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Pteranodon

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Pteranodon
Rango fosil: Cretaceo superior 86 Ma-84,5 Ma

Replica de un esqueleto de un P. longiceps macho, Museo Americano de Historia Natural
Clasificacion cientifica
Reino : Animalia
Filo : Chordata
Clase : Sauropsida
Orde : Pterosauria
Suborde: Pterodactyloidea
Superfamilia: Ornithocheiroidea
Familia : Pteranodontidae
Xenero : Pteranodon †
Marsh , 1876
Especies
Sinonimia

Pteranodon (do grego : πτερ?ν (pteron, "alado"; e ?ν?δων (anodon, "sen dentes"; ou "alado sen dentes") e un xenero de pterosauros pterodactiloideos , sendo un dos reptiles alados mais grandes que se conecen, cunha envergadura de arredor de sete metros. Viviu durante o periodo xeoloxico do Cretaceo superior e os seus restos fosiles foron atopados en America do Norte , nos actuais territorios de Kansas , Alabama , Nebrasca , Wyoming e Dacota do Sur . Descubrironse moitos especimes fosiles de Pteranodon , con mais de 1 200 especimes conecidos pola ciencia, suponendo mais que calquera outro tipo de pterosauro . Moitos deles estaban moi ben preservados con esqueletos articulados e caveiras case completas. Foi un membro importante da fauna do mar interior occidental . [ 1 ]

Caracteristicas [ editar | editar a fonte ]

Carecia practicamente de cola ; a sua cabeza era mais ancha que a das formas xurasicas, cunha prolongacion a modo de crista e sen dentes . A sua gran crista na parte posterior da cabeza probablemente axudaballe a equilibrar o peso do pico e da pesca. Pesou ata 20 kg e mediu ata 9 m de envergadura. As suas patas eran tan debiles que se dubida de que puidesen andar polo chan.

Dieta [ editar | editar a fonte ]

A sua dieta era piscivora (atopouse osos fosilizados de peixes no estomago dun especime). Seguramente empregaba o seu longo pico a modo de pa para capturar peces mentres voaba preto da superficie do mar. Unha bolsa baixo o pico permitialle almacenar peixe, como o pelicano actual.

Especies [ editar | editar a fonte ]

Describironse varias especies de Pteranodon , ainda que non todas estan ben fundamentadas. As mellor establecidas distinguense pola forma da crista; en Pteranodon longiceps e recta e dirixese cara a atras, mentres que en Pteranodon sternbergi e mais vertical e profunda.

Notas [ editar | editar a fonte ]

  1. ↑ Bennett, S.C. (2000). "Inferring stratigraphic position of fossil vertebrates from the Niobrara Chalk of western Kansas." Current Research in Earth Sciences: Kansas Geological Survey Bulletin , 244 (Part 1): 26 pp.

Vexase tamen [ editar | editar a fonte ]

Bibliografia [ editar | editar a fonte ]

  • Anonymous. 1872. On two new Ornithosaurians from Kansas. American Journal of Science , Series 3, 3(17):374?375. (Probably by O. C. Marsh)
  • Bennett, S. C. 2000. New information on the skeletons of Nyctosaurus . Journal of Vertebrate Paleontology 20(Supplement to Number 3): 29A. (Abstract)
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  • Bennett, S. C. (2007). "Articulation and function of the pteroid bone of pterosaurs". Journal of Vertebrate Paleontology 27 (4): 881?891. doi : 10.1671/0272-4634(2007)27[881:aafotp]2.0.co;2 .  
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  • Bonner, O. W. 1964. An osteological study of Nyctosaurus and Trinacromerum with a description of a new species of Nyctosaurus . Unpub. Masters Thesis, Fort Hays State University, 63 pages.
  • Brower, J. C. (1983). "The aerodynamics of Pteranodon and Nyctosaurus , two large pterosaurs from the Upper Cretaceous of Kansas". Journal of Vertebrate Paleontology 3 (2): 84?124. doi : 10.1080/02724634.1983.10011963 .  
  • Cope, E. D. 1872. On the geology and paleontology of the Cretaceous strata of Kansas. Annual Report of the U. S. Geological Survey of the Territories 5:318?349 (Report for 1871).
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  • Cope, E. D. (1874). "Review of the Vertebrata of the Cretaceous period found west of the Mississippi River". U. S. Geological Survey of the Territories Bulletin 1 (2): 3?48.  
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  • Everhart, M. J. 1999. An early occurrence of Pteranodon sternbergi from the Smoky Hill Member (Late Cretaceous) of the Niobrara Chalk in western Kansas. Transactions of the Kansas Academy of Science 18(Abstracts):27.
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  • Seeley, Harry G. 1871. Additional evidence of the structure of the head in ornithosaurs from the Cambridge Upper Greensand; being a supplement to "The Ornithosauria." The Annals and Magazine of Natural History , Series 4, 7:20?36, pls. 2?3. (Discovery of toothless pterosaurs in England)
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  • Williston, S. W. (1911). "The wing-finger of pterodactyls, with restoration of Nyctosaurus ". Journal of Geology 19 (8): 696?705. Bibcode : 1911JG.....19..696W . doi : 10.1086/621914 .  
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Ligazons externas [ editar | editar a fonte ]

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