WXiphosura
WAtlantic horseshoe crab
WAustrolimulus
WBellinuridae
WBellinurus
WCoxal gland
WEuproops
WHorseshoe crab
WLimulus
WLunataspis
WMangrove horseshoe crab
WMesolimulus
WSynziphosurina
WTachypleini
WTachypleus
WTachypleus gigas
WTachypleus tridentatus
WWillwerathia