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falcoid ribs that spring in pairs from umbilical tubercles
Find: 2016
The scales of many of this teleost fish have a wonderful preservation due to its extreme robustness
Beautiful decorative plate made of polished rock with devonian fossils
21171 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician KemKem_Beds_Fish_Assemblage falcoid ribs that spring 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
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