1. Species Limulus polyphemus (Linnaeus, 1758)
2. Species Limulus albus Bosc, 1802 accepted as Limulus polyphemus (Linnaeus, 1758) (listed as synonym by Dunlop et al., 2012)
3. Species Limulus americanus Leach, 1819 accepted as Limulus polyphemus (Linnaeus, 1758) (listed as synonym by Dunlop et al., 2012)
4. Species Limulus cyclops Fabricius, 1793 accepted as Limulus polyphemus (Linnaeus, 1758) (listed as synonym by Dunlop et al., 2012)
5. Species Limulus gigas O.F. Müller, 1785 accepted as Tachypleus gigas (O. F. Müller, 1785) (listed as synonym by Dunlop et al., 2012)
6. Species Limulus heterodactylus Latreille, 1802 accepted as Tachypleus gigas (O. F. Müller, 1785) (listed as synonym by Dunlop et al., 2012)
7. Species Limulus latreilli Leach, 1819 accepted as Tachypleus gigas (O. F. Müller, 1785) (listed as synonym by Dunlop et al., 2012)
8. Species Limulus longispina van der Hoeven, 1838 accepted as Tachypleus tridentatus (Leach, 1819) (listed as synonym by Dunlop et al., 2012)
9. Species Limulus macleaii Leach, 1819 accepted as Tachypleus gigas (O. F. Müller, 1785) (listed as synonym by Dunlop et al., 2012)
10. Species Limulus moluccanus Latreille, 1802 accepted as Tachypleus gigas (O. F. Müller, 1785) (listed as synonym by Dunlop et al., 2012)
11. Species Limulus occidentalis Lamarck, 1801 accepted as Limulus polyphemus (Linnaeus, 1758) (listed as synonym by Dunlop et al., 2012)
12. Species Limulus rotundicauda Latreille, 1802 accepted as Carcinoscorpius rotundicauda (Latreille, 1802) (Basionym)
13. Species Limulus sowerbii Leach, 1815 accepted as Limulus polyphemus (Linnaeus, 1758) (listed as synonym by Dunlop et al., 2012)
14. Species Limulus tridentatus Leach, 1819 accepted as Tachypleus tridentatus (Leach, 1819) (transferred by Pocock, 1902)
15. Species Limulus viriscens Latreille, 1806 accepted as Tachypleus gigas (O. F. Müller, 1785) (listed as synonym by Dunlop et al., 2012)

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