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A PRESUMED TITANOSAURIAN VERTEBRA FROM THE LATE CRETACEOUS OF NORTH ISLAND, NEW ZEALAND
A bone recovered from the Upper Cretaceous Maungataniwha Sandstone of North Island, New Zealand, appears to be an incomplete titanosaurian caudal centrum. The proportions of the apparently procoelous centrum suggest that it is a middle caudal. This indicates the presence of a titanosaurian sauropod in Campanian-Maastrichtian New Zealand. At this time, titanosaurians are known from South America, Africa, India, Laurasian Asia, Europe, and North America. Palaeozoogeographic considerations suggest that titanosaurians were also present in Antarctica.
The fossil titanosaurian caudal centrum (CD.586) from Mangahouanga Stream (A-D) compared with an unidentified titanosaurian caudal (MACN unnumbered) from Argentina (E-F). (A) Ventral view, showing two cavities (light regions) in the centrum; (B) dorsal view; (C) posterior view; (D) right lateral view; (E) posterior view; (F) left lateral view, reversed for comparison. The conical forms of the condyles can be seen in outline in A, B, D, and F. The depression at the apex of the condyle of CD.586 retains some matrix and hence is light in color, but that of the MACN caudal is dark from shadow. The photos are of a cast of the specimen. Abbreviations: (c.r.) circumferential rim; (dep.) apical depression; (n.c.) base of neural canal. Scale bars = 50mm.