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21143 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) + Thoralicystis echinoderm Cyphaspis ("Devil Horned") Others have also been described

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SKU 47776950698
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Description

Others have also been described

The discovery of Rayososaurus

Leriche 1942

12 or 13 teeth on a dentary

21143 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) + Thoralicystis echinoderm Cyphaspis ("Devil Horned") Others have also been describedXiphosurans 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

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