Tsogtopteryx

Tsogtopteryx () is an extinct genus of azhdarchid pterosaurs known from the Late Cretaceous Bayanshiree Formation of Mongolia. The genus contains a single species, Tsogtopteryx mongoliensis, known from most of a cervical (neck) vertebra. It was closely related to Hatzegopteryx, and coexisted with Gobiazhdarcho, another azhdarchid more closely related to Quetzalcoatlus.

== Discovery and naming == thumb|left|Mongolian Cretaceous fossil localities; Tsogtopteryx is known from the Bayshin Tsav locality in Area C (Bayanshiree Formation) In 1993, a joint paleontological expedition between the Hayashibara Museum of Natural Sciences and the Mongolian Paleontological Center conducted fieldwork in the Gobi Desert of Mongolia. At the 'Bayshin Tsav' locality of the Bayanshiree Formation in Dornogovi Province, workers collected an isolated cervical (neck) vertebral element. This specimen, accessioned as MPC−Nd 100/303, comprises almost all of the sixth cervical vertebra, missing the posteriormost (furthest back) region. In 2009, Mahito Watabe and colleagues described this specimen, in addition to another isolated pterosaur cervical vertebra from the 'Burkhant' locality of the same formation. The authors refrained from naming either specimen, but discussed their anatomy and likely phylogenetic affinities in depth.