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The taxon has long been considered a nomen dubium, owing to its fragmentary nature and some doubt as to its precise geographic and stratigraphic origins (see Tykoski et Rowe, 2004, p. 50).[1] However, a recent redescription of the type material by Rauhut (2004) has shed some light on these questions and seems to establish the taxonomic validity of Genyodectes serus, the only species referred to the genus.[2] English paleontologist Sir Arthur S. Woodward described Genyodectes in 1901,[3] and, after Loncosaurus (Ameghino, 1899; nomen dubium),[4] it is the second non-avian dinosaur described from the South American continent, and it remained the most completely known South American theropod until the 1970s. Over the last decade, the holotype has been variously referred to as a megalosaurid, a

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  • Genyodectes
  • Genyodectes
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  • The taxon has long been considered a nomen dubium, owing to its fragmentary nature and some doubt as to its precise geographic and stratigraphic origins (see Tykoski et Rowe, 2004, p. 50).[1] However, a recent redescription of the type material by Rauhut (2004) has shed some light on these questions and seems to establish the taxonomic validity of Genyodectes serus, the only species referred to the genus.[2] English paleontologist Sir Arthur S. Woodward described Genyodectes in 1901,[3] and, after Loncosaurus (Ameghino, 1899; nomen dubium),[4] it is the second non-avian dinosaur described from the South American continent, and it remained the most completely known South American theropod until the 1970s. Over the last decade, the holotype has been variously referred to as a megalosaurid, a
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abstract
  • The taxon has long been considered a nomen dubium, owing to its fragmentary nature and some doubt as to its precise geographic and stratigraphic origins (see Tykoski et Rowe, 2004, p. 50).[1] However, a recent redescription of the type material by Rauhut (2004) has shed some light on these questions and seems to establish the taxonomic validity of Genyodectes serus, the only species referred to the genus.[2] English paleontologist Sir Arthur S. Woodward described Genyodectes in 1901,[3] and, after Loncosaurus (Ameghino, 1899; nomen dubium),[4] it is the second non-avian dinosaur described from the South American continent, and it remained the most completely known South American theropod until the 1970s. Over the last decade, the holotype has been variously referred to as a megalosaurid, a tyrannosaurid, Theropoda incertae sedis, and a possible abelisaurid (perhaps even a senior synonym of Abelisaurus). However, the recent removal of the holotype from the "artificial matrix" in which it had long been displayed has permitted a reevaluation of the specimen. Rauhut (2004, p. 900) concluded that the specimen lacks important abelisaurid and tyrannosaurid synapomorphies, but found many neoceratosaurian traits.[2] This would seem to imply Genyodectes was closer to Ceratosaurus than the more derived abelisaurs (that also descended from animals like Ceratosaurus). Also, by studying historical records and preservation of the bones, Rauhut (2004, p. 894) concluded that the specimen was likely collected from the Cerro Castaño Member of the Cerro Barcino Formation (Aptian-Albian).
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