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Syngonosaurus

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Syngonosaurus is an extinct genus of ornithopoddinosaur from the Early Cretaceous. It was an iguanodontian discovered in the Cambridge Greensand of England[1] and was first described in 1879. The type species, S. macrocercus, was described by British paleontologistHarry Seeley in 1879[2] and it was later synonymised with Acanthopholis, but the genus was reinstated in a 2020 study, when Syngonosaurus and Eucercosaurus were reinterpreted as basal iguanodontians.[3]

Discovery and naming

Sacral vertebra of S. macrocercus as seen from two different angles[2]

In 1869 Harry Govier Seeley named several new species of Acanthopholis based on remains from the Cambridge Greensand, including A. macrocercus, based on specimens CAMSM B55570-55609.[4]

In 1879 Seeley named the genus Syngonosaurus based on part of the type material of Acanthopholis macrocercus.[2]

In 1999 Xabier Pereda-Superbiola and Paul M. Barrett reviewed all Acanthopholis material. They concluded that all species were nomina dubia whose syntype specimens were composites of non-diagnostic ankylosaur and ornithopod remains; including Syngonosaurus.[5]

Syngonosaurus was synonymised with Acanthopholis in 1999, but the genus was reinstated in a 2020 study, when Syngonosaurus and Eucercosaurus were reinterpreted as basal iguanodontians.[3]

Classification

Syngonosaurus was seen as an ankylosaur in both a 2001 publication[1] and a 2004 publication.[6] In 2020, Syngonosaurus was classified into Iguanodontia.[3]

References

  1. 1 2 Carpenter, Kenneth (2001). «Análisis filogenético de los anquilosaurios». En Carpenter, Kenneth (ed.). Los dinosaurios acorazados . Indiana University Press. pp. 455–480 . ISBN  0-253-33964-2.
  2. 1 2 3 Seeley, HG (1879). "Sobre los dinosaurios de la arenisca verde de Cambridge" . Quarterly Journal of the Geological Society . 35 ( 1–4 ): 591–636 . Bibcode : 1879QJGS...35..591S . doi : 10.1144/GSL.JGS.1879.035.01-04.42 . ISSN 0370-291X . S2CID 129277596 .  
  3. 1 2 3 Barrett, Paul M.; Bonsor, Joseph A. (2020). "Una revisión de los dinosaurios no aviares Eucercosaurus tanyspondylus y Syngonosaurus macrocercus del Cambridge Greensand, Reino Unido" . Cretaceous Research . 118 104638. doi : 10.1016/j.cretres.2020.104638 . S2CID 225289654 . 
  4. ↑ Seeley, HG (1871). "XXXVII.— Sobre Acanthopholis platypus (Seeley), un paquípodo del Cambridge Upper Greensand" . Annals and Magazine of Natural History . 8 (47): 305– 318. doi : 10.1080/00222937108696494 . ISSN 0374-5481 . 
  5. ↑ Superbiola, XP; Barrett, PM (1999). "Una revisión sistemática de los restos de dinosaurios anquilosaurios del Albiense-Cenomaniense de Inglaterra". Special Papers in Palaeontology . 60 : 177–208 .
  6. ↑ MK Vickaryous, T. Maryanska y DB Weishampel. 2004. Ankylosauria. En DB Weishampel, P. Dodson y H. Osmolska (eds.), The Dinosauria ( segunda edición ). University of California Press, Berkeley, 363-392.