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RE: new paper on three African abelisauroids



Jose Ignacio Ruiz-Omeñaca wrote:


Proceedings: Biological Sciences
ISSN: 0962-8452 (Paper) 1471-2954 (Online)
Issue: FirstCite


Describes two new ceratosaurian genera:

_Spinostropheus gautieri_ (gen. et comb. nov.) based on material (disarticulated vertebrae, partial left humerus and partial right tibia; MNHN collection) originally described as _Elaphrosaurus gautieri_ (Lapparent 1960), plus referred vertebrae (MNN TIG6). This is a basal ceratosaurian of Neocomian age, more derived than _Elaphrosaurus_ and _Ceratosaurus_. _Spinostropheus_ is given as the sister taxon to the Abelisauroidea (=Abelisauridae+Noasauridae).

_Rugops primus_ (gen. et sp. nov.), of Cenomanian age, is based on a partial cranium lacking the posterolateral portions of the skull roof and palate (MNN IGU1). This is a basal abelisaurid; the skull is textured but hornless, and the skull roof is not thickened. _Rugops_ may be closely related to an unnamed Patagonian abelisaur known only from a maxilla (Lamanna et al. 2002).

The cladogram includes an expanded Noasauridae comprising _Deltadromeus_, _Noasaurus_, _Masiakasaurus_, and an unnamed Gadoufaoua taxon. _Laevisuchus_ and _Genusaurus_ are Abelisauroidea incertae sedis (no mention of _Velocisaurus_). _Rugops_ and possibly _Ilokelesia_ are given as basal abelisaurids.



Tim

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