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New ceratopsian paper
Tereschenko, V.S., 2004. On the heterocelous vertebrae in horned dinosaurs
(Protoceratopidae, Neoceratopsia). Paleontological Journal 38 (2): 200-205.
Abstract?Four or five anterior caudal vertebrae of archaic horned dinosaurs
(Protoceratopidae) have the heterocelous centrum. The cranial and caudal
articular surfaces of these centra are posteriorly concave in the ventral
view and anteriorly concave in the lateral view. The heterocelous shape of
such centra allows neighboring vertebrae to move relative to one another in
both the vertical and horizontal planes and prevents torsion. The torsional
force in the proximal caudal vertebrae is exerted by the caudofemoral
muscles.
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