21142 - Premium Grade Soft Bodied 2 Xiphosurids (Horseshoe Crab Ancestor) Lower Ordovician Cut & Polished Ammonites Cephalopoda - Ammonitida - Cleoniceratidae
Yard notes & kiln story
Description
Cephalopoda - Ammonitida - Cleoniceratidae
This is a small rarity coming from the Paleogene phosphate quarries of the sedimentarian basin of Oulad Abdoun (Morocco)
Top rare mosasaur species
Samples (polished thin-sections) also were studied under scanning electron microscope (Research Technical Services – UA)
Precious juvenile full jaw of this crocodile species
21142 - Premium Grade Soft Bodied 2 Xiphosurids (Horseshoe Crab Ancestor) Lower Ordovician Cut & Polished Ammonites Cephalopoda - Ammonitida - CleoniceratidaeXiphosurans 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