Suplement: http://www.sciencemag.org/cgi/content/f ... 65/571/DC1Jonah N. Choiniere, Xing Xu, James M. Clark, Catherine A. Forster, Yu Guo, Fenglu Han (2010) "A Basal Alvarezsauroid Theropod from the Early Late Jurassic of Xinjiang, China" Science 327 965, 571 - 574 DOI: 10.1126/science.1182143
The fossil record of Jurassic theropod dinosaurs closely related to birds remains poor. A new theropod from the earliest Late Jurassic of western China represents the earliest diverging member of the enigmatic theropod group Alvarezsauroidea and confirms that this group is a basal member of Maniraptora, the clade containing birds and their closest theropod relatives. It extends the fossil record of Alvarezsauroidea by 63 million years and provides evidence for maniraptorans earlier in the fossil record than Archaeopteryx. The new taxon confirms extreme morphological convergence between birds and derived alvarezsauroids and illuminates incipient stages of the highly modified alvarezsaurid forelimb.
EDIT
Zaktualizowany artykuĹ o Alvarezsauroidea http://www.dinozaury.com/forum/viewtopi ... 3906#33906
EDIT2: Opis Haplocheirus http://www.dinozaury.com/forum/viewtopic.php?t=3361
Obrazki http://www.nsf.gov/news/news_images.jsp ... 91&org=NSF
Teraz krytyka. Nie rozumiem dwĂłch spraw:
1) skoro drzewko w ktĂłrym "alwarezzauroidy" (wĹaĹciwie klad Haplocheirus + Alvarezsauridae) sÄ taksonem siostrzanym Ornithomimosauria jest tylko o jeden (!) krok dĹuĹźsze niĹź najbardziej parsymoniczne (w ktĂłrym sÄ maniraptorami) to dlaczego nie dodali do definicji ornitomima?
2) Po co redefiniowaÄ Maniraptora?