Sexual Dimorphism in the Postcranial Skeleton of Dinosaurs

Tereshchenko, V. S.

doi:10.1134/s0031030120120047

Cited by 4 publications

(2 citation statements)

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“…Tereschchenko (2020), noted that male dinosaurs have adaptations generally associated with locomotor activity, such as taller neural spines and more robust limb bones than females. Conversely, females have adaptations for gestation and egg laying, with increased postacetabular pelvic width and tilting of the functional axis of the ischium.…”

Section: Discussionmentioning

confidence: 99%

“…However, this requires significant sampling of a determinate taxon, with a defined age composition, for a more detailed assessment of morphological differences in search of sexual patterns (Mallon, 2017). Tereschchenko (2020), noted that male dinosaurs have adaptations generally associated with locomotor activity, such as taller neural spines and more robust limb bones than females. Conversely, females have adaptations for gestation and egg laying, with increased postacetabular pelvic width and tilting of the functional axis of the ischium.…”

Section: Initial Evolution Of Femoral Robustness Within Sauropodomorphamentioning

confidence: 99%

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An unusually robust specimen attributed to Buriolestes schultzi (Dinosauria: Sauropodomorpha) from the Late Triassic of southern Brazil

Moro,

Damke,

Müller

et al. 2023

The Anatomical Record

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Buriolestes schultzi is a small sauropodomorph dinosaur from Carnian beds (ca., 233 Ma) of southern Brazil. It is one of the earliest members of that lineage and is a key taxon to investigate the initial evolution of Sauropodomorpha. Here, we attribute a new specimen to B. schultzi from Late Triassic of southern Brazil, which represents the first occurrence of the taxon outside the type locality. The new specimen comprises a disarticulated and partial skeleton, including cranial and postcranial elements. It is tentatively regarded as an additional specimen of B. schultzi according to a unique combination of traits (including autapomorphies). Conversely, the new specimen is stouter than the other specimens of B. schultzi, as shown by femoral Robustness Index. Based on femoral circumference, the estimated body mass of the new specimen is approximately 15 kg, which is far higher than the previous estimations for other specimens of B. schultzi (i.e., approximately 7 kg). In fact, the new specimen and some specimens of Eoraptor lunensis and Saturnalia tupiniquim were found to be significantly stouter than coeval sauropodomorphs. Therefore, instead of all being constructed as gracile, the earliest sauropodomorphs experienced an unappreciated intraspecific variation in robustness. This is interesting because more precise data on species body mass are crucial in order to better understand the complex terrestrial ecosystems in which dinosaurs originated.

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Section: Discussionmentioning

confidence: 99%

Section: Initial Evolution Of Femoral Robustness Within Sauropodomorphamentioning

confidence: 99%