Relationship To Other Taxa
Once soft-part anatomy had been recovered, the trilobites were originally allied to the Crustacea; however, this suggestion has since fallen out of favour. A relationship with the Chelicerata, in a clade termed Arachnomorpha (Arachnata), was in vogue for some time; a position in the Mandibulata (=Myriapoda + Crustacea + Hexapoda) stem-group may be a more parsimonious alternative.
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