1. Species Mytilarca cailunguoshaoensis S.-F. Liang, 1976 †
2. Species Mytilarca chemungensis (Conrad, 1842) †
3. Species Mytilarca liaojiaoensis F.-X. Guo, 1985 †
4. Species Mytilarca oviformis (Conrad, 1842) †
5. Species Mytilarca parens (Barrande, 1881) †
6. Species Mytilarca porkuniensis Isakar, 1991 †
7. Species Mytilarca yunnanensis F.-X. Guo, 1985 †
8. Subgenus Mytilarca (Plethomytilus) J. Hall, 1883 † accepted as Mytilarca J. Hall, 1869 † (unaccepted > junior subjective synonym)
   1. Species Mytilarca (Plethomytilus) knappi J. Hall, 1884 † (uncertain > unassessed)
9. Species Mytilarca attenuata J. Hall & Whitfield, 1869 † accepted as Mytilarca chemungensis (Conrad, 1842) † (unaccepted > junior subjective synonym)
10. Species Mytilarca carinata J. Hall, 1883 † accepted as Mytilarca chemungensis (Conrad, 1842) † (unaccepted > junior subjective synonym)
11. Species Mytilarca modioloides Whidborne, 1896 † accepted as Gosseletina modioloides (Whidborne, 1896) † (unaccepted > superseded combination)
12. Species Mytilarca beyrichi Holzapfel, 1882 † (uncertain > unassessed)
13. Species Mytilarca dubia Walcott, 1884 † (uncertain > unassessed)
14. Species Mytilarca gibbosa J. Hall, 1884 † (uncertain > taxon inquirendum)
15. Species Mytilarca lata (J. Hall, 1883) † (uncertain > taxon inquirendum)
16. Species Mytilarca muongthensis Mansuy, 1913 † (uncertain > unassessed)
17. Species Mytilarca ponderosa J. Hall, 1869 † (uncertain > unassessed)
18. Species Mytilarca pyramidata J. Hall, 1883 † (uncertain > unassessed)
19. Species Mytilarca regularis J. Hall, 1884 † (uncertain > taxon inquirendum)
20. Species Mytilarca simplex (J. Hall, 1883) † (uncertain > taxon inquirendum)
21. Species Mytilarca umbonata J. Hall, 1883 † (uncertain > taxon inquirendum)

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