The 500–0 Ma pycnogonid display is a contested total-group fossil-to-living navigation envelope because Cambropycnogon is only possibly a pycnogonid and is not a secure crown first appearance.
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References / paperA Larval Sea Spider from the Upper Cambrian Orsten of Sweden, and the Phylogenetic Position of Pycnogonids
Waloszek, D.; Dunlop, J.A.
Year2002
Source roleprimary-study
DOI / ID10.1111/1475-4983.00244
Fitness and scope
taxonomy · range · morphology · topology
Primary study proposes Cambropycnogon as the oldest pycnogonid/chelicerate record; subsequent review leaves its assignment uncertain.