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| ZHANG,JIALIANG; WANG,XIAOLIN; WANG,QIANG; JIANG,SHUNXING; CHENG,XIN; LI,NING; QIU,RUI. |
| ABSTRACT A new saurolophine hadrosaurid, Laiyangosaurus youngi gen. et sp. nov. is described and phylogenetically analyzed based on several cranial elements from the Jingangkou Formation, Wangshi Group, Upper Cretaceous of Laiyang, Shandong, China. Laiyangosaurus youngi differs from other members of the saurolophine clade on the basis of a number of autapomorphies, including a prominent and narrow ridge on the lateral side of the nasal which forms the posterodorsal and posterior margin of the circumnasal depression, a primary ridge that runs along most of the maxillary tooth row that is slightly deflected posteriorly, a retroarticular process of the surangular that is dorsolateroposteriorlly recurved, and orbital margins that are wider than the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Upper Cretaceous; Wangshi Group; Laiyangosaurus youngi; Saurolophinae; Shandong; China. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400503 |
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| 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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