Xiphosura


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Related to Xiphosura: Limulidae, Merostomata, Symphyla, Eurypterids

Xiphosura

the group containing the king crabs, aquatic ARACHNIDS that occur as fossils as far back as the Palaeozoic era.
References in periodicals archive ?
Originally, they were regarded as Xiphosura and Gastropods imprints.
Some debate exists, however, as to whether the relatively large and varied ommatidial units of Xiphosura and Myriapoda are an ancestral trait, from which the more stringently organized insect eyes evolved (Harzsch et al.
Opisthosomal fusion and phylogeny of Palaeozoic Xiphosura.