Lamsdell, J.C.; Briggs, D.E.G.; Liu, H.P.; Witzke, B.J.; McKay, R.M.
taxonomy · topology · range
The named Winneshiek material and sampled matrix provide a local minimum record, not a global eurypterid origin.
Pentecopterus decorahensis material from the Darriwilian Winneshiek Lagerstätte supplies a named local eurypterid occurrence and an expanded morphology matrix. It is a specimen- and locality-bounded minimum record, not the exact global origin or full range of Eurypterida.
claim:taxon:eurypteridaVan Roy et al. document Fezouata eurypterid appendages and score morphology in a matrix, while Lamsdell et al. provide a sampled Pentecopterus comparison; these characters do not establish order-wide anatomy.
claim:taxon:eurypterida:morphology