Wszystkie pola: Chinsamy, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Growth and life habits of the Triassic cynodont Trirachodon, inferred from bone histology
Autorzy:: Botha, J
Chinsamy, A.
Powiązania:: https://bibliotekanauki.pl/articles/22174.pdf
Data publikacji:: 2004
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: histology
cynodont
Triassic
growth pattern
bone
life style
Trirachodon
growth
life habit
paleontology
Opis:: Growth pattern and lifestyle habits of the Triassic non−mammalian cynodont Trirachodon are deduced from bone histology and cross−sectional geometry. Several skeletal elements of Trirachodon were examined in order to document histological changes during ontogeny, as well as histovariability in the skeleton. The bone histology of all the elements consists of a moderately vascularized, periodically interrupted, fibro−lamellar bone tissue. This suggests that the overall growth of Trirachodon was probably rapid during the favourable season, but decreased or ceased during the unfavourable season. As the environment is thought to have been semi−arid with seasonal rainfall, it is possible that Trirachodon was sensitive to such environmental fluctuations. Some inter−elemental histovariability was noted where the number and prominence of growth rings varied. Limb bone cross−sectional geometry revealed a relatively thick bone wall and supports earlier proposals that Trirachodon was fossorial.
Źródło:: Acta Palaeontologica Polonica; 2004, 49, 4
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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