Merostomata Woodward, 1866
Aglaspidichnus Radwanksi & Roniewicz, 1967
Anderella Moore, McKenzie & Lieberman, 2007
Belinuropsis Matthew, 1909
Bifarius Tasch, 1961
Dickinsonia Tasch, 1963
Dipeltis Packard, 1885
Drabovaspis Chlupác, 1963
Elmocephalus Tasch, 1964
Habcyne Meyer, 1844
Halycine Zittel, 1885
Hemiaspis Woodward, 1865
Hypatocephala Tasch, 1961
Kasibelinurus Pickett, 1993
Kioeria Størmer, 1933
Lagrandella Eldredge, 1974
Limulidae
Limulites Krueger, 1823
Liomesaspididae
Permolimulinella Tasch, 1963
Pincombella Chapman, 1932
Protolimulus Packard, 1886
Rutroclypeus Withers, 1933
Steropis Bailey, 1858
Strongylocephalus Tasch, 1961
