Key words: Dinosauria, Theropoda, Oviraptorosauria, Late Cretaceous, Gobi Desert, Mongolia.

Rinchen Barsbold [barsgeodin@magicnet.mn] and Khishigjaw Tsogtbaatar, Institute of Geology, Mongolian Academy of Sciences, Enkh Taivani Gudamji, Ulan Bator 210351, Mongolia. Halszka Osmólska [osm@twarda.pan.pl], Instytut Paleobiologii PAN, ul. Twarda 51/55, PL-00-818 Warszawa, Poland. Mahito Watabe [wmahito@pa2.so-net.ne.jp], Hayashibara Museum of Natural Sciences, Shimoishii 1-2-3, Okayama 700-0907, Japan. Philip. J. Currie [PCurrie@mcd.gov.ab.ca], Royal Tyrrell Museum of Palaeontology, Box 7500, Drumheller, Alberta TOJ OYO, Canada.