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Re: Theropod "migrations"
In a message dated 4/24/99 4:15:47 PM EST, Danvarner@aol.com writes:
<< If there was a robust Cretaceous land bridge, where are the Ceratopsidae
Eastern Asia? They go back to the Turonian in North America. That old
raises its frilled head once again, unless there is something I've
missed--which is quite possible. Dan Varner. >>
There is one known ceratopid in central Asia, Turanoceratops, described by
Nessov & Kazynshkina in 1989, with new material described by Nessov in 1995.
It looked something like Montanoceratops from the US. But other than that,
ceratopids don't seem to have gained a foothold in Asia the way they did in
North America. Most of the ceratopids evolved post-Bering-land-bridge in
North America, whereas there is a diverse assemblage of protoceratopids in
Asia. Luck of the draw? From Tracy's files:
Genus: Turanoceratops NESSOV & KAZNYSHKINA, 1989
Etymology: Turan, a Persian name of Turkistan and Greek, ceratops, "horn
face": "Turan horn face".
Species: tardabilis NESSOV & KAZNYSHKINA, 1989
Holotype: TsNIGR number #251/12457
Material: Left maxilla with teeth, and anterior, dorsal and posterior
portions broken away.
254/23457: Horn core.
255/12457: Horn core.
Teeth, predentary, the medial portion of the parietal, squamosals, nasal and
supraorbital horn cores, braincase, vertebrae and probable distal portion of