Bonitasaura

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Bonitasaura
Temporal range:
Ma
↓
Right dentary
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: †Bonitasaura
Apesteguía, 2004
Type species
†Bonitasaura salgadoi
Apesteguía, 2004

Bonitasaura is a

fluvial sandstone, including a lower jaw with teeth, a partial vertebrae series, and limb bones, were described by Sebastian Apesteguía in 2004.[1]

The genus name Bonitasaura refers to the

paleontologist.[2]

Description

Illustration of the head

Bonitasaura measured 10 metres (33 ft) in length, and had a skull similar to another group of

diplodocids. The lower jaw had a distinctive, sharp ridge immediately behind a reduced set of teeth. This ridge supported in life a sharp, beak-like keratin sheath that probably paired with a similar structure in the upper jaw. The keratin sheath worked much like a guillotine
to crop vegetation raked into the mouth by the peg-like front teeth. This animal also had a rather short neck and robust projections of the back vertebrae for muscle attachment, indicating that the neck was used in vigorous exertions, probably during feeding.

Skeletal reconstruction of B. salgadoi.

Bonitasaura also shows that some lines of titanosaurian evolution converged with diplodocids, namely low long skulls without the characteristic nasal arches of other macronarians (such as Brachiosaurus or Camarasaurus) and lower jaws that were squared off and contained comb-like teeth (as in Rebbachisauridae), reversed limb proportions (the front limbs shorter than the hind limbs, unlike the condition in most other macronarians) and rudimentary whiplash tails. It also made the suggestion that the titanosaur Antarctosaurus is a chimera made up of a titanosaurian skull and body and a diplodocoid jaw, as proposed by some authors (McIntosh 1990; Jacobs et al. 1993; Upchurch 1999) less likely.[3][4][1][5]

Palaeopathologies

Multiple

prezygapophysis caused by an infection.[6]

Classification

Bonitasaura was originally classified as a member of

phylogenetic analyses are shown in the cladogram below:[9]

Colossosauria

References

  1. ^ a b Apesteguía, S. (2004). Bonitasaura salgadoi gen. et sp. nov.: a beaked sauropod from the Late Cretaceous of Patagonia. Naturwissenschaften, 91(10), 493-497.
  2. ^ Gallina, P. A. (2011). Notes on the axial skeleton of the titanosaur Bonitasaura salgadoi (Dinosauria-Sauropoda). Anais da Academia Brasileira de Ciências, 83(1), 235-246.
  3. ^ Jacobs, L., Winkler, D. A., Downs, W. R., & Gomani, E. M. (1993). New material of an Early Cretaceous titanosaurid saurepod dinosaur from Malawi. Palaeontology, 36, 523-523.
  4. ^ McIntosh, J. S. (1990). Species determination in sauropod dinosaurs with tentative suggestions for their classification. In Dinosaur systematics symposium (pp. 53-69).
  5. ^ Upchurch, P. (1999). The phylogenetic relationships of the Nemegtosauridae (Saurischia, Sauropoda). Journal of Vertebrate Paleontology, 19(1), 106-125.
  6. hdl:11336/64083
    . Retrieved 19 April 2024 – via Elsevier Science Direct.
  7. ^ Gallina & Apesteguí, 2015
  8. ^ Carballido, J. L., Pol, D., Otero, A., Cerda, I. A., Salgado, L., Garrido, A. C., ... & Krause, J. M. (2017). A new giant titanosaur sheds light on body mass evolution among sauropod dinosaurs. Proceedings of the Royal Society B: Biological Sciences, 284(1860), 20171219.
  9. ISSN 0195-6671
    .
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