Description and phylogenetic implications of extant and fossil oologic remains
- 出版日期：2004.
- 页数：1 v. :
- 第一责任说明：Darla K. Zelenitsky.
- 分类号：a540
- ISBN：0612978745(ebk.) :
MARC全文
02h0029520 20120620113726.0 cr un||||||||| 120620s2004 xx ||||f|||d||||||||eng | NQ97874 0612978745(ebk.) : CNY371.35 NGL NGL NGL a540 Zelenitsky, Darla K. Description and phylogenetic implications of extant and fossil oologic remains [electronic resource] / Darla K. Zelenitsky. 2004. 1 v. : digital, PDF file. Adviser: Currie, Philip J. Thesis (Ph.D.)--University of Calgary (Canada), 2004. Rigorous analytical techniques are combined with phylogenetic-systematic methodology to provide a new perspective on the scientific informativeness of the eggs and eggshells of both extant and extinct dinosaurs. Re-description of the eggs of paleognathous birds reveals that numerous eggshell characteristics were overlooked by previous investigators. A cladistic analysis of discrete egg characters of paleognaths reveals that although trees based on egg data provide less resolution among taxa than those based on skeletal data, egg data do provide phylogenetic information and can help resolve disagreements in relationships derived from skeletal data. In an analysis based on the egg data alone, tinamous are basal among paleognaths, Apteryx is basal among ratites and the sister taxon of an unresolved clade consisting of large ratites, within which Aepyornis and dinornithids form a subclade and Casuarius and Dromaius form a subclade. When the egg data are combined with the skeletal data of Bledsoe (1988), the clade of Apteryx, Casuarius, and Dromaius is dissolved, and Apteryx moves to a basal position within Ratitae. Analysis of 13 absolute measurements and ratios from the eggs reveals that only 4 of these continuous characters are suitable for cladistic analysis. A cladistic analysis of the continuous and discrete characters provides further resolution among taxa within the tree based on egg data in that Struthio and Rhea form a clade. Paleontology. Electronic dissertations. aeBook. aCN bNGL http://pqdt.bjzhongke.com.cn/Detail.aspx?pid=7idEoDpbwZY%3d NGL Bs1576 rCNY371.35 ; h1 bs1204