21190 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Silicified Pine Cones 183 Inch = 4

183 Inch = 4

Precious tooth of Squalicorax pristodontus (Crow Shark) from a new phosphate location in the Atlas mountains (Morocco)

which has an invertivorous diet

In the same matrix you can see an associated shark tooth

21190 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Silicified Pine Cones 183 Inch = 4Xiphosurans 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