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Trinisaura
Trinisaura
is an extinct genus of ornithopod dinosaur known from the lower levels of the Late Cretaceous Snow Hill Island Formation (lower Campanian
Campanian
stage) of James Ross Island, Antarctica. It contains a single species, Trinisaura
Trinisaura
santamartaensis.[1] The species was in 2013 named by Rodolfo Aníbal Coria e.a. The generic name honours the geologist Trinidad Diaz. The specific name refers to the Santa Marta Cove site where the specimen was in 2008 found by Coria and Juan José Moly.[1] That same year, the find was reported in the scientific literature.[2] The holotype, MLP-III-1-1, consists of a partial skeleton lacking the skull, of a subadult individual about 1.5 metres (4.9 ft) in length.[1] Phylogeny[edit] The cladogram below follows Coria et al., 2013 phylogenetic analysis. Trinisaura
Trinisaura
is found to be an ornithopod, however the inclusion of Thescelosaurus neglectus
Thescelosaurus neglectus
is necessary to determine whether it is a basal iguanodont.[1]

Ornithopoda

Hypsilophodon
Hypsilophodon
foxii

Gasparinisaura
Gasparinisaura
cincosaltensis

Trinisaura
Trinisaura
santamartaensis

Talenkauen
Talenkauen
santacrucensis

Anabisetia
Anabisetia
saldiviai

Tenontosaurus

Dryomorpha

Dryosauridae

Ankylopollexia

In 2015, it along with several other Patagonian and Antarctic ornithopods was found to be a part of the basal group of iguanodonts, Elasmaria. Cladogram
Cladogram
based in the phylogenetic analysis of Rozadilla et al., 2015:

Hypsilophodon

Thescelosaurus

Iguanodontia

Elasmaria

Gasparinisaura

Morrosaurus

Trinisaura

Macrogryphosaurus

Notohypsilophodon

Talenkauen

Anabisetia

Parksosaurus

Kangnasaurus

Rhabdodontidae

Tenontosaurus

Dryomorpha

References[edit]

^ a b c d Coria, R. A.; Moly, J. J.; Reguero, M.; Santillana, S.; Marenssi, S. (2013). "A new ornithopod (Dinosauria; Ornithischia) from Antarctica". Cretaceous
Cretaceous
Research. doi:10.1016/j.cretres.2012.12.004.  ^ Coria, R.A., Moly, J.J., Reguero, M., Santillana, S., 2008, "Nuevos restos de Ornithopoda
Ornithopoda
(Dinosauria, Ornithischia) de la Fm. Santa Marta, Isla J. Ross, Antártida", Ameghiniana 45(4), Supl., 25R

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Taxon identifiers

Wd: Q2783396 Fossilworks: 255010

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