Children (12 direct children, 118131 direct and indirect children):
Horseshoe crab
(tree size 18)
Limulidae
Xiphosurida
(tree size 118085)
Belinuridae
(tree size 3)
Mesolumilidae
(tree size 1)
Palaeolimulidae
(tree size 2)
Weinberginidae
(tree size 2)
Elleriidae
(tree size 2)
Kiaeriidae
(tree size 2)
Pseudoniscidae
(tree size 2)
Pseudoniscid
Archeolimulidae
(tree size 1)
Synziphosurida
(tree size 1)
Willwerathia