1. Species Japonia (Japonia) citharella (A. Gould, 1859) accepted as Japonia citharella (A. Gould, 1859) (superseded combination)
2. Species Japonia (Japonia) glabrata (Möllendorff, 1886) accepted as Lagocheilus glabratus Möllendorff, 1886 (unaccepted combination)
3. Species Japonia (Japonia) hungerfordiana (Möllendorff, 1881) accepted as Lagocheilus hungerfordianus (Möllendorff, 1881) (unaccepted combination)
4. Species Japonia (Japonia) longipila (Möllendorff, 1884) accepted as Lagocheilus longipilus Möllendorff, 1884 (unaccepted combination)
5. Species Japonia (Japonia) michaui (Crosse & P. Fischer, 1863) accepted as Lagocheilus michaui (Crosse & P. Fischer, 1863) (unaccepted combination)
6. Species Japonia (Japonia) pellicosta (Möllendorff, 1882) accepted as Lagocheilus pellicosta (Möllendorff, 1882) (unaccepted combination)
7. Species Japonia (Japonia) pilosa (Möllendorff, 1884) accepted as Lagocheilus pilosus Möllendorff, 1884 (unaccepted combination)
8. Species Japonia (Japonia) sexfilaris (Heude, 1882) accepted as Lagocheilus sexfilaris (Heude, 1882) (unaccepted combination)
9. Species Japonia (Japonia) subconica (L. Pfeiffer, 1859) accepted as Japonia subconica (L. Pfeiffer, 1859)
10. Species Japonia (Japonia) trichophora (Möllendorff, 1881) accepted as Lagocheilus trichophorus (Möllendorff, 1881) (unaccepted combination)
11. Species Japonia (Japonia) clathrata (Heude, 1885) represented as Japonia clathrata (Heude, 1885)
12. Species Japonia (Japonia) concolor (Möllendorff, 1893) represented as Japonia concolor (Möllendorff, 1893)
13. Species Japonia (Japonia) crossei (Morlet, 1886) represented as Japonia crossei (Morlet, 1886)
14. Species Japonia (Japonia) gouldi Kobelt, 1902 represented as Japonia gouldi Kobelt, 1902 (basionym)
15. Species Japonia (Japonia) gradata (Möllendorff, 1894) represented as Japonia gradata (Möllendorff, 1894)
16. Species Japonia (Japonia) hagenmulleri (Mabille, 1887) represented as Japonia hagenmulleri (Mabille, 1887)
17. Species Japonia (Japonia) mariei (Morlet, 1886) represented as Japonia mariei (Morlet, 1886)
18. Species Japonia (Japonia) mendicans (Mabille, 1887) represented as Japonia mendicans (Mabille, 1887)
19. Species Japonia (Japonia) mucronata (Möllendorff, 1888) represented as Japonia mucronata (Möllendorff, 1888)
20. Species Japonia (Japonia) musiva (A. Gould, 1859) represented as Japonia musiva (A. A. Gould, 1859)
21. Species Japonia (Japonia) subcarinata (Möllendorff, 1887) represented as Japonia subcarinata (Möllendorff, 1887)
22. Species Japonia (Japonia) tenuipilis (Gredler, 1887) represented as Japonia tenuipilis (Gredler, 1887)

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