Dettopsomyia acutipenis Wang & Gao, 2021

Wang, Ya-Lian, Li, Qiao, Toda, Masanori J. & Gao, Jian-Jun, 2021, The genus Dettopsomyia Lamb, 1914 (Diptera, Drosophilidae) from southern China, ZooKeys 1056, pp. 73-94 : 73

Dettopsomyia acutipenis Wang & Gao sp. nov.

Figure 4

Material.

Holotype ♂ (#00151), Yunnan: Xishuangbanna Tropical Botanical Garden, the Chinese Academy of Sciences, Menglun , Mengla , Xishuangbanna , ca. 570 m (21.92°N, 101.28°E), 19.iii.2006, ex flower of Zinger sp. (M.J. Toda) (KIZ) . Paratypes China: 7♀ (#00380-386), the data same as holotype except for 18.vi.2007 (J.J. Gao) ; 3♀ (#00387-389), the data same as holotype except for 16.vi.2007 (J.J. Gao) (KIZ) .

Diagnosis.

This species differs in CS-code (Ab??efGHiJklM) from all the remaining congeneric species, except for De. fruhstorferi (?????fG?iJk?? according to Okada, 1982), which is, however, distinguished from the new species by the number of dark, longitudinal stripes on scutum: six in the new species, but ten in De. fruhstorferi .

Description.

(♂, ♀). Head (Fig. 4A, B ): Eye red, much oblique to body axis, with dense interfacetal setulae. Ocellar triangle matte black. Ocellar setae located outside triangle made by ocelli. Fronto-orbital plate anteriorly with a black spot at the base of proclinate and anterior reclinate orbital setae. Frons grayish yellow, with pale brown stripes. Face yellow; carina large, ventrally with blackish brown, T-shaped spot. Clypeus black. Gena yellowish brown, with dark stripe along ventral margin. Palpus yellow. Pedicel (2nd antennal segment) yellow, laterally with black spot; 1st flagellomere (3rd antennal segment) grayish yellow.

Thorax (Fig. 4A, B ): Scutum, scutellum, and thoracic pleura yellowish brown; scutellum apically white. Scutum with six blackish brown stripes; median pair close to each other. Scutellum medially with X-shaped, dark marking posteriorly covering the bases of apical scutellar setae, laterally with dark spots at the bases of basal scutellar setae. Thoracic pleura with three blackish, longitudinal stripes. Acrostichal long setae absent; acrostichal setulae in four rows. Dorsocentral setae three pairs. Basal scutellar setae slightly divergent; apical scutellar setae cruciate.

Wing (Fig. 4C ): Wing pale yellow. Veins yellowish brown. Costal lappet black, moderate in size. R2+3 curved to costa apically; R4+5 and M1 slightly diverged from each other distally. Haltere pale yellow, ventrally with small grayish patch; stalk slightly grayish.

Legs (Fig. 4A ): Legs yellow: femora and tibiae ringed.

Abdomen (Fig. 4D, E ): Tergites yellow, posteriorly with narrow, blackish brown, dorsomedially interrupted bands, which bend forward laterally, and with an isolated black spot on lateral margin.

Male terminalia (Fig. 4F-I ): Epandrium pubescent except for anterior margin and ventral portion, with five setae per side on ventral portion and triangular, distally somewhat roundish apodeme on antero-dorsal to -sublateral margin, slightly protruded anteriad at anteroventral corner. Surstylus broadly fused to epandrium; distal margin with a row of 12 or 13 peg-like, apically pointed prensisetae, which are more loosely arranged dorsally; outer surface with six or seven long, trichoid setae on subdorsal to ventral portion; caudoventral apex with a few short, trichoid setae. Cercus oblong, wider than 1/2 length, partially fused to epandrium, caudoventrally pointed, pubescent except for anteroventral margin, with approximately 17 setae. Hypandrium somewhat triangular, with a pair of minute setae (paramedian setae?), caudomedially deeply notched and revolute along inner edges, with large patches of pubescence on the revolute parts. Aedeagus apically acute, slightly curved dorsad, basally with recurved, dorsal flap; aedeagal guide broadly fused to revolute portion of hypandrium; apodeme fused to aedeagus, rod-like, <1/3 length of aedeagus.

