Corresponding author: Guang-Chun Liu (
Academic editor: Martin Hauser
A new genus,
Liu G-C (2020) A new genus of the
In the course of an ongoing study of Chinese scuttle flies (
Specimens were stored in 80% ethanol. The head, legs, and one wing were detached and slide mounted according to the method of
Supra-antennal setae absent; flagellomere 1 not elongate; costa of female thickened; wing vein Rs with several fine setulae along upper side; vein Rs deflected slightly at the junction with vein M1; vein R2+3 absent; tip of vein R4+5 not enlarged; hind tibia with an antero-apical seta but without an antero-basal seta; male hypandrium without dense microsetae; aedeagus with a long, curled sclerotized process.
The genus name is derived from
China (Liaoning, Hebei, Shaanxi, Sichuan).
In
9 | Posterior ocelli close to eye margin and ocellar triangle strongly demarcated at front by a sinuous furrow |
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– | Posterior ocelli well removed from eye margin and ocellar triangle not demarcated in this way at front |
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9a | Tip of wing vein Rs thickened |
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– | Tip of wing vein Rs not thickened |
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9b | Hind tibia with antero-apical seta, but without antero-basal seta |
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– | Hind tibia with both antero-apical and antero-basal setae |
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9c | Anepisternum with a strong seta and short setulae |
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– | Anepisternum only with short setulae |
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9d | Wing vein R1+2 present and strongly developed |
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– | Wing vein R1+2 absent; aedeagus with a long, curled, sclerotized process |
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9e | Wing vein Rs deflected at mid length; anterior ocellus not elevated; hypandrium with dense microsetae |
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– | Wing vein Rs more or less straight; anterior ocellus elevated; hypandrium without dense microsetae |
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114 | Anepisternum bare; hind tibia without longitudinal setal palisades |
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– | Anepisternum with setulae; hind tibia with two dorsal longitudinal setal palisades |
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114a | Wing vein R2+3 very weak; tip of vein R1 thickened | |
– | Wing vein R2+3 strongly developed; tip of vein R1 not thickened |
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119 | Posterior ocelli clearly closer to eyes than to anterior ocellus, and ocellar region usually clearly demarcated in front by a sinuous furrow |
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– | Posterior ocelli clearly closer to anterior ocellus than to eyes, and ocellar region not clearly demarcated in this way in front |
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119a | Tip of vein R1 thickened | |
– | Tip of vein R1 not thickened |
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119b | Anterior ocellus elevated, broader than high; costa not thickened |
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– | Anterior ocellus not elevated, subcircular; costa thickened |
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119c | Hind tibia with antero-basal seta; vein Rs deflected at mid length |
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– | Hind tibia without antero-basal seta; vein Rs deflected at the junction with vein M1 |
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1 | Female |
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– | Male |
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2 | Abdominal tergites light brown with some dark area; tergite III wide-mouth-urn shaped (Fig. |
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– | Abdominal tergites uniformly dark brown; tergite III trapezoid (Fig. |
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3 | Tergite VI triangular (Fig. |
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– | Tergite VI trapezoid (Fig. |
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4 | Tergites with light rear band; hypandrium with a short pointed fronto-ventral process (Figs |
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– | Tergites without light rear band; hypandrium with a long hockey-stick-shaped fronto-ventral process (Figs |
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Female abdominal tergites yellow with some brownish patches, venter whitish yellow; tergite III wide-mouth-urn shaped, tergite VI long and triangular. Male abdominal tergites brown, tergites II–IV divided by yellow median band; hypandrium with only a short fronto-ventral process.
Male terminalia of
The species name refers to the polymorphic abdominal tergites of the female.
China (Liaoning, Hebei, Shaanxi).
The new species is easily distinguished from other species of the genus by the polymorphic abdominal tergites of the female. The fronto-ventral process of hypandrium is short and pointed. The biology of the species is unknown, but the female is saprophagous and the male is phototactic.
Female abdominal tergites uniformly dark brown; tergites II–III rectangular, tergites IV–VI trapezoid. Male tergites mostly dark brown, tergite VI with triangular yellow area at rear edge; hypandrium with a long hockey-stick-shaped fronto-ventral process.
Male terminalia of
The name refers to the dark color of the species.
China (Shaanxi).
The new species is distinguished from
China • 1 ♀ (holotype); Sichuan, Baoxing, Mt. Huashu;
Female abdominal tergites and venter uniformly black; tergite V rectangular, 2 × as long as its width; tergite VI triangular.
China (Sichuan).
The species differs from other known species of the genus by the rectangular shape of tergite V and the triangular tergite VI. It was formerly assigned to the genus
I would like to thank Drs. Brian Brown, Henry Disney and Emily Hartop for their valuable comments on this manuscript. The present research was supported by the Fund of National Nature Science Foundation of China (31372245).