Caenagnathoidea

The earliest definitive caenagnathoid is Microvenator celer, which dates to the late Aptian age of the early Cretaceous period, though the slightly earlier Caudipteryx from the lower Yixian Formation of China, may also be a member of this group.

Classification

The internal classification of the oviraptorosaurs has also been controversial. Most early studies divided them into two primary sub-groups, the Caenagnathidae and the Oviraptoridae. The Oviraptoridae was further divided into the small, short-armed, and crestless subfamily Ingeniinae, and the larger, crested, long-armed Oviraptorinae. However, later phylogenetic studies showed that many traditional members of the Caenagnathidae were in fact more closely related to the crested oviraptorids. Because Caenagnathus itself is no longer considered part of this group, the subfamily is usually now termed the Elmisaurinae. The taxonomy here follows the one presented by Thomas Holtz, Jr. in 2010 unless otherwise noted.

The following cladogram follows an analysis by Phil Senter, 2007.