Wewrzeœniu 2008 r. odby3a sie polsko-rosyjska ekspedycja do dwoch permsko-triasowych stanowisk pa... more Wewrzeœniu 2008 r. odby3a sie polsko-rosyjska ekspedycja do dwoch permsko-triasowych stanowisk paleontologicznych w europejskiej czeœci Rosji (ryc. 1). Wyprawa zosta3a zorganizowana przez Instytut Paleobiologii Polskiej Akademii Nauk oraz Instytut Paleontologii Rosyjskiej Akademii Nauk we wspo3pracy z wydzia3ami Biologii i Geologii Uniwersytetu Warszawskiego. Uczestnikami wyprawy byli: dr Andriej Sennikov (Instytut Paleontologii Rosyjskiej Akademii Nauk), dr Tomasz Sulej i Marian Dziewinski (Instytut Paleobiologii Polskiej Akademii Nauk), Robert Bronowicz, Grzegorz NiedŸwiedzki i Mateusz Ta3anda (Uniwersytet Warszawski). Celem ekspedycji by3o poznanie i wstepna dokumentacja poŸnopermskich i wczesnotriasowych stanowisk geologiczno-paleontologicznych w okolicachWjaznik (ryc. 2) i Rybinska (Ochev & Surkov, 2000), okreœlenie ich pozycji stratygraficznej oraz poszukiwania skamienia3oœci
The oldest feathers known to date have been found in archosaurs capable of flight. However, some ... more The oldest feathers known to date have been found in archosaurs capable of flight. However, some of them (scansoriopterygids) flew by the use of a membrane rather than feathers. We therefore propose a new mechanism for the origin of avian flight by the use of membranous wings on both the forelimbs and the hindlimbs. It complements Beebe’s (1915) prediction of the tetrapteryx stage. Paleontological and embryological evidence suggest that feathers are a modification of reptilian scales. Scansoriopterygids were covered mostly by down-like feathers which seemingly acted as thermal isolation rather than being adapted for flight. Certain early birds, including scansoriopterygids, possessed elongate shafted tail feathers, which were probably used principally for display and resembled elongate scales. We suppose that display is the primary function of early feathers, which were preadapted for thermal isolation and also flight. The body of theropods was covered mostly by typical reptilian sc...
Here, we describe the dicynodont Lisowicia bojani, from the Late Triassic of Poland, a gigantic s... more Here, we describe the dicynodont Lisowicia bojani, from the Late Triassic of Poland, a gigantic synapsid with seemingly upright subcursorial limbs that reached an estimated length of more than 4.5 meters, height of 2.6 meters, and body mass of 9 tons. Lisowicia is the youngest undisputed dicynodont and the largest nondinosaurian terrestrial tetrapod from the Triassic. The lack of lines of arrested growth and the highly remodeled cortex of its limb bones suggest permanently rapid growth and recalls that of dinosaurs and mammals. The discovery of Lisowicia overturns the established picture of the Triassic megaherbivore radiation as a phenomenon restricted to dinosaurs and shows that stem-group mammals were capable of reaching body sizes that were not attained again in mammalian evolution until the latest Eocene.
Http Dx Doi Org 10 2110 Palo 2010 P10 024r, Jan 26, 2011
... Although other groups of terrestrial animals are not excluded, only therapsids are satisfacto... more ... Although other groups of terrestrial animals are not excluded, only therapsids are satisfactorily well known from body fossils found inside ... Excavating burrows could be one of the first behaviors connected with caring for young. ... Journal of Vertebrate Paleontology v. 28:p. 277284 ...
Wewrzeœniu 2008 r. odby3a sie polsko-rosyjska ekspedycja do dwoch permsko-triasowych stanowisk pa... more Wewrzeœniu 2008 r. odby3a sie polsko-rosyjska ekspedycja do dwoch permsko-triasowych stanowisk paleontologicznych w europejskiej czeœci Rosji (ryc. 1). Wyprawa zosta3a zorganizowana przez Instytut Paleobiologii Polskiej Akademii Nauk oraz Instytut Paleontologii Rosyjskiej Akademii Nauk we wspo3pracy z wydzia3ami Biologii i Geologii Uniwersytetu Warszawskiego. Uczestnikami wyprawy byli: dr Andriej Sennikov (Instytut Paleontologii Rosyjskiej Akademii Nauk), dr Tomasz Sulej i Marian Dziewinski (Instytut Paleobiologii Polskiej Akademii Nauk), Robert Bronowicz, Grzegorz NiedŸwiedzki i Mateusz Ta3anda (Uniwersytet Warszawski). Celem ekspedycji by3o poznanie i wstepna dokumentacja poŸnopermskich i wczesnotriasowych stanowisk geologiczno-paleontologicznych w okolicachWjaznik (ryc. 2) i Rybinska (Ochev & Surkov, 2000), okreœlenie ich pozycji stratygraficznej oraz poszukiwania skamienia3oœci
The oldest feathers known to date have been found in archosaurs capable of flight. However, some ... more The oldest feathers known to date have been found in archosaurs capable of flight. However, some of them (scansoriopterygids) flew by the use of a membrane rather than feathers. We therefore propose a new mechanism for the origin of avian flight by the use of membranous wings on both the forelimbs and the hindlimbs. It complements Beebe’s (1915) prediction of the tetrapteryx stage. Paleontological and embryological evidence suggest that feathers are a modification of reptilian scales. Scansoriopterygids were covered mostly by down-like feathers which seemingly acted as thermal isolation rather than being adapted for flight. Certain early birds, including scansoriopterygids, possessed elongate shafted tail feathers, which were probably used principally for display and resembled elongate scales. We suppose that display is the primary function of early feathers, which were preadapted for thermal isolation and also flight. The body of theropods was covered mostly by typical reptilian sc...
Here, we describe the dicynodont Lisowicia bojani, from the Late Triassic of Poland, a gigantic s... more Here, we describe the dicynodont Lisowicia bojani, from the Late Triassic of Poland, a gigantic synapsid with seemingly upright subcursorial limbs that reached an estimated length of more than 4.5 meters, height of 2.6 meters, and body mass of 9 tons. Lisowicia is the youngest undisputed dicynodont and the largest nondinosaurian terrestrial tetrapod from the Triassic. The lack of lines of arrested growth and the highly remodeled cortex of its limb bones suggest permanently rapid growth and recalls that of dinosaurs and mammals. The discovery of Lisowicia overturns the established picture of the Triassic megaherbivore radiation as a phenomenon restricted to dinosaurs and shows that stem-group mammals were capable of reaching body sizes that were not attained again in mammalian evolution until the latest Eocene.
Http Dx Doi Org 10 2110 Palo 2010 P10 024r, Jan 26, 2011
... Although other groups of terrestrial animals are not excluded, only therapsids are satisfacto... more ... Although other groups of terrestrial animals are not excluded, only therapsids are satisfactorily well known from body fossils found inside ... Excavating burrows could be one of the first behaviors connected with caring for young. ... Journal of Vertebrate Paleontology v. 28:p. 277284 ...
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