"Xiphosurine" isn't an actual genus, this is just an undescribed arthropod within the subclass Xiphosura (horseshoe crabs), order Xiphosurida.
This can be regarded as a early horseshoe crab, or a least a forerunner of the horseshoe crabs.
This is an exceptional specimen, with beautifully preserved shell and excellent preparation, but also preserved legs.
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