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Entity:

[Chelicerata] (Superclass) ..[†Aglaspidida] (Epiclass) ..[†Aglaspidida] (Class) ..[†Chasmataspida] (Class) ..[Euchelicerata] (Epiclass) ..[Merostomata] (Class) - horseshoe crabs ..[†Merostomoidea] (Class) ..[Pycnogonida] (Epiclass) - sea spiders ..[†Eurypteridea] (Class)

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Last updated: 1 Feb 2024