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Registros recuperados: 4
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Eggshell and Histology Provide Insight on the Life History of a Pterosaur with Two Functional Ovaries Anais da ABC (AABC)
WANG,XIAOLIN; KELLNER,ALEXANDER W. A.; CHENG,XIN; JIANG,SHUNXING; WANG,QIANG; SAYÃO,JULIANA M.; RODRIGUES,TAISSA; COSTA,FABIANA R.; LI,NING; MENG,XI; ZHOU,ZHONGHE.
The counterpart of a previously described non-pterodactyloid pterosaur with an egg revealed the presence of a second egg inside the body cavity of this gravid female. It clearly shows that pterosaurs had two functional oviducts and demonstrates that the reduction of one oviduct was not a prerequisite for developing powered flight, at least in this group. Compositional analysis of one egg suggests the lack of a hard external layer of calcium carbonate. Histological sections of one femur lack medullary bone and further demonstrate that this pterosaur reached reproductive maturity before skeletal maturity. This study shows that pterosaurs laid eggs even smaller than previously thought and had a reproductive strategy more similar to basal reptiles than to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Wukongopteridae; Reproductive Biology; Jurassic; China.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401599
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Pterodactyloid pterosaur bones from Cretaceous deposits of the Antarctic Peninsula Anais da ABC (AABC)
KELLNER,ALEXANDER W.A.; RODRIGUES,TAISSA; COSTA,FABIANA R.; WEINSCHÜTZ,LUIZ C.; FIGUEIREDO,RODRIGO G.; SOUZA,GEOVANE A. DE; BRUM,ARTHUR S.; ELEUTÉRIO,LÚCIA H.S.; MUELLER,CARSTEN W.; SAYÃO,JULIANA M..
Abstract Fossil vertebrates from Antarctica are considerably rare, hampering our understanding of the evolutionary history of the biota from that continent. For several austral summers, the PALEOANTAR project has been carrying out fieldwork in the Antarctic Peninsula in search for fossils, particularly Cretaceous vertebrates. Among the specimens recovered so far are two bones referable to Pterosauria, more specifically to the Pterodacyloidea, the first volant reptiles from Antarctica to be fully described. MN 7800-V (part and counterpart) was recovered from a moraine at the Abernathy Flats (Santa Marta Formation, Lachman Crags Member, Santonian-Campanian) on James Ross Island. It is interpreted as the distal articulation of a first phalanx of the wing...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antarctica; Antarctic Peninsula; Pterosauria; PALEOANTAR; Cretaceous.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400519
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The Evolution of Pneumatic Foramina in Pterosaur Vertebrae Anais da ABC (AABC)
BUCHMANN,RICHARD; RODRIGUES,TAISSA.
Abstract: Pterosaurs possess skeletal pneumatization, which can be assessed externally through the observation of pneumatic foramina. These foramina vary in position, shape, and number among taxa. Here we propose new characters referring to the position and number of pneumatic foramina present in cervical and dorsal vertebrae of pterosaurs. A cladistic analysis was performed after first-hand study of material in collections and using data from the literature in order to test these new characters for homology, and they were subsequently mapped in a strict consensus tree. The analysis resulted in nine equally parsimonious trees with 215 steps each. The strict consensus tree obtained does not present significant differences in relation to trees obtained in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Phylogeny; Axial skeleton; Skeletal pneumatization.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400601
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The largest flying reptile from Gondwana: a new specimen of Tropeognathus cf. T. mesembrinusWellnhofer, 1987 (Pterodactyloidea, Anhangueridae) and other large pterosaurs from the Romualdo Formation, Lower Cretaceous, Brazil Anais da ABC (AABC)
KELLNER,ALEXANDER W. A.; CAMPOS,DIOGENES A.; SAYÃO,JULIANA M.; SARAIVA,ANTÔNIO A.F.; RODRIGUES,TAISSA; OLIVEIRA,GUSTAVO; CRUZ,LILIAN A.; COSTA,FABIANA R.; SILVA,HELDER P.; FERREIRA,JENNYFER S..
A very large pterosaur (MN 6594-V) from the Romualdo Formation (Aptian/Albian), Santana Group, Araripe Basin, is described. The specimen is referred to Tropeognathus cf. T. mesembrinus mainly due to the presence of a low and blunt frontoparietal crest, the comparatively low number of teeth and the inclined dorsal part of the occipital region. Two distinct wingspan measurements for pterosaurs are introduced: the maximized wingspan (maxws), which essentially consists of doubling the addition of all wing elements and the length of the scapula or the coracoid (the smaller of the two), and the normal wingspan (nws), which applies a reducing factor (rfc) to the maximized wingspan to account for the natural flexures of the wing. The rfc suggested for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Anhangueridae; Tropeognathus; Cretaceous; Gondwana.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100113
Registros recuperados: 4
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