Topic
Effigia
About: Effigia is a research topic. Over the lifetime, 4 publications have been published within this topic receiving 316 citations.
Papers
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1 Jan 2007TL;DR: Effigia conclusively indicates that the skull of Shuvosaurus and the postcrania of “Chatterjeea” belong to the same taxon, and the close relationship between Shuvosaurs and Effigia indicates that both taxa are nested within the suchian clade and not within Ornithomimisauria.
Abstract: Effigia okeeffeae is named based on a well-preserved nearly complete skeleton from the Upper Triassic (?Rhaetian) “siltstone member” at Ghost Ranch, northern New Mexico. The skull is described and compared to other suchian and basal archosaurs. The maxilla and premaxilla are edentulous, and a rhamphotheca was possibly present in life. Effigia conclusively indicates that the skull of Shuvosaurus and the postcrania of “Chatterjeea” belong to the same taxon. Furthermore, the close relationship between Shuvosaurus and Effigia indicates that both taxa are nested within the suchian clade and not within Ornithomimisauria. However, the similarity in features in the skull and postcrania of Effigia and ornithomimids suggests extreme convergence occurred between the two clades. A clade containing Arizonasaurus, Bromsgroveia, Poposaurus, Sillosuchus, Shuvosaurus, and Effigia is suggested based solely on shared derived character states. Additionally, a clade (Clade Y) containing Sillosuchus, Shuvosaurus, and ...
200 citations
TL;DR: A new Late Triassic suchian archosaur with unusual, highly specialized features that are convergent with ornithomimid dinosaurs is reported, suggesting that these archosaurs show iterative patterns of morphological evolution.
Abstract: Living archosaurs comprise birds (dinosaurs) and crocodylians (suchians). The morphological diversity of birds and stem group dinosaurs is tremendous and well-documented. Suchia, the archosaurian group including crocodylians, is generally considered more conservative. Here, we report a new Late Triassic suchian archosaur with unusual, highly specialized features that are convergent with ornithomimid dinosaurs. Several derived features of the skull and postcranial skeleton are identical to conditions in ornithomimids. Such cases of extreme convergence in multiple regions of the skeleton in two distantly related vertebrate taxa are rare. This suggests that these archosaurs show iterative patterns of morphological evolution. It also suggests that this group of suchians occupied the adaptive zone that was occupied by ornithomimosaurs later in the Mesozoic.
142 citations
1 Jan 2007
TL;DR: Effigia okeeffeae Nesbitt and Norell, 2006, is the name for the associated skull and postcranium of Shuvosaurus and Chatterjeea as mentioned in this paper.
Abstract: The distinctive, edentulous archosaur Shuvosaurus inexpectatus Chatterjee, 1993, was named based on a skull, whereas the postcrania of the same taxon were named Chatterjeea elegans Long and Murry, 1995. Effigia okeeffeae Nesbitt and Norell, 2006, is the name for the associated skull and postcranium of Shuvosaurus and Chatterjeea. Therefore, only one generic name, Shuvosaurus (= Chatterjeea, = Effigia), is valid, and the supposed diagnostic features of Effigia indicate that, at most, its type material represents a species of Shuvosaurus (S. okeeffeae) distinct from the type species of Shuvosaurus (S. inexpectatus). S. inexpectatus has a well documented, early Revueltian distribution in Texas-New Mexico, whereas S. okeeffeae is well documented from only one Apachean locality in New Mexico.
6 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2007 | 3 |
| 2006 | 1 |