Genus Mongoloraphidia H. Aspöck & U. Aspöck, 1968

Mongoloraphidia H. Aspöck & U. Aspöck, 1968: 59 . Type species: Agulla sororcula H. Aspöck & U. Aspöck, 1966: 226 (original designation).

Diagnosis. Mongoloraphidia can be diagnosed by the absence of the complex of gonocoxites, gonapophyses, and gonostyli 10 and the reduction of the anterior part of the ectoproct in the male genitalia.

Distribution. China, India, Japan, Kazakhstan, Khabarovsk, Kyrgyzstan, Mongolia, Pakistan, Russia, Tajikistan, Turkmenistan, Uzbekistan.

Key to species of Mongoloraphidia from China based on male characters (revised after Liu et al. 2010b)

( M. (F.) formosana (Okamoto, 1917) is not included because the male is unknown).

1. Species from mainland of China ......................................................................... 4

- Species from Taiwan .................................................................................. 2

2. Gonapophyses 9 posteriorly with a pair of ventrally curved processes (Liu et al. 2010a: fig. 5)............ .. M. (F.) curvata

- Gonapophyses 9 posteriorly ending straight................................................................ 3

3. Gonapophyses 9 with lateral processes in ventral view (H. Aspöck et al. 1991: fig. 1107)............... M. (F.) taiwanica

- Gonapophyses 9 without lateral processes in ventral view (H. Aspöck et al. 1991: fig. 1109)............... M. (F.) caelebs

4. Gonostylus 9 bifurcate (Liu et al. 2010b: fig. 5).................................................... M. abnormis

- Gonostylus 9 not bifurcate.............................................................................. 5

5. Gonapophyses 9 posteriorly distinctly domed in lateral view; ectoproct with prominent posteroventral corners (Liu et al. 2010b: fig. 13)................................................................................ M. liupanshanica

- Gonapophyses 9 posteriorly flat in lateral view; ectoproct not prominent posteroventrally............................ 6

6. Gonocoxite 9 posteriorly with a long digitiform process....................................................... 7

- Gonocoxite 9 posteriorly without a long digitiform process (Figs 2, 5)......................... M. xinjiangana sp. nov.

7. Gonostylus 9 nearly half as long as arm (apodeme) of gonocoxite 9 (H. Aspöck et al. 1998: fig. 12).................... 8

- Gonostylus 9 slightly longer than or as long as arm (apodeme) of gonocoxite 9 (Liu et al. 2010b: fig. 21)............... 9

8. Gonapophyses 9 distally strongly fused and narrowed in ventral view (Fig. 12)............................ M. kaskabi

- Gonapophyses 9 distally feebly fused in ventral view (Liu et al. 2010b: fig. 22).............................. M. yangi

9. Gonapophyses 9 in ventral view with a truncate posterior margin (H. Aspöck et al. 1998: fig. 7)................. M. xiyue

- Gonapophyses 9 in ventral view with a tapering posterior margin.............................................. 10

10. Gonapophyses 9 in ventral view distally strongly broadened (H. Aspöck et al. 1998: fig. 13)......................... 11

- Gonapophyses 9 in ventral view distally feebly broadened (Liu et al. 2018: fig. 3).............................. M. lini

11. Abdomen dorsally with a yellowish median vitta (Liu et al. 2018: fig. 7); gonapophyses 9 strongly enlarged distally into a subtriangular plate (Liu et al. 2018: fig. 10)...................................................... M. trangulata

- Abdomen dorsally with a series of yellowish spots on posteromedian portion; gonapophyses 9 slightly widened distally into a relatively small, heart-shaped plate (H. Aspöck et al. 1998: fig. 13)..................................... M. duomilia