SciELO - Scientific Electronic Library Online

 
vol.82 número4New long-tailed pterosaurs (Wukongopteridae) from western Liaoning, ChinaFertility and acidity status of latossolos (oxisols) under pasture in the Brazilian Cerrado índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Não possue artigos similaresSimilares em SciELO
  • Em processo de indexaçãoSimilares em Google
  • uBio

Compartilhar


Anais da Academia Brasileira de Ciências

versão impressa ISSN 0001-3765

Resumo

KELLNER, Alexander W.A.. Comments on the Pteranodontidae (Pterosauria, Pterodactyloidea) with the description of two new species. An. Acad. Bras. Ciênc. [online]. 2010, vol.82, n.4, pp.1063-1084. ISSN 0001-3765.  http://dx.doi.org/10.1590/S0001-37652010000400025.

Considered one of the best known flying reptiles, Pteranodon has been subject to several reviews in the last century. Found exclusively in the Upper Cretaceous Niobrara Formation and Pierre Shale Group 11 species have been attributed to this genus (excluding the ones presently regarded as representing Nyctosaurus). While reviewers agree that this number is inflated, there is disagreement on how many species can be identified. The last review recognized only two species (Pteranodon longiceps and Pteranodon sternbergi) both being sexually dimorphic. Based on several cranial features, some specimens previously referred to the genus Pteranodon are re-evaluated leading to the recognition of the following species, two of which new that are described here: Pteranodon longiceps, Geosternbergia sternbergi, Geosternbergia maiseyi sp. nov., and Dawndraco kanzai gen. et sp. nov. They differ mainly by features such as the direction and extension of the frontal crest, the angle and extension of the posterior process of the premaxillae, the shape and extension of the lower temporal fenestra and the length and proportion of the rostrum. The procedures to recognize a pterosaur species are also discussed here, and must take into account primarily morphology, in conjunction with stratigraphic and geographic data. Although well aware that changes in morphology not always reflect taxonomy, the lack of stratigraphic data and the limited number of specimens that can be confidently assigned to one species hampers our understanding on the morphological variations as a function of ontogeny, individual variation and sexual dimorphism. Although the present study has not eliminated the possibility to recognize such differences, caution is needed before models are generalized for pterosaurs.

Palavras-chave : Pterosauria; Pteranodon; Dawndraco; Late Cretaceous; Taxonomy.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf epdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons