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Ambiortiformes
Ambiortiformes is a group of prehistoric birds.
The first species to be included, ''Ambiortus dementjevi'', lived sometime during the Barremian age between 136.4 and 125 million years ago〔Holtz, Thomas R. Jr. (2012). ''Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages,'' (Winter 2011 Appendix ) (PDF).〕 in today's Mongolia. ''A. dementjevi'' belongs to the Ornithuromorpha (the group containing modern birds but not enantiornithes), according to all published cladistic analyses. However, the exact position of the species within this group has been controversial. Most analyses have found it to be either an unresolved member of the Ornithurae, or a more primitive member of Ornithuromorpha. One 2006 study, for example, found it to be more primitive than ''Yanornis'' but more advanced than ''Hongshanornis'', or even a member of the specific group containing both ''Yanornis'' and ''Yixianornis''.〔You, Lamanna, Harris, Chiappe, O'Connor, Ji, Lu, Yuan, Li, Zhang, Lacovara, Dodson and Ji, (2006). "A nearly modern amphibious bird from the Early Cretaceous of Northwestern China". ''Science'', 312: 1640-1643.〕
The group includes at least ''Ambiortus'' and possibly the supposed close relative ''Apsaravis''. The results of a cladistic analysis published in 2011 indicate that ''Apsaravis'' and ''Palintropus'' are very closely related.〔Longrich, N.R., Tokaryk, T., and Field, D.J. (2011). "Mass extinction of birds at the Cretaceous/Paleogene (K/Pg) boundary". ''Proceedings of the National Academy of Sciences'', 108(37): 15253-15257. .〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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