Genyodectes ("jaw bite", from the Greek words genys ("jaw") and dektes ("bite")) is a genus of ceratosauriantheropod dinosaur from the Lower Cretaceous (Aptian) of South America. The holotype material (MLP 26–39, Museo de La Plata, La Plata, Argentina) was collected from the Cerro Barcino Formation, Cañadón Grande, Departamento Paso de Indios in the Chubut Province of Argentina and consists of an incomplete snout, including the premaxillae, portions of both maxillas, the right and left dentary, many teeth, a fragment of the left splenial, and parts of the supradentaries. These elements are generally poorly preserved and some are in articulation. The premaxilla of Genyodectes possesses relatively large and protruding teeth, similar to those of Ceratosaurus. The specific name, serus, means "late". In 2016 it was estimated to be 6.25 meters in length and 790 kg in weight.[1]
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).[2] 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.[3] English paleontologist Sir Arthur S. Woodward described Genyodectes in 1901,[4] and, after Loncosaurus (Ameghino, 1899; nomen dubium),[5] 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.[3] 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).[3]
Restoration of Genyodectes hunting an early mammal
Known material of Genyodectes
Size of Genyodectes compared to a human
Diagnosisedit
Illustration of the type specimen from the original description
Rauhut diagnoses Genyodectes serus as follows:[6] "Differs from all theropods with the possible exception of Ceratosaurus in that the premaxillary teeth are arranged in an overlapping en-echelon pattern and the longest maxillary tooth crowns are longer apicobasally than the minimal dorsoventral depth of the mandible. Differs from Ceratosaurus in the presence of four, as opposed to three, premaxillary teeth."[3]
Referencesedit
^Molina-Pérez & Larramendi (2016). Récords y curiosidades de los dinosaurios Terópodos y otros dinosauromorfos. Barcelona, Spain: Larousse. p. 255.
^Tykoski, R.S., and Rowe, T. (2004). Ceratosauria. In: Weishampel, D.B., Dodson, P., and Osmólska, H. (Eds.). The Dinosauria (2nd edition). University of California Press:Berkeley. ISBN0-520-24209-2.
^ abcdRauhut, O.W.M. (2004). Provenance and anatomy of Genyodectes serus, a large-toothed ceratosaur (Dinosauria: Theropoda) from Patagonia. Journal of Vertebrate Paleontology24(4):894-902.
^Woodward A. S. 1901. On some extinct reptiles from Patagonia, of the genera Meiolania, Dinilysia, and Genyodectes. Proceedings of the Zoological Society of London 1901:169-184.
^Ameghino, F. (1899). Nota preliminar sobre el Loncosaurus argentinus, un representante de la familia de los Megalosauridae en la Republica Argentina. Anales de la Sociedad Cientifica Argentina47:61-62.
^Rauhut, O.W.M. (2004) Provenance and anatomy of Genyodectes serus, a large-toothed ceratosaur (Dinosauria: Theropoda) from Patagonia. Journal of Vertebrate Paleontology 24(4):895-895
December 18, 2023
genyodectes, bite, from, greek, words, genys, dektes, bite, genus, ceratosaurian, theropod, dinosaur, from, lower, cretaceous, aptian, south, america, holotype, material, museo, plata, plata, argentina, collected, from, cerro, barcino, formation, cañadón, gran. Genyodectes jaw bite from the Greek words genys jaw and dektes bite is a genus of ceratosaurian theropod dinosaur from the Lower Cretaceous Aptian of South America The holotype material MLP 26 39 Museo de La Plata La Plata Argentina was collected from the Cerro Barcino Formation Canadon Grande Departamento Paso de Indios in the Chubut Province of Argentina and consists of an incomplete snout including the premaxillae portions of both maxillas the right and left dentary many teeth a fragment of the left splenial and parts of the supradentaries These elements are generally poorly preserved and some are in articulation The premaxilla of Genyodectes possesses relatively large and protruding teeth similar to those of Ceratosaurus The specific name serus means late In 2016 it was estimated to be 6 25 meters in length and 790 kg in weight 1 GenyodectesTemporal range Early Cretaceous 112 Ma PreꞒ Ꞓ O S D C P T J K Pg N Genyodectes holotypeScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClade DinosauriaClade SaurischiaClade TheropodaFamily CeratosauridaeGenus GenyodectesWoodward 1901Species G serusBinomial name Genyodectes serusWoodward 1901Taxonomy and phylogeny editThe 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 2 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 3 English paleontologist Sir Arthur S Woodward described Genyodectes in 1901 4 and after Loncosaurus Ameghino 1899 nomen dubium 5 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 3 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 Castano Member of the Cerro Barcino Formation Aptian Albian 3 nbsp Restoration of Genyodectes hunting an early mammal nbsp Known material of Genyodectes nbsp Size of Genyodectes compared to a humanDiagnosis edit nbsp Illustration of the type specimen from the original descriptionRauhut diagnoses Genyodectes serus as follows 6 Differs from all theropods with the possible exception of Ceratosaurus in that the premaxillary teeth are arranged in an overlapping en echelon pattern and the longest maxillary tooth crowns are longer apicobasally than the minimal dorsoventral depth of the mandible Differs from Ceratosaurus in the presence of four as opposed to three premaxillary teeth 3 References edit Molina Perez amp Larramendi 2016 Records y curiosidades de los dinosaurios Teropodos y otros dinosauromorfos Barcelona Spain Larousse p 255 Tykoski R S and Rowe T 2004 Ceratosauria In Weishampel D B Dodson P and Osmolska H Eds The Dinosauria 2nd edition University of California Press Berkeley ISBN 0 520 24209 2 a b c d Rauhut O W M 2004 Provenance and anatomy of Genyodectes serus a large toothed ceratosaur Dinosauria Theropoda from Patagonia Journal of Vertebrate Paleontology 24 4 894 902 Woodward A S 1901 On some extinct reptiles from Patagonia of the genera Meiolania Dinilysia and Genyodectes Proceedings of the Zoological Society of London 1901 169 184 Ameghino F 1899 Nota preliminar sobre el Loncosaurus argentinus un representante de la familia de los Megalosauridae en la Republica Argentina Anales de la Sociedad Cientifica Argentina 47 61 62 Rauhut O W M 2004 Provenance and anatomy of Genyodectes serus a large toothed ceratosaur Dinosauria Theropoda from Patagonia Journal of Vertebrate Paleontology 24 4 895 895 Retrieved from https en wikipedia org w index php title Genyodectes amp oldid 1099753906, wikipedia, wiki, book, books, library,
