Temat: Cynodontia - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A new tritylodontid from the Upper Jurassic of Xinjiang, China
Autorzy:: Hu, Y
Meng, J.
Clark, J.M.
Powiązania:: https://bibliotekanauki.pl/articles/22519.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: new tritylodontid
tritylodontid
Upper Jurassic
Jurassic
paleontology
Xinjiang
China
Tritylodontidae
Cynodontia
cynodont
Yuanotherium minor
Opis:: A new genus and species of Tritylodontidae, Yuanotherium minor, is described and compared with other known tritylodontids. The new taxon is represented by a partially preserved upper jaw with three postcanines, collected from the upper part of the Shishugou Formation (Oxfordian, Late Jurassic) in the Wucaiwan area of the Junggar Basin, northwestern Xinjiang, China. Like other tritylodontids its maxillary teeth have three rows of blade−like trenchant cusps separated by deep furrows. The new species differs from other tritylodontids mainly in having posteriormost two cusps of the median row on upper postcanines closely placed. The new tritylodontid may have been omnivorous rather than herbivorous, as previously suggested for tritylodontids in general.
Źródło:: Acta Palaeontologica Polonica; 2009, 54, 3; 385-391
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Bone microstructure and growth patterns of early mammals
Autorzy:: Chinsamy, A
Hurum, J.H.
Powiązania:: https://bibliotekanauki.pl/articles/23349.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: fossil record
Eutheria
mammal
Cretaceous
Mammalia
growth rate
Early Jurassic
Morganucodonta
Multituberculata
paleontology
bone microstructure
Cynodontia
Opis:: We present results of the first studies of the bone microstructure of early mammals, based on the Early Jurassic Morganucodon, the Late Cretaceous multituberculates, Kryptobaatar and Nemegtbaatar, and the Late Cretaceous eutherians Zalambdalestes and Barunlestes. Our results show that the two eutherian taxa grew relatively slowly with periodic pauses in growth indicated by the presence of rest lines, while the multituberculates and Morganucodon had a faster rate of bone formation that suggests an overall rapid growth rate that slowed down later in ontogeny. Comparisons of the early mammalian bone microstructure with that of non−mammalian cynodonts, extant monotremes, and placentals are also made, and significant differences in the rate of osteogenesis in the various groups are documented. Our findings suggest differences in the growth rate between the multituberculates and the Mesozoic eutherians, and moreover, both groups appear to have slower growth rates as compared to modern monotremes and placentals. Our results further suggest that the determinate growth strategy typical of extant mammals evolved early in the evolution of the non−mammalian therapsids. We speculate that the sustained, uninterrupted bone formation among the multituberculates may have been an adaptive attribute prior to the K−T event, but that the flexible growth strategy of the early eutherians was more advantageous thereafter.
Źródło:: Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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