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” estimated as Maastrichtian in age and two Palaeocene species recently attributed to Euclastes wielandi
Sister taxa: Acherontisuchus
Cheirurina
Specimens of an extremely rare species
conical with blunt apices
21171 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician KemKem_Beds_Fish_Assemblage ” estimated as Maastrichtian inXiphosurans 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