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Optimal clusterings found by the k-means analysis of the morphospace constrained by the Calinski criterium. A. LOP cluster (lobopodians, opabiniids and Cassubia). B. ANO, “Anomalocaris-type” cluster. C. HUR, “Hurdia-type” cluster (and tentatively, Sanctacaris). D. MPS, intermediate morphologies of Kiisortoqia, Kunmingella and Occacaris. E. MEC, megacheirans and chelicerates. F. ANT, antennulate morphologies.
