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Euchelicerata ..[Arachnida] (Clade) ..†Dibasterium (Genus) ..†Houia (Genus) ..†Mollisonia (Genus) ..†Offacolus (Genus) ..†Polystomurum (Genus) ..Prosomapoda ..†Thurandina (Genus) ..[Xiphosura] - horseshoe crabs

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Last updated: 21 Sep 2025