21145 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Paralejurus Otarion sp: Fossilworks (Paleobiology Database)

Otarion sp: Fossilworks (Paleobiology Database)

Belgium (1)

in the coasts of Poland

• Triassic of the Russian Federation (1 collection)

nicely mineralized

21145 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Paralejurus Otarion sp: Fossilworks (Paleobiology Database)Xiphosurans are an order of arthropods related to arachnids, or, according to one recent study, actually arachnids. They are sometimes called horseshoe crabs (a name applied more specifically to the only extant family, Limulidae). They first appeared in the Tremadocian (Lower Ordovician) from Fezouata Fm in South Morocco. Currently, there are only four living species. They are members of the order Xiphosura, which contains two suborders, Xiphosurida