21172 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Dinosaurs 5 and 5% of the

5 and 5% of the sample

Revision and phylogenetic affinities of Elosuchus

The largest of them

• Chazy of Canada (4: Ontario

The Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina

21172 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Dinosaurs 5 and 5% of theXiphosurans 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