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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