A revised morphology matrix provides an explicit phylogenetic hypothesis across sampled Heterostraci. The topology does not convert stratigraphic sampling into an exact group origin, extinction date or ancestor sequence.
claim:taxon:heterostraciA phylogeny for Heterostraci (stem-gnathostomes)
Randle, E.; Keating, J.N.; Sansom, R.S.
Year2025
Source roleprimary-study
DOI / ID10.1002/spp2.70030
Fitness and scope
topology · taxonomy · range
A whole-group morphology matrix; topology does not directly establish the group's global range.
Claim ledger
The Heterostraci study matrix includes dated Silurian–Early Devonian occurrences, supporting a 443.8–393.3 Ma study-sample window; this is not a global FAD, LAD or ancestor sequence.
claim:taxon:heterostraci:range-boundary