Lamsdell, J.C.
taxonomy · topology · morphology · range
Primary expanded morphological phylogenetic analysis; traditional synziphosurines are tested as a polyphyletic assemblage rather than assumed to be horseshoe crabs.
An expanded fossil-and-living morphology matrix resolves traditional synziphosurines across several euchelicerate stems rather than as one simple horseshoe-crab lineage; the result revises a classification hypothesis and does not demonstrate morphological stasis or a single habitat history.
claim:event:xiphosura-total-group-topologyLamsdell's 2020 revision compares fossil and living horseshoe crabs and discusses an Ordovician record separated from the next Upper Devonian occurrences by a fossil-record gap. This study-linked navigation span is not continuous occupancy, an exact origin date or a complete global range.
claim:taxon:xiphosura