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Wyświetlanie 1-3 z 3
Tytuł:
Carapace bone histology in the giant pleurodiran turtle Stupendemys geographicus: phylogeny and function
Autorzy:
Scheyer, T M
Sanchez-Villagra, M.R.
Powiązania:
https://bibliotekanauki.pl/articles/20658.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
bone histology
Pleurodira
phylogenesis
bone analysis
Miocene
Stupendemys geographicus
Pelomedusoides
bone microstructure
giant pleurodiran turtle
Testudines
Bothremydidae
Podocnemidae
paleontology
Opis:
Stupendemys geographicus (Pleurodira: Pelomedusoides: Podocnemidae) is a giant turtle from the Miocene of Venezuela and Brazil. The bone histology of the carapace of two adult specimens from the Urumaco Formation is described herein, one of which is the largest of this species ever found. In order to determine phylogenetic versus scaling factors influencing bone histology, S. geographicus is compared with related podocnemid Podocnemis erythrocephala, and with fossil and Recent pelomedusoides taxa Bothremys barberi, Taphrosphys sulcatus, “Foxemys cf. F. mechinorum”, and Pelomedusa subrufa. Potential scaling effects on bone histology were further investigated by comparison to the Pleistocene giant tortoise Hesperotestudo (Caudochelys) crassiscutata and the Late Cretaceous marine protostegid turtle Archelon ischyros. A diploe structure of the shell with well developed external and internal cortices framing interior cancellous bone is plesiomorphic for all sampled taxa. Similarly, the occurrence of growth marks in the shell elements is interpreted as plesiomorphic, with the sampled neural elements providing the most extensive record of growth marks. The assignment of S. geographicus to the Podocnemidae was neither strengthened nor refuted by the bone histology. A reduced thickness of the internal cortex of the shell elements constitutes a potential synapomorphy of the Bothremydidae. S. geographicus and H. crassiscutata both express extensive weight−reduction through lightweightconstruction while retaining form stability of the shell. The bone histology of A. ischyros presents features likely related to an open marine lifestyle.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Presence of the Asian horse Sinohippus in the Miocene of Europe
Autorzy:
Salesa, M J
Sanchez, I.M.
Morales, J.
Powiązania:
https://bibliotekanauki.pl/articles/22447.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
browser
Anchitheriinae
Asian horse
Miocene
horse
Antchitherium
Mammalia
Europe
Sinohippus
Spain
paleontology
Opis:
The Anchitheriinae are a group of browsing horses with a widespread distribution throughout the Miocene. The subfamily includes the genera Hypohippus, Megahippus, Kalobatippus, Anchitherium, and Sinohippus. In the present paper we compare the remains of a giant anchitherine from the Spanish site of Nombrevilla−1, “Anchitherium” sampelayoi, with other species of Anchitherium from Europe, the North American genera Megahippus and Hypohippus, and the Asian genus Sinohippus. These comparisons allow us to suggest the inclusion of this large Spanish browsing horse in the Asian genus Sinohippus, rather than in Anchitherium. This proposal is made on the basis of some morphological traits from the upper cheek teeth of the Nombrevilla−1 fossils, and their large size, which clearly is outside the range of all other known European Anchitherium.
Źródło:
Acta Palaeontologica Polonica; 2004, 49, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new species of glirid rodent Vasseuromys from the Aragonian (Miocene) of the Ebro Basin (north-eastern Spain)
Autorzy:
Ruiz-Sanchez, F.J.
Murelaga, X.
Freudenthal, M.
Larrasoana, J.C.
Garces, M.
Powiązania:
https://bibliotekanauki.pl/articles/19965.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
new species
glirid rodent
rodent
Vasseuromys
Aragonia
Miocene
Ebro Basin
Spain
paleontology
Mammalia
Rodentia
Gliridae
systematics
Opis:
We describe a new species of Vasseuromys from the locality of Pico del Fraile 2 (PF2) in the Ebro Basin of northeastern Spain, which has yielded a fauna comprising several rodents and insectivores (Eumyarion cf. weinfurteri, Megacricetodon cf. primitivus, Democricetodon aff. hispanicus, Spermophilinus cf. besana, Microdyromys cf. legidensis, Galerix sp., and Lagomorpha indet.) indicative of Aragonian zones C or D. Vasseuromys cristinae sp. nov. differs from other Vasseuromysspecies in the constant presence of four extra ridges on the lower molars, one of them being connected to the posterolophid in the posterior valley, as well as three extra ridges on the upper molars, with none of them located outside the trigone. Morphological comparisons of this new taxon to other Vasseuromys species from the western Mediterranean area allow the reconstruction of their phylogenetic interrelationships during the Early and Middle Miocene of Europe, suggesting that V. cristinae sp. nov. is a descendant of V. autolensis.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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