21142 - Premium Grade Soft Bodied 2 Xiphosurids (Horseshoe Crab Ancestor) Lower Ordovician Cut & Polished Ammonites Only the matrix has fracture

Only the matrix has fracture that has been glued and filled

Notorynchus

It is typical of some levels of the Upper Fezouata Formation

It has some glued and tiny restored (filled) fractures

21142 - Premium Grade Soft Bodied 2 Xiphosurids (Horseshoe Crab Ancestor) Lower Ordovician Cut & Polished Ammonites Only the matrix has fractureXiphosurans 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