Longrich, N.R.; Field, D.J.
taxonomy · morphology · methods · range
Comparative skull and ontogeny analysis testing, and rejecting in that study, synonymy of Torosaurus with Triceratops; the debate remains hypothesis-bound.
Triceratops remains a separately diagnosed genus in Longrich and Field’s sampled ontogenetic comparison with Torosaurus; the result is one side of an active taxonomic hypothesis and does not determine the genus’s complete range.
claim:taxon:triceratopsTriceratops is displayed at 68–66 Ma only as the sampled latest-Maastrichtian material used in the Triceratops–Torosaurus test, not complete genus endpoints. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.
claim:taxon:triceratops:source-bounded-range-rc49The cited cranial and stratigraphic studies do not directly determine diet, habitat preference, locomotion, body size or ecological guild for Triceratops; those profile fields are explicitly withheld.
claim:taxon:triceratops:profile-ecology