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Clade
Subclade

Taxon
Taxon
Averostra
Nominal Author
Paul 2002
2nd Nominal Author
Taxon Status INACTIVE
Comments
Potential Synonomy

Active Phylogenetic Definition
Active Definition
Shorthand
Definitional Author
Definition Status Unknown
Definition Type Unknown
Node-Stem Triplet Unknown
Other Triplet Taxa
Specifiers
Specifier(s) A
Specifier(s) B
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown

Inactive Taxon Status
Rejection Criteria
Critique

Paul (2002:25) coined Averostra as a taxon containing Dromaeosauridae and theropods that possessed “at least one accessort maxillary opening in the lateral wall of the antorbital fossa that led into a bony mediorstral maxillary sinus.” Like most form-qualified (”apomorphy-based”) stem-based definitions, problems emerge involving homology. In Allosaurus fragilis, two openings and associated spaces are present at the anterior end of the antorbital fossa (Witmer 1997), the openings termed the promaxillary and maxillary fenerstrae. Some basal theropods, however, only have one of these openings, such as the abelisaurid Rugops or the allosauroid Carcharodontosaurus, and it is not always clear which one.

The clade identified as Averostra by Paul (2002:24), furthermore, is not resolved on cladograms by Carrano et al. (2002) and Sereno et al. (2004) that, in contrast, link Ceratosauria (sensu stricto) with Tetanurae. However, given that this arrangement is still controversial (Tykoski and Rowe 2004:fig. 3.12), proposing another taxon (however defined) seems premature.

 

Definitional History #1
Earliest Record
All avepods that either possessed at least one accessory maxillar opening in the lateral wall of the antorbital fossa that led into a body mediorostral maxillary sinus, or descended from such avepods, and are membes of the clade that includes the Dromaeosauridae.
Latest Record
Paul 2002:15
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Dromaeosauridae
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One accessory maxillary opening in the lateral wall of the antorbital fossa that led into a body med

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