Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
New data on high-latitude hadrosaurid dinosaurs from the Upper Cretaceous Kakanaut Formation of Chukotka, Russia. / Бапинаев, Роман Альбертович; Головнёва, Лина; Золина, Анастасия Андреевна; Аверьянов, Александр; Скучас, Павел Петрович.
в: Cretaceous Research, Том 149, 105552, 01.09.2023.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
}
TY - JOUR
T1 - New data on high-latitude hadrosaurid dinosaurs from the Upper Cretaceous Kakanaut Formation of Chukotka, Russia
AU - Бапинаев, Роман Альбертович
AU - Головнёва, Лина
AU - Золина, Анастасия Андреевна
AU - Аверьянов, Александр
AU - Скучас, Павел Петрович
PY - 2023/9/1
Y1 - 2023/9/1
N2 - Fossils from high-latitude Mesozoic vertebrate localities provide a unique opportunity to reveal specific biological features and reconstruct adaptations to months of twilight and relatively low annual temperatures of polar dinosaurs. Here we provide morphological description of new hadrosaurid specimens (vertebrae, femora) and results of the histological analysis of hadrosaurid femora, proximal fragments of a humerus and a scapula from the Upper Cretaceous high-latitude (palaeolatitude estimate of 75°N) Kakanaut locality (Chukotka, Russia). The two studied hadrosaurid femora are different in size and form, but both are histologically mature and belong to fully grown adult individuals. This difference may indicate the presence of two different hadrosaurid taxa in the Kakanaut fauna. The bone histology of the Kakanaut dinosaurs does not differ from that of dinosaurs from lower latitudes and does not show specific histological features (namely, cyclic change of vascularization of the fibrolamellar bone, with sharply defined borders between cycles) found in polar Edmontosaurus from Alaska. This suggests that the Kakanaut hadrosaurid dinosaurs were not significantly stressed, and this may be the result of the local mild and weakly seasonal climate reconstructed from palaeobotanical data. We suggest that Arctic dinosaurs of Chukotka, like other polar dinosaurs, were year-round residents of paleopolar ecosystems.
AB - Fossils from high-latitude Mesozoic vertebrate localities provide a unique opportunity to reveal specific biological features and reconstruct adaptations to months of twilight and relatively low annual temperatures of polar dinosaurs. Here we provide morphological description of new hadrosaurid specimens (vertebrae, femora) and results of the histological analysis of hadrosaurid femora, proximal fragments of a humerus and a scapula from the Upper Cretaceous high-latitude (palaeolatitude estimate of 75°N) Kakanaut locality (Chukotka, Russia). The two studied hadrosaurid femora are different in size and form, but both are histologically mature and belong to fully grown adult individuals. This difference may indicate the presence of two different hadrosaurid taxa in the Kakanaut fauna. The bone histology of the Kakanaut dinosaurs does not differ from that of dinosaurs from lower latitudes and does not show specific histological features (namely, cyclic change of vascularization of the fibrolamellar bone, with sharply defined borders between cycles) found in polar Edmontosaurus from Alaska. This suggests that the Kakanaut hadrosaurid dinosaurs were not significantly stressed, and this may be the result of the local mild and weakly seasonal climate reconstructed from palaeobotanical data. We suggest that Arctic dinosaurs of Chukotka, like other polar dinosaurs, were year-round residents of paleopolar ecosystems.
KW - Cretaceous
KW - Dinosaurs
KW - Hadrosaurids
KW - Histology
KW - Polar latitudes
UR - https://www.mendeley.com/catalogue/f5763c46-b4d4-3a2f-9ebd-f8eeeb50b707/
U2 - 10.1016/j.cretres.2023.105552
DO - 10.1016/j.cretres.2023.105552
M3 - Article
VL - 149
JO - Cretaceous Research
JF - Cretaceous Research
SN - 0195-6671
M1 - 105552
ER -
ID: 104967758