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CHROMOGISAURUS

an omnivorous non-sauropod sauropodomorph from the Late Triassic of Argentina.
image
Pronunciation: KROH-mo-gee-SOR-us
Meaning: Painted Valley Lizard
Author/s: Ezcurra (2010)
Synonyms: None known
First Discovery: San Juan, Argentina
Chart Position: 584

Chromogisaurus novasi

Chromogisaurus and Panphagia were both discovered in the Ischigualasto Formation of San Juan and were described by two different authors nearly simultaneously. Some paleontologists wondered if the relevant notes had been compared or if two specimens of the same critter were being scrutinised, and the fact that the former was still mostly stuck in bone-obscuring matrix when it was heralded as an all new species did little to sooth their understandable scepticism.

With Chromogisaurus fully prepared for a more thorough description three years later, Ricardo N. Martínez realised that what had initially been identified as an ulna was actually a lower jawbone (possibly of the rhynchosaur, Scaphonyx), a metatarsal was in fact a chevron, and an ischium probably wasn't. But as much by luck as by judgement, Chromogisaurus proved to be a valid, stand-alone genus that brought the total number of Ischigualasto Formation dinosaurs to five, and three of those are basal sauropodomorphs.

Behind Pamphagia and Eoraptor (which was described a decade earlier as a theropod, and may yet turn out to be one), Chromogisaurus was the area's third named sauropodomorph, but its more immediate family — Guabasauridae — seems to be on the verge of collapse. Like Eoraptor, the group anchor Guaibasaurus was initially identified as a theropod and probably is, and the other guaibasaurids, including Chromogisaurus, may just be a ragtag bunch of troublesome omnivores that aren't closely related at all.
(Novas's Painted Valley Lizard)Etymology
Chromogisaurus is derived from the Greek "chroma" (color) and "gi" (ground or land) in reference to the Painted Valley (Valle Pintado) where the specimen was collected, and "sauros" (lizard).
The species epithet, novasi, honors Argentine paleontologist Fernando Emilio Novas.
Discovery
The remains of Chromogisaurus were discovered in the Cancha de Bochas Member of the Ischigualasto Formation, Valle Pintado, Ischigualasto Provincial Park, San Juan Province, Argentina. The holotype (PVSJ 846) consists of bits of the front and hind limbs, the pelvis and two caudal (tail) vertebrae.
Estimations
Timeline:
Era: Mesozoic
Epoch: Triassic
Stage: Carnian
Age range: 237-228 mya
Stats:
Est. max. length: 1.5 meters
Est. max. hip height: ?
Est. max. weight: 10 Kg
Diet: Omnivore
Family Tree:
Dinosauria
Saurischia
Guaibasauridae
Saturnaliinae
Chromogisaurus
novasi
References
• Ezcurra MD (2010) "A new early dinosaur (Saurischia: Sauropodomorpha) from the Late Triassic of Argentina: a reassessment of dinosaur origin and phylogeny".
Journal of Systematic Palaeontology, Vol. 8, Issue 3, September 2010, pp 371–425.
• Brusatte SL (2012) Dinosaur Paleobiology (TOPA Topics in Paleobiology)".
• Brett-Surman, Holtz and Farlow (2012) "The Complete Dinosaur: Second Edition".
• Martínez RN, Apaldetti C and Abelin D (2013) "Basal sauropodomorphs from the Ischigualasto Formation". Journal of Vertebrate Paleontology, Volume 32, No. 6, Issue sup1: Memoir 12, pp 51-69.
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To cite this page:
Atkinson, L. "CHROMOGISAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 28th Mar 2017.
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