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Two hypotheses on the phylogenetic position of Pycnogonida within Arthropoda. Left phylogram: Traditional placement of pycnogonids as sister group to Euchelicerata, both taxa forming the Chelicerata. Right phylogram: Alternative placement of pycnogonids as sister group to all remaining arthropod lineages, the latter representing the Cormogonida. Note the unresolved position of Myriapoda.
