Temat: Carnian - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Cynodont teeth from the Carnian [Late Triassic] of Northern Italy
Autorzy:: Renesto, S
Lucas, S.G.
Powiązania:: https://bibliotekanauki.pl/articles/21889.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: paleontology
cynodont
Carnian
Late Triassic
Italy
Gorno Formation
morphology
tooth
cynodont tooth
Opis:: A jaw fragment with three teeth preserved, collected from the Gorno Formation (Carnian, Upper Triassic) of Lombardy (Italy) is described. The teeth are transversely elongated, threecusped and bear anterior and posterior cingula. Their overall morphology supports their identification as postcanines of a “eucynodontian”. The unique tooth morphology of the new specimen supports its attribution to a new genus and species, while at the same time precluding positive assignment to already known gomphodont families. There is a fairly small record of gomphodont cynodonts in Europe, so that the described specimen adds to the knowledge of the distribution and diversity of European gomphodonts and it also represents the first ever collected in Italy.
Źródło:: Acta Palaeontologica Polonica; 2009, 54, 2; 357-360
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Functional morphology and biomechanics of the cynodont Trucidocynodon riograndensis from the Triassic of Southern Brazil: Pectoral girdle and forelimb
Autorzy:: de Oliveira, T.V.
Schultz, C.L.
Powiązania:: https://bibliotekanauki.pl/articles/20204.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: functional morphology
biomechanics
cynodont
Trucidocynodon riograndensis
Cynodontia
Trucidocynodon
limb posture
Carnian
Triassic
Brazil
pectoral girdle
forelimb
Opis:: Non-mammalian cynodonts provide insights on several points about mammalian evolution, such as the postural change and locomotory advances within the group. Unfortunately, complete skeletons of Triassic cynodonts are rather uncommon and where more complete specimens are found they can offer a global vision on some traits not available from partial specimens. This is the case of the cynodont Trucidocynodon riograndensis, from the Triassic of Brazil, that has preserved its forelimbs providing some insights into locomotory properties. The movements between interclavicle and clavicle must have been limited, as such as those occurring between the latter and the scapulocoracoid although the long acromion process of this should have permitted a greater degree of freedom. Some of the more significant movements were those on the shoulder joint, in which the maximum adduction should have been ca. 35º relative to the parasagittal plane and the greater abduction ca. 55º. The maximum adduction occurred when the humerus was in the more retracted position during stride and the variation in the adduction/abduction should have been significant to the limb posture during its recovery stroke. The long olecranon and the distal overlapping between radius and ulna suggest the predominance of simple flexion/extension on the forearm without significant pronation/supination. The poorly preserved hand suggests that Trucidocynodon could have evolved a slight semidigitigrad condition in its forelimbs. All these features give to this cynodont an important role in the evolution of the mammalian locomotory properties indicating that some features, such as the possibility of greater humeral adduction, evolved early in cynodont lineage.
Źródło:: Acta Palaeontologica Polonica; 2016, 61, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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