 ): Epandrium black, paler below, with 5–7 setae on dorsal to lateral part; ventral portion with 5–9 setae. Surstylus dark brown, triangular, fused to epandrium, with 8–10 short peg-like teeth in a row on nearly caudal margin, and a cluster of 3–4 short and 1 long, stout setae on inner margin. Cercus black, separated from epandrium, not pubescent, triangular, with 13–16 setae on lateral surface and 3 large, black, stout spines on margin to ventral lobe; ventral lobe, quadrate, bearing 2 large and 1 small, black, stout, ventrally curved spines on posterior margin, 1 strong spine on inner margin, and 4–5 setae on lower margin. Subepandrial sclerite dark brown, pointed at dorso-lateral apices. Hypandrium brown, longer than wide, pubescent on caudal portion of gonocoxites; median gonocoxite process subapically with a pair of spines. Pregonite brown, hemispherical, each with 2 or 3 sensilla. Postgonal sheaths pale brown, elongate, curved outward, apically finely serrated. Aedeagus long, apically rounded, basally fused to phallapodeme; phallapodeme as long as aedeagus. Ejaculatory apodeme with rounded square plate notched at 2 points of apical side; stem of apodeme slender, somewhat sinuate.
Female terminalia: Hypogynium ( Fig. 5D View FIGURE 5 ) dark orange brown, subapically broadened, apically quadrate, with 13–15 peg-like teeth on posterior to ventral margin and 1 trichoid sensillum subapically. Spermathecal capsule atrophied, less sclerotized.
Measurements: BL = 2.62 mm in holotype (paratypes: 2.24–2.56 in 10 ♂, 2.46–3.03 in 10 ♀); ThL = 1.01 mm (0.96–1.11 in ♂, 1.10–1.23 in ♀); WL = 1.99 mm (1.90–2.09 in ♂, 2.21–2.41 in ♀); WW = 0.94 mm (0.90–1.02 in ♂, 1.00– 1. 14 in ♀).
Indices: FW/HW = 0.44 (0.41–0.46), ch/o = 0.09 (0.06–0.11), prorb = 1.00 (0.74–1.17), rcorb = 0.36 (0.23– 0.40), vb = 0.83 (0.62–0.88), dcl = 0.69 (0.61–0.78), sctl = 0.91 (0.84–1.10), sterno = 0.54 (0.50–0.67), sterno2 = 0.28 (0.31–0.53), orbito = 0.70 (0.58–0.80), dcp = 0.46 (0.39–0.53), sctlp = 1.43 (1.09–1.50), C = 3.04 (2.58–3.32), 4c = 1.01 (0.96–1.26), 4v = 2.25 (2.24–2.63), 5x = 2.43 (2.07–3.00), ac = 2.09 (2.08–2.50), M = 0.77 (0.71–0.95), C3F = 0.35 (0.28–0.44).
Holotype: ♂, from iso-female line (XT-32) originated from a wild-caught female collected in Xitou , Taiwan, 19.vi.2012, by M. Watada ( NTUM).
Paratypes: 9 ♂ and 10 ♀, same data as holotype ( SEHU, NTUM) .
Etymology: Pertaining to the geographical origin of the type strain.
Distribution: Taiwan.
Relationships: This species clearly belongs to the montium species group in light of their morphological characteristics such as the sex-combs of longitudinal rows along entire length of tarsomeres I and II of male fore-leg and male genital structures, and according to Yassin’s (2018) classification, is assigned to the montium species group. This species resembles D. trapezifrons in having the pubescent aedeagus and the large median gonocoxite, but can be distinguished from it by the absence of black acute lateral projections on the aedeagus ( Fig. 2C–F View FIGURE 2 ). Combinations of some quantitative characters can be used to discriminate this species from D. trapezifrons (Table 3). In addition, D. neotrapezifrons Ragnath, Krishnamurthy & Hegde, 1983 which resembles D. trapezifrons could also be a closely related species of D. xitouensis , however, can easily be distinguished from D. xitouensis by having eight irregular rows of acrostichal setulae and naked aedeagus.
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