Phylogeny of the Crocodylotarsi, with reference to archosaurian and crurotarsan monophyly

Abstract

To cite this article: J. Michael Parrish (1993): Phylogeny of the Crocodylotarsi, with reference to archosaurian and crurotarsan monophyly, Journal of Vertebrate Paleontology, 13:3, 287-308To link to this article: http://dx.

Basal Dinosauriform Remains from Britain and the Diagnosis of the Dinosauria

“…), which in turn appear to differ in some respects from the type species (Terrestrisuchus gracilis) from Pant-y-ffynon. The smallest archosaurian so far identi®ed in the new deposit is tentatively assigned to the Rauisuchiformes (sensu Parrish 1993). Several small rauisuchians have been reported from a wide range of ®ssure localities (e.g.…”

“…Pseudosuchians, on the other hand, typically have a crescentic deltopectoral crest that is positioned within the proximal 25 per cent of the length of the humerus. Parrish (1993) questioned the precise de®nition of these characters because certain features are gradational, particularly the degree of curvature of the medial margin of the proximal head. More recently, Sereno (1994) clari®ed his description of the deltopectoral crest character, stating that in Dinosauria the deltopectoral crest was at least 35 per cent of the length of the humerus.…”

Macroevolutionary patterns in the evolutionary radiation of archosaurs (Tetrapoda: Diapsida)

“…Several cladistic analyses have focused on Triassic and Early Jurassic archosaur phylogeny, which largely agree that the crown archosaur clade is divided into two major subgroups: Avemetatarsalia (essentially equivalent to a clade known as Ornithodira: including birds, dinosaurs, and their close relatives) and Crurotarsi (also known as Pseudosuchia: including crocodylomorphs and their extinct relatives, including phytosaurs, aetosaurs, ornithosuchids, and rauisuchians) (Gauthier 1986;Benton & Clark 1988;Sereno & Arcucci 1990;Sereno 1991;Juul 1994;Bennett 1996;Benton 1999Benton , 2004Irmis et al 2007;Nesbitt et al 2009Brusatte et al 2010a). Beyond this, however, many disagreements have persisted, including debates over which crurotarsan clade is most basal, which taxa are the closest relatives of crocodylomorphs, and whether or not rauisuchians form a monophyletic group (Parrish 1993;Benton & Walker 2002;Gower 2002;Nesbitt 2003Nesbitt , 2007Nesbitt & Norell 2006;Weinbaum & Hungerbü hler 2007;Brusatte et al 2010a).…”

Supplemental Material for 'Postcranial osteology of Azendohsaurus madagaskarensis (?Middle to Upper Triassic, Isalo Group, Madagascar) and its systematic position among stem archosaur reptiles. (Bulletin of the American Museum of Natural History, no. 398)'

“…The initial diversification of Archosauria during the Triassic has been the focus of voluminous research (e.g., Romer, 1956;Charig, 1980;Benton, 1983;Gauthier, 1986;Benton and Clark, 1988;Sereno, 1991;Parrish, 1993;Juul, 1994;Nesbitt, 2003Nesbitt et al, 2011;Brusatte et al, 2008;Butler et al, 2011) because this clade: (1) includes two important extant groups, crocodylians and birds; (2) is a classic example of an adaptive radiation; and (3) has recently been the focus of many groundbreaking macroevolutionary studies. Archosauria is just one component of a larger radiation of Archosauromorpha (stem archosaurs and the crown clade Archosauria) that arose either just prior to the end of the Permian or soon after the end-Permian extinction (Ezcurra et al, 2014).…”