ArgentinepaleontologistsRodolfo Coria and Jorge Orlando Calvo named Anabisetia in 2002. The generic name honors the late Ana Maria Biset, an influential archeologist from Neuquén Province in Argentina, where the remains of this animal were found. The one named species is called A. saldiviai, after Roberto Saldivia Blanco, a local farmer who had discovered the fossils in 1985 and brought them to the attention of science in 1993.[1] The finds had already been reported in the scientific literature in 1996.[2][3]
Artist's impression of Anabisetia
There are four specimens known, all listed in the original 2002 description. The holotype, MCF-PVPH 74, is the most complete of the four. It consists of fragmentary skull material, including a partial braincase and both dentary (lower jaw) bones, as well as a complete forelimb from shoulder to hand, a complete hindlimb and foot, and representative vertebrae from all sections of the spinal column. The other three specimens are less complete, but include elements not seen in the holotype, including more vertebrae, a complete pelvis and a nearly complete, articulated tail. Two specimens are the paratypes, MCF-PVPH-75 and MCF-PVPH-76. The fourth, MCF-PVPH-77, is referred to the species. When all four specimens are considered, the skeleton is more or less completely known except for the skull. These specimens are housed at the Museo Carmen Funes in Plaza Huincul, Argentina.[1]
All four specimens were discovered at a locality called Cerro Bayo Mesa, thirty kilometers south of Plaza Huincul in the Neuquén province of Argentina. This locality is part of the Cerro Lisandro Formation, which is a geologic formation within the Rio Limay subgroup of the Neuquén Group. The sediments in this formation preserve a swamp which existed from the late Cenomanian through early Turonian stages of the Late Cretaceous Period, or about 95 to 92 million years ago.[4]
Description
Anabisetia was a small bipedal herbivore. In 2010 Gregory S. Paul estimated its length at two meters, its weight at twenty kilograms.[5] The describers established several unique traits of the species. At the back of the head, the connection with the neck, the occipital condyle, pointed rather downwards. The shoulder blade had an extension on its upper lower rim, the acromial process, that relatively was the largest ever found in the Euornithopoda. In the hand the fifth metatarsal was flattened with straight edges, instead of rounded in cross-section. In the pelvis, the ilium had a front blade that accounted for more than half of the total ilium length and extended in front of the prepubis. The ischium had a shaft that in the upper part was triangular in cross-section and in the lower part quadrangular. In the ankle the fibula touched the astragalus.[1]
Classification
This dinosaur is thought to be closely related to another Patagonian ornithopod, Gasparinisaura, although the lack of skull material makes it difficult to place with precision. When originally described, Gasparinisaura and Anabisetia were thought to be basaliguanodontians, more derived than Tenontosaurus and members of the cladeEuiguanodontia, and seen as endemic remnants of an early dispersion of basal iguanodontians on Pangea.[1] Relatively recent cladistic analyses performed by Coria and others indicated that Gasparinisaura lies just outside of Iguanodontia, closer to North American ornithopods like Thescelosaurus and Parksosaurus.[6]Anabisetia may fall in a similar position. However, in 2015, both taxa were found to be part of the clade Elasmaria along with other Antarctic and Patagonian ornithopods.[7]
^ abcdCoria, R.A. & Calvo, J.O. 2002. A new iguanodontian ornithopod from Neuquen Basin, Patagonia, Argentina. Journal of Vertebrate Paleontology. 22(3): 503–509
^R. A. Coria, G. Cladero, & L. Salgado, 1996, "Una neuva localidad fosilífera en la Formación Río Limay?, Cretácico Superior, Cerro Bayo Mesa, Provincia de Neuquén", Ameghiniana33(4): 463
^Coria, R.A. & J. O. Calvo, 1996, "Análisis filogenético preliminar del primer dinosaurio Iguanodontia registrado en la Formación Río Limay", Resúmenes XII Jornadas Argentinas de Paleontología de Vertebrados. Ameghiniana33: 462
^Leanza, H.A., Apesteguia, S., Novas, F.E., & de la Fuente, M.S. 2004. Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages. Cretaceous Research25(1): 61-87
^Paul, G.S., 2010, The Princeton Field Guide to Dinosaurs, Princeton University Press p. 277
^Norman, D.B., Sues, H-D., Witmer, L.M., & Coria, R.A. 2004. Basal Ornithopoda. In: Weishampel, D.A., Dodson, P., & Osmolska, H. (Eds.). The Dinosauria (2nd Edition). Berkeley: University of California Press. pp. 393–412
^Rozadilla, Sebastián, et al. "A new ornithopod (Dinosauria, Ornithischia) from the Upper Cretaceous of Antarctica and its palaeobiogeographical implications." Cretaceous Research 57 (2016): 311-324.
