Onnia vs Ampyx
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Onnia
Onnia is a genus of trinucleid trilobites from the Ordovician Period. It is known from parts of Europe and North Africa and belongs to a group characterized by a broad cephalic fringe. The fringe contains numerous regularly arranged perforations, giving the cephalon a distinctive sieve-like appearance. Onnia is relevant to studies of Ordovician trilobite diversity, cephalic construction, and the e...
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Ampyx
Ampyx is an extinct genus of trilobite from the order Trinucleida that lived during the Ordovician period. These blind trilobites are easily recognized by the long, prominent glabellar spine that extends forward from the front of their cephalon, as well as their distinct genal spines. Fossil specimens are commonly discovered in marine sedimentary deposits across Britain and other parts of Europe....
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