Chucarosaurus

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Chucarosaurus
Temporal range: Late Cretaceous, Cenomanian–Turonian
Skeletal diagram of Chucarosaurus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: †Sauropodomorpha
Clade: †Sauropoda
Clade: †Macronaria
Clade: †Titanosauria
Clade: †Colossosauria
Genus: †Chucarosaurus
Agnolin et al., 2023
Species:
†C. diripienda
Binomial name
†Chucarosaurus diripienda
Agnolin et al., 2023

Chucarosaurus (meaning "indomitable reptile") is an

titanosaurian dinosaur from the Late Cretaceous (middle Cenomanian–lower Turonian) Huincul Formation of Argentina. The genus contains a single species, C. diripienda, known from various limb and pelvic bones.[1]

Discovery and naming

The Chucarosaurus

metacarpal II, left ischium, partial left femur and fibula, partial right tibia, and partial indeterminate metapodial, all of which belong to one individual. An additional specimen (MPCA PV 821), consisting of a left femur and tibia, was assigned as the paratype.[1]

In 2023, Agnolin et al. described Chucarosaurus diripienda, a new genus and species of colossosaurian titanosaurs, based on these fossil remains. The generic name, "Chucarosaurus", combines "chucaro", a Quechua word meaning "hard and indomitable animal" with the Latin word "saurus", meaning "reptile". The specific name, "diripienda", is derived from a Latin word meaning "scrambled".[1]

Description

Life restoration

Chucarosaurus was a large, slender-limbed titanosaur. Its

brachiosaurids. As in other colossosaurs, the deltopectoral crest of the humerus was thickened in its distal half. The ischium has a shorter, more robust iliac peduncle than in other titanosaurs.[1]

Classification

Size of Chucarosaurus compared to a human

Agnolin et al. (2023) recovered Chucarosaurus as a

phylogenetic analyses are shown in the cladogram below:[1]

Colossosauria

Palaeoenvironment

Size of several dinosaurs from the Huincul Formation compared to a human

Chucarosaurus is known from the Late Cretaceous Huincul Formation of Río Negro Province, Argentina. Many dinosaurs, including fellow titanosaurs (

elasmarian ornithopods are also known.[1]

References

  1. ^
    ISSN 0195-6671
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  2. doi:10.4202/app.01086.2023
    .
  3. ^ Calvo, Jorge O.; Salgado, Leonardo (1995). "Rebbachisaurus tessonei sp. nov. a new Sauropoda from the Albian-Cenomanian of Argentina; new evidence on the origin of the Diplodocidae" (PDF). Gaia. 11: 13–33. Archived from the original (PDF) on 23 September 2021.
  4. ISSN 0891-2963
    .
  5. S2CID 250343124
    .
  6. S2CID 214118853
    .
  7. S2CID 213781725
    .
  8. S2CID 218913199
    .
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