Naraoiids are a simple diversified group inside the Arthopoda. Although they have lot of affinity's with trilobites they are a independent, "cognate" group. This results are based on the fact that Naraoiids do not have a calcium- carbonate hardened body parts. It is also improbable that they are a progenetic group*. (*R. Fortey in Kaesler et al 1997) According to that point this group was also entitled as "lather- trilobites". However it is very easy to imagine how rarely animals without any hard structures are able to preserve. Please spent special attention to the also preserved vessel system.

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