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Clade
Subclade Archosauria: Avemetatarsalia to Neornithes 

Taxon Feedback
Taxon Abelisauridae 
Nominal Author Bonaparte and Novas 1985 
2° Nominal Author  
Taxon Status active
inactive
Comments

Abelisauridae was first defined by Novas (1997) and Sereno (1998) as a node-based taxon. Wilson et al. (2003) presented a second-order revision of Abelisauridae as a stem-based taxon in opposition to the stem-based taxon Noasauridae, which came to be recognized as its sister taxon. The advantage of a stem-based definition of Abeliauridae is that it forms a stable node-stem triplet, identifying a major dichotomy in the history of the Abelisauroidea. As a node-based taxon, in contrast, Abelisauridae would have excluded the recently described basal member Rugops (Sereno et al. 2004). Taxonomists appear to have followed this arrangement, regarding Rugops as an abelisaurid.

The active definition, thus, is a first-order revision of that stem-based definition, which uses species. The revised definition also cites for exclusion two additional species (Coelophysis bauri, Passer domesticus) that ensure stabiliy of the taxonomic content of Abelisauridae, should abelisaurids be placed elsewhere among basal theropods.

Padian (1999) and Tykoski and Rowe (2004) have followed the initial definitions of Novas (1997) and Sereno (1998). Tykoski and Rowe (2004), nonetheless, were unaware of the earlier second-order revision by Wilson et al. (2003).

 
Potential Synonomy Abelisauria 

Inactive Taxon Status Feedback
Rejection Criteria junior synonym
historically polyphyletic
incomplete definition
no definition
apomorphy-based
redundant
other 
Critique  
 

Current Age Range Feedback
Earliest Record Aptian/Albian (112 Ma) 
Latest Record Maastrichtian (66 Ma) 
Range (My) 46 
Basis for Range The earliest record comes from the mid Cretaceous (Aptian/Albian) of Africa, as yet unnamed abelisaurid and noasaurid from Niger (Sereno et al. 2004). The latest record comes from the Maastrichtian of Madagascar and India (Sampson et al. 1998; Wilson et al. 2003). Dates are rounded to the nearest million, the earliest from the midpoint of the two stages indicated and the latest from the end of the stage (Gradstein et al. 2004). 

Definitional History #1
Definition 1 Previously listed taxa [Abelisaurus comahuensis, Carnotaurus sastrei, Xenotarsosaurus bonapartei, Indosaurus matleyi, Indosuchus raptorius, Majungasaurus crenatissimus] and all descendants of their common ancestor. 
Author Novas 1997:1 
Type node  stem 
Specifiers Abelisaurus comahuensis, Carnotaurus sastrei, Xenotarsosaurus bonapartei, Indosaurus matleyi, Indosuchus raptorius, Majungasaurus crenatissimus 
Qualifiers  

Definitional History #2
Definition 2 Abelisaurus, Carnotaurus, their most recent common ancestor and all descendants. 
Author Sereno 1998:64 
Type node  stem 
Specifiers Abelisaurus, Carnotaurus 
Qualifiers  

Definitional History #3
Definition 3 Carnotaurus, Abelisaurus, and all descendants of their most recent common ancestor. 
Author Padian et al. 1999:70 
Type node  stem 
Specifiers Carnotaurus, Abelisaurus 
Qualifiers  

Definitional History #4
Definition 4 The most inclusive clade containing Carnotaurus sastrei but not Noasaurus leali
Author Wilson et al. 2003:30 
Type node  stem 
Specifiers Carnotaurus sastrei, Noasaurus leali 
Qualifiers  

Definitional History #5
Definition 5 Abelisaurus comahuensis and Carnotaurus sastrei and all descendants of their most recent common ancestor. 
Author Tykoski and Rowe 2004:64 
Type node  stem 
Specifiers Abelisaurus comahuensis, Carnotaurus sastrei 
Qualifiers