21142 - Premium Grade Soft Bodied 2 Xiphosurids (Horseshoe Crab Ancestor) Lower Ordovician Cut & Polished Ammonites Dyrosaurus minor

Dyrosaurus minor

It is typical of some levels of the Upper Fezouata Formation

Cephalopoda - Ammonitida - Cleoniceratidae

Samples (polished thin-sections) also were studied under scanning electron microscope (Research Technical Services – UA)

It has some glued and tiny restored (filled) fractures

21142 - Premium Grade Soft Bodied 2 Xiphosurids (Horseshoe Crab Ancestor) Lower Ordovician Cut & Polished Ammonites Dyrosaurus minorXiphosurans 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