New data on anatomy of the Late Cretaceous multituberculate mammal Catopsbaatar
The Gobi Desert is famous for providing one of the worlds best preserved Cretaceous terrestrial faunas, including dinosaurs and mammals. Beginning with the Central Asiatic Expeditions in the 1920s, through the Polish−Mongolian Expeditions in the 1960s-1970s, Soviet−Mongolian Expeditions in 1970s, and fi− nally the Mongolian Academy−American Museum Expeditions in the 1990s-2000s, the number of complete skulls (see Kielan− Jaworowska et al. 2000 for review) of Cretaceous mammals of− ten
... s of− ten associated with postcranial skeletons, found in Mongolia in− creased to several hundred. In addition to these professional ex− peditions, there have been other types of trips to Mongolia, also aimed at collecting fossils. The Nomadic Expeditions Company in USA organizes one of these, and has made trips to Mongolia since 1996. During the 1999 Nomadic Expedition, a skull asso− ciated with parts of the postcranial skeleton of the multituber− culate mammal Catopsbaatar catopsaloides was found. The specimen is more complete than others previously known of this species and brings new data on multituberculate anatomy and ontogenetic variation. In this note we discuss the new data on the structure of C. catopsaloides; the details of its anatomy will be described in subsequent papers by the two first authors.