منابع مشابه
Reproductive Traits of Non-avian Theropods
The reproductive biology of non-avian theropods, primarily maniraptorans, is revisited using recent fossil discoveries in the framework of the extant phylogenetic bracket. It is apparent that non-avian theropods shared some reproductive characters with crocodilians, some with birds, but also possessed their own unique features. Whereas the non-avian theropod reproductive system retained primiti...
متن کاملUnenlagiinae revisited: dromaeosaurid theropods from South America.
Over the past two decades, the record of South American unenlagiine dromaeosaurids was substantially increased both in quantity as well as in quality of specimens. Here is presented a summary review of the South American record for these theropods.Unenlagia comahuensis, Unenlagia paynemili, and Neuquenraptor argentinus come from the Portezuelo Formation, the former genus being the most complete...
متن کاملUnenlagiid theropods: are they members of the Dromaeosauridae (Theropoda, Maniraptora)?
In the present paper we analyze the phylogenetic position of the derived Gondwanan theropod clade Unenlagiidae. Although this group has been frequently considered as deeply nested within Deinonychosauria and Dromaeosauridae, most of the features supporting this interpretation are conflictive, at least. Modification of integrative databases, such as that recently published by Hu et al. (2009), p...
متن کاملFeeding Mechanics in Spinosaurid Theropods and Extant Crocodilians
A number of extant and extinct archosaurs evolved an elongate, narrow rostrum. This longirostrine condition has been associated with a diet comprising a higher proportion of fish and smaller prey items compared to taxa with broader, more robust snouts. The evolution of longirostrine morphology and a bulbous anterior rosette of premaxillary teeth also occurs in the spinosaurid theropod dinosaurs...
متن کاملOn Top Spaces
In this paper the notion of smooth complete semidynamical systems is studied. A relation between the rank of the derivatives of a motion at a point and at the identity of that point is deduced. A method for constructing top generalized subgroups is considered. Connected component of an identity as a top generalized normal subgroup is studied. A criterion for the connectedness of an inverse imag...
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ژورنال
عنوان ژورنال: Nature Ecology & Evolution
سال: 2018
ISSN: 2397-334X
DOI: 10.1038/s41559-018-0571-x