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Re: New alvarezsaurid (resend)



And the complete reference is here:

Xu X., Wang D.-Y., Sullivan C., Hone D.W., Han F.-L., Yan R.-H. & Du F.-M. 2010. A basal parvicursorine (Theropoda: Alvarezsauridae) from the Upper
Cretaceous of China. Zootaxa 2413: 1-19.

Abstract
A new alvarezsaurid theropod, Xixianykus zhangi gen. et sp. nov., is described based on a partial postcranial skeleton collected from the Upper Cretaceous Majiacun Formation of Xixia County, Henan Province. The new taxon can be diagnosed by the following autapomorphies: sacral rib-transverse process complexes and zygapophyses fused to form separate anterior and posterior laminae; distinct fossa dorsal to antitrochanter on lateral surface of ilium; short ridge along posterior surface of pubic shaft near proximal end; distinct depression on lateral surface of ischium near proximal end; sharp groove along posterior surface of ischium; distal end of femur with transversely narrow ectocondylar tuber that extends considerable distance proximally as sharp ridge; transversely narrow tibial cnemial crest with sharp, ridgelike distal half; lateral margin of tibiotarsus forms step near distal end; fibula with substantial extension of proximal articular surface onto posterior face of posteriorly curving shaft; distal tarsals and metatarsals co-ossified to form tarsometatarsus; and sharp flange along anteromedial margin of metatarsal IV near proximal end. Cladistic analysis places this taxon as a basal parvicursorine within the Alvarezsauridae, a position consistent with the presence of several incipiently developed parvicursorine features in this taxon and also with its relatively early geological age. A brief analysis of vertebral functional morphology, together with data from the hindlimb, suggests that parvicursorines represent extreme cursors among non-avian dinosaurs.

Link to the complete paper: http://www.mapress.com/zootaxa/2010/2/zt02413p019.pdf

GUY LEAHY a écrit :
E-mail resent, *this* time with plain text... :-)
http://www.mapress.com/zootaxa/2010/f/z02413p019f.pdf http://www.sciencedaily.com/releases/2010/03/100329084854.htm Guy Leahy