Syngonosaurus is an extinct genus of ornithopod dinosaur 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 paleontologist Harry 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]
| Syngonosaurus Temporal range: late Albian
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_By_Richard_Lydekker_(1888)_(20571332452).jpg)
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| Vertebra of S. macrocercus as seen from two different angles | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Neornithischia |
| Clade: | †Ornithopoda |
| Clade: | †Iguanodontia |
| Genus: | †Syngonosaurus Seeley, 1879 |
| Species: | †S. macrocercus
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| Binomial name | |
| †Syngonosaurus macrocercus Seeley, 1879
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| Synonyms | |
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Discovery and naming
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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
editSyngonosaurus 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
edit- ^ a b Carpenter, Kenneth (2001). "Phylogenetic Analysis of Ankylosauria". In Carpenter, Kenneth (ed.). The Armored Dinosaurs. Indiana University Press. pp. 455–480. ISBN 0-253-33964-2.
- ^ a b c Seeley, H.G. (1879). "On the Dinosauria of the Cambridge Greensand". Quarterly Journal of the Geological Society. 35 (1–4): 591–636. doi:10.1144/GSL.JGS.1879.035.01-04.42. ISSN 0370-291X. S2CID 129277596.
- ^ a b c Barrett, Paul M.; Bonsor, Joseph A. (2020). "A revision of the non-avian dinosaurs Eucercosaurus tanyspondylus and Syngonosaurus macrocercus from the Cambridge Greensand, UK". Cretaceous Research. 118: 104638. doi:10.1016/j.cretres.2020.104638. S2CID 225289654.
- ^ Seeley, H.G. (1871). "XXXVII.— On Acanthopholis platypus (Seeley), a Pachypod from the Cambridge Upper Greensand". Annals and Magazine of Natural History. 8 (47): 305–318. doi:10.1080/00222937108696494. ISSN 0374-5481.
- ^ Superbiola, X.P.; Barrett, P.M. (1999). "A systematic review of ankylosaurian dinosaur remains from the Albian-Cenomanian of England". Special Papers in Palaeontology. 60: 177–208.
- ^ M. K. Vickaryous, T. Maryanska, and D. B. Weishampel. 2004. Ankylosauria. In D. B. Weishampel, P. Dodson, and H. Osmolska (eds.), The Dinosauria (second edition). University of California Press, Berkeley 363-392