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cisiopurple — Huinculsaurus
Published: 2020-02-07 22:23:41 +0000 UTC; Views: 9077; Favourites: 104; Downloads: 0
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Huinculsaurus is probably just a juvenile Gualicho.
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Due to the few remains it’s a possibility
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If Gualicho is an elaphrosaur, that is. IIRC the most recent analysis shows Gualicho as a basal coelurosaur, so we can't say for certain.
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Not only are they from the same formation, but the character used to distinguish Huinculsaurus from Gualicho/Aoniraptor (pneumatic fossae in the vertebrae) is individually variable and not diagnostic.
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"The possibility that the holotype is only the young of Ilokelesia from the same location is problematic . The descriptors pointed to four differences between these taxa. The facets of the anterior projections are long and narrow at the posterior vertebrae while they are square at Ilokelesia . The facets of the front joint protrusions protrude upwards and inwards at the rear vertebrae and place upwards and outwards. The anterior ledge that runs from the vertebral body to the parapophysis is directed forward and downward rather than more or less vertically. The cavity between the ledge that runs over the underside of the side protrusion to the vertebral body and the parapophysis, divided in two by an additional ledge, is lacking inIlokelesia . There are no indications that these differences could be due to an age difference: in relatives they do not change during growth, although it should be borne in mind that not many growth sequences are known."
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Ilokelesia is an abelisaur, not really relevant to the synonymy with Gualicho.
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This is refuting that Huinculsaurus is a young Ilokelesia, as mentioned in the paper:
"Although fragmentary, Huinculsaurus shows a unique mix of features which differentiates it from all other theropods, including the sympatric abelisaurid Ilokelesia, and is diagnosed by prezygapophyseal articular facets twice longer than wide, anterior centroparapophyseal lamina strongly developed as an extensive lateral lamina in the posterior dorsal vertebrae, pneumatic foramina located ventrally to the postzygodiapophyseal lamina in the posterior dorsal vertebrae, posteriorly tapering postzygapophysis pointed posteriorly, and an accessory lamina bisecting the parapophyseal centrodiapophyseal fossa in the posterior dorsal neural arches. Phylogenetic analyses recovered Huinculsaurus as most closely related to the Late Jurassic Elaphrosaurus than to other Cretaceous abelisauroids, suggesting the persistence of the elaphrosaurine lineage in South America up to the early Late Cretaceous."
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Again I’m proposing a synonymy with Gualicho, not with Ilokelesia.
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Do you have a paper regarding that?
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Of course not, the Huinculsaurus description just came out.
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Alright, so why are you so certain that Huinculsaurus isn't valid? I mean, don't get me wrong, I understand everyone and their mothers wants to name a new dinosaur, but it seems a bit hasty to cast doubt so soon.
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Like I said, because the only character used to distinguish the two is not diagnostic, they are both from the same formation, and both are probably noasaurids of some kind.
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Not at all. There is less evidence to support its distinction than its synonymy with Gualicho.
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I'm finding two papers that show it to be valid. I think it is too soon to start casting doubt when it was literally just described recently.
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How are you finding two papers when there is only one paper describing Huinculsaurus that was just published? It's never too soon to cast doubt on a taxon, especially when the description contains major oversights like not including Gualicho in their phylogenetic analysis and using a single undiagnostic character to distinguish Huinculsaurus.
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looks a little like elaphrosaurus
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