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Prionocheilus obtusus
without restorations
Simple copper carbonate (CuCO3) is not known to exist in nature
Ginglymostoma globidens
21150 - Great Soft Bodied 2 Xiphosurids (Horseshoe Crab Ancestor) Lower Ordovician Phacodus Prionocheilus obtususXiphosurans 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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