21170 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Dinosaur Trilobita - Asaphida - Cyclopygidae
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Ships within 48 hours · Estimated delivery Sep 19 - Sep 24
Description
Trilobita - Asaphida - Cyclopygidae
freshwater limpets
and alkali sulfides (e
Chondrichthyes - Lamniformes - Odontaspididae
Beautiful example of a polished 9
21170 - Premium Grade Soft Bodied Xiphosurid (Horseshoe Crab Ancestor) Lower Ordovician Dinosaur Trilobita - Asaphida - CyclopygidaeXiphosurans 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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