Bi, S.; Wang, Y.; Guan, J.; Sheng, X.; Meng, J.
taxonomy · topology · morphology · range · methods
Primary descriptions and morphology-matrix analyses of three Jurassic euharamiyidans; their placement and inferred deep split are topology and dating hypotheses.
Three Jurassic euharamiyidan skeletons add cranial and postcranial characters to a mammaliaform matrix and support a haramiyidan–multituberculate grouping in that analysis; competing matrices and older tooth-only taxa keep broader Haramiyida placement model-dependent.
claim:taxon:haramiyida:topologyBroad Mesozoic matrices distinguish crown-based Mammalia from more inclusive mammaliaform usage, and Jurassic euharamiyidan analyses can move key fossils across that boundary; the atlas Mammalia route therefore does not turn its 225 Ma display ceiling into a crown origin date.
claim:taxon:mammalia:concept-boundaryMammalia is displayed at 164.7–0 Ma only as a contested matrix-dependent navigation envelope; it is not a crown-Mammalia origin date. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.
claim:taxon:mammalia:source-bounded-range-rc49Haramiyida is displayed at 205.7–157.3 Ma only as the source's contested haramiyidan sample envelope, not a stable clade FAD/LAD. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.
claim:taxon:haramiyida:source-bounded-range-rc49