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.
Marine microalgae as dietary supplements in the culture of juvenile Chinese horseshoe crabs, Tachypleus tridentatus (Xiphosura).
This suggests an expansion of opsins in Xiphosura occurred after their split from the rest of Euchelicerata.
Xiphosura.--Horseshoe crabs are unique among living chelicerates in that there are far more fossil species than the four living ones.
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., 2005), or whether they are derived from an ancestor with more precisely regulated ommatidial cell identity (Paulus, 2000), as is known to be the insect-crustacean ancestral state.
Experimentally derived estimates of growth by juvenile Tachypleus tridentatus and Carcinoscorpius rotundicauda (Xiphosura) from nursery beaches in Hong Kong.