February 13, 2023
anabisetia, ɑː, genus, ornithopod, dinosaur, from, late, cretaceous, period, patagonia, south, america, small, bipedal, herbivore, around, metres, long, temporal, range, late, cretaceous, preꞒ, reconstructed, skeleton, castscientific, classificationkingdom, an. Anabisetia ˌ ɑː n e b iː ˈ s ɛ t i e AH ne bee SET ee e is a genus of ornithopod dinosaur from the Late Cretaceous Period of Patagonia South America It was a small bipedal herbivore around 2 metres 6 ft 7 in long AnabisetiaTemporal range Late Cretaceous 95 92 Ma PreꞒ Ꞓ O S D C P T J K Pg N Reconstructed skeleton castScientific classificationKingdom AnimaliaPhylum ChordataClade DinosauriaOrder OrnithischiaClade OrnithopodaClade ElasmariaGenus AnabisetiaCoria amp Calvo 2002Species A saldiviaiBinomial name Anabisetia saldiviaiCoria amp Calvo 2002 Contents 1 Discovery 2 Description 3 Classification 4 ReferencesDiscovery EditArgentine paleontologists Rodolfo Coria and Jorge Orlando Calvo named Anabisetia in 2002 The generic name honors the late Ana Maria Biset an influential archeologist from Neuquen Province in Argentina where the remains of this animal were found The one named species is called A saldiviai after Roberto Saldivia Blanco a local farmer who had discovered the fossils in 1985 and brought them to the attention of science in 1993 1 The finds had already been reported in the scientific literature in 1996 2 3 Artist s impression of Anabisetia There are four specimens known all listed in the original 2002 description The holotype MCF PVPH 74 is the most complete of the four It consists of fragmentary skull material including a partial braincase and both dentary lower jaw bones as well as a complete forelimb from shoulder to hand a complete hindlimb and foot and representative vertebrae from all sections of the spinal column The other three specimens are less complete but include elements not seen in the holotype including more vertebrae a complete pelvis and a nearly complete articulated tail Two specimens are the paratypes MCF PVPH 75 and MCF PVPH 76 The fourth MCF PVPH 77 is referred to the species When all four specimens are considered the skeleton is more or less completely known except for the skull These specimens are housed at the Museo Carmen Funes in Plaza Huincul Argentina 1 All four specimens were discovered at a locality called Cerro Bayo Mesa thirty kilometers south of Plaza Huincul in the Neuquen province of Argentina This locality is part of the Cerro Lisandro Formation which is a geologic formation within the Rio Limay subgroup of the Neuquen Group The sediments in this formation preserve a swamp which existed from the late Cenomanian through early Turonian stages of the Late Cretaceous Period or about 95 to 92 million years ago 4 Description EditAnabisetia was a small bipedal herbivore In 2010 Gregory S Paul estimated its length at two meters its weight at twenty kilograms 5 The describers established several unique traits of the species At the back of the head the connection with the neck the occipital condyle pointed rather downwards The shoulder blade had an extension on its upper lower rim the acromial process that relatively was the largest ever found in the Euornithopoda In the hand the fifth metatarsal was flattened with straight edges instead of rounded in cross section In the pelvis the ilium had a front blade that accounted for more than half of the total ilium length and extended in front of the prepubis The ischium had a shaft that in the upper part was triangular in cross section and in the lower part quadrangular In the ankle the fibula touched the astragalus 1 Classification EditThis dinosaur is thought to be closely related to another Patagonian ornithopod Gasparinisaura although the lack of skull material makes it difficult to place with precision When originally described Gasparinisaura and Anabisetia were thought to be basal iguanodontians more derived than Tenontosaurus and members of the clade Euiguanodontia and seen as endemic remnants of an early dispersion of basal iguanodontians on Pangea 1 Relatively recent cladistic analyses performed by Coria and others indicated that Gasparinisaura lies just outside of Iguanodontia closer to North American ornithopods like Thescelosaurus and Parksosaurus 6 Anabisetia may fall in a similar position However in 2015 both taxa were found to be part of the clade Elasmaria along with other Antarctic and Patagonian ornithopods 7 Cladogram based in the phylogenetic analysis of Rozadilla et al 2015 HypsilophodonThescelosaurusIguanodontia Elasmaria GasparinisauraMorrosaurusTrinisauraMacrogryphosaurusNotohypsilophodonTalenkauenAnabisetiaParksosaurusKangnasaurusRhabdodontidaeTenontosaurusDryomorphaReferences Edit a b c d Coria R A amp Calvo J O 2002 A new iguanodontian ornithopod from Neuquen Basin Patagonia Argentina Journal of Vertebrate Paleontology 22 3 503 509 R A Coria G Cladero amp L Salgado 1996 Una neuva localidad fosilifera en la Formacion Rio Limay Cretacico Superior Cerro Bayo Mesa Provincia de Neuquen Ameghiniana 33 4 463 Coria R A amp J O Calvo 1996 Analisis filogenetico preliminar del primer dinosaurio Iguanodontia registrado en la Formacion Rio Limay Resumenes XII Jornadas Argentinas de Paleontologia de Vertebrados Ameghiniana 33 462 Leanza H A Apesteguia S Novas F E amp de la Fuente M S 2004 Cretaceous terrestrial beds from the Neuquen Basin Argentina and their tetrapod assemblages Cretaceous Research 25 1 61 87 Paul G S 2010 The Princeton Field Guide to Dinosaurs Princeton University Press p 277 Norman D B Sues H D Witmer L M amp Coria R A 2004 Basal Ornithopoda In Weishampel D A Dodson P amp Osmolska H Eds The Dinosauria 2nd Edition Berkeley University of California Press pp 393 412 Rozadilla Sebastian et al A new ornithopod Dinosauria Ornithischia from the Upper Cretaceous of Antarctica and its palaeobiogeographical implications Cretaceous Research 57 2016 311 324 Retrieved from https en wikipedia org w index php title Anabisetia amp oldid 1048412671, wikipedia, wiki, book, books, library,
