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.
claim:taxon:pycnogonida:fossil-rangeNew insights into the Devonian sea spiders of the Hunsrück Slate
Sabroux, R.; Garwood, R.J.; Pisani, D.; Donoghue, P.C.J.; Edgecombe, G.D.
Year2024
Source roleprimary-study
DOI / ID10.7717/peerj.17766
Fitness and scope
taxonomy · range · morphology · topology
Table 1 classifies Cambropycnogon only as possibly Pycnogonida, requiring a contested total-group interpretation.