Female terminalia (Fig. 4J-L ): Oviscapt with single lateral and 13 or 14 marginal, apically more or less pointed, peg-like ovisensilla, and one subterminal, trichoid seta; anteroventral bridge short. Spermatheca somewhat fusiform, basally ridged; introvert ca. 1/4 height of outer capsule.

Measurements: BL (straight distance from anterior edge of pedicel to tip of abdomen) = 1.69 mm in holotype (range in 9♀ paratypes: 1.42-2.18 mm); ThL (distance from anterior notal margin to apex of scutellum) = 0.71 (0.62-0.74) mm; WL (distance from humeral cross vein to wing apex) = 1.46 (1.40-1.60) mm; WW (maximum wing width) = 0.73 (0.67-0.86) mm.

Indices: arb (dorsal branches/ventral branches of arista) = 3/2 in holotype (range in 9♀, or less if noted, paratypes: 3-4/2), FW/HW (frontal width/head width) = 0.59 (0.57-0.61), ch/o (maximum width of gena/maximum diameter of eye) = 0.42 (0.41-0.51), prorb (proclinate orbital seta/posterior reclinate orbital seta in length) = 0.70 (0.53-0.70), rcorb (anterior reclinate orbital seta/posterior reclinate orbital seta in length) = 0.33 (0.32-0.47), vb (subvibrissal seta/vibrissa in length) = 0.44 (0.24-0.47), dc1l (1st dorsocentral seta/3rd dorsocentral seta in length) = 0.91 (0.88-0.95), dc2l (2nd dorsocentral seta/3rd dorsocentral seta in length) = 0.78 (0.77-0.92), sctl (basal scutellar seta/apical scutellar seta in length) = (n/a)/(0.96-1.06), sterno (anterior katepisternal seta/posterior katepisternal seta in length) = 0.39 (0.39-0.56), orbito (distance between proclinate and posterior reclinate orbital setae/distance between inner vertical and posterior reclinate orbital setae) = 0.56 (0.40-0.61), dc1p (distance between ipsilateral 1st and 2nd dorsocentral setae/distance between 2nd dorsocentral setae) = 0.76 (0.70-0.79), dc2p (distance between ipsilateral 2nd and 3rd dorsocentral setae/distance between 2nd dorsocentral setae) = 0.79 (0.69-0.80), sctlp (distance between ipsilateral scutellar setae/distance between apical scutellar setae) = 0.94 (0.93-1.04), C (2nd costal section between subcostal break and R2+3/3rd costal section between R2+3 and R4+5) = 1.31 (1.17-1.51), 4c (3rd costal section between R2+3 and R4+5/M1 between r-m and dm-cu) = 2.29 (1.72-2.54), 4v (M1 between dm-cu and wing margin/M1 between r-m and dm-cu) = 3.21 (2.40-3.36), 5 × (CuA1 between dm-cu and wing margin/dm-cu between M1 and CuA1) = 3.82 (2.97-3.85), ac (3rd costal section between R2+3 and R4+5/distance between distal ends of R4+5 and M1) = 2.92 (2.84-3.33), M (CuA1 between dm-cu and wing margin/M1 between r-m and dm-cu) = 1.43 (1.10-1.48), C3F (length of heavy setation in 3rd costal section/length of 3rd costal section) = 0.53 (0.50-0.60).

Distribution.

China (Yunnan).

Relationships.

This species closely resembles De. repletoides (CS-code = abcdEfGHiJkLm, Okada 1982) in the structures of male terminalia Carson and Okada 1980: fig. 3).

Etymology.

Referring to the apically more or less acute (acuti -) aedeagus (penis).

Figures

Figure 4. Dettopsomyia acutipenis Wang & Gao, sp. nov. (A-I # 00151, J-L paratype # 00380) A left lateral habitus B head and thorax (dorsal view) C wing (right, dorsal view) D abdomen (lateral view) E abdomen (dorsal view) F periphallic organs (posterolateral view) G surstylus H phallic organs (ventral view) I aedeagus (dorsolateral view) J oviscapt (lateral view) K oviscapt (ventral view) L spermatheca. Abbreviations: aed = aedeagus, aed apod = aedeagal apodeme, cerc = cercus, epand = epandrium, hypd = hypandrium, sur = surstylus. Scale bars: 1.0 mm (photograph) or 0.1 mm (line drawing).