Diferencia entre revisiones de «Drepanosauridae»
Página creada con «{{enobras}} {{Ficha de taxón | name = Drepanosauridae | fossil_range = Triásico | image = Drepanosaurus unguicaudatus.JPG | image_width = 250px | image_caption = Esp...» |
(Sin diferencias)
|
Revisión del 00:08 4 dic 2011
| Drepanosauridae | ||
|---|---|---|
| Rango temporal: Triásico | ||
 Espécimen fósil de Drepanosaurus unguicaudatus. | ||
| Taxonomía | ||
| Reino: | Animalia | |
| Filo: | Chordata | |
| Clase: | Sauropsida | |
| Subclase: | Diapsida | |
| Infraclase: | Archosauromorpha | |
| Sección: | Drepanosauromorpha | |
| Familia: |
Drepanosauridae Pinna, 1979 | |
| Géneros | ||
| Sinonimia | ||
Megalancosauridae (Renesto, 1994) | ||
Drepanosauridae es una extraña familia de arcosauromorfos que vivieron en el Triásico en lo que ahora es Norteamérica, Europa y Asia.[1][2] Los drepanosáuridos were characterized by odd specialized grasping limbs and often prehensile tails, adaptions for arboreal (tree-dwelling), and/or possibly aquatic lifestyles. Se han encontrado fósiles en Kirguistán, Arizona, Nuevo México, Nueva Jersey, Inglaterra y el norte de Italia.
= Descripción
Drepanosaurs are notable for their distinctive, triangular skulls, which resemble the skulls of birds. Some drepanosaurs, such as Hypuronector, had pointed, toothless, bird-like beaks. This similarity to birds may have led to the possible mis-attribution of a drepanosaur skull to the would-be "first bird", Protoavis.[3]
Drepanosaurs featured a suite of bizarre, almost chameleon-like skeletal features. Above the shoulders of most species was a specialized "hump" formed from fusion of the vertebrae, possibly used for advanced muscle attachments to the neck, and allowing for quick forward-striking movement of the head (perhaps to catch insects). Many had derived hands with two fingers opposed to the remaining three, an adaptation for grasping branches. Some individuals of Megalancosaurus (possibly exclusive to either males or females) had a primate-like opposable toe on each foot, perhaps used by one sex for extra grip during mating. Most species had broad, prehensile tails, sometimes tipped with a large "claw", again to aid in climbing. These tails, tall and flat like those of newts and crocodiles, have led some researches to conclude that they were aquatic rather than arboreal. In 2004, Senter dismissed this idea, while Colbert and Olsen, in their description of Hypuronector, state that while other drepanosaurs were probably arboreal, Hypuronector was uniquely adapted to aquatic life.[4] The tail of this genus was extremely deep and non-prehensile – much more fin-like than members of the more exclusive group Drepanosauridae.[5]
Clasificación
Desde su descubrimiento, la posición filogenética de los drepanosáuridos ha variado mucho.[4][6]
Cladograma según Renesto y colaboradores (2010):[7]
| Drepanosauromorpha |
| ||||||||||||||||||||||||
Referencias
- ↑ V. R. Alifanov and E. N. Kurochkin (2011). «Kyrgyzsaurus bukhanchenkoi gen. et sp. nov., a new reptile from the triassic of southwestern Kyrgyzstan». Paleontological Journal 45 (6): 639-647. doi:10.1134/S0031030111060025.
- ↑ Renesto, S., Spielmann, J.A., and Lucas, S.G. (2009). "The oldest record of drepanosaurids (Reptilia, Diapsida) from the Late Triassic (Adamanian Placerias Quarry, Arizona, USA) and the stratigraphic range of the Drepanosauridae." Neues Jahrbuch für Geologie und Paläontologie Abhandlungen, 252(3): 315-325. doi: 10.1127/0077-7749/2009/0252-0315.
- ↑ Renesto, S. (2000). "Bird-like head on a chameleon body: new specimens of the enigmatic diapsid reptile Megalancosaurus from the Late Triassic of northern Italy." Rivista Italiana di Paleontologia e Stratigrafia, 106: 157–180. Abstract
- ↑ a b Senter, P. (2004). "Phylogeny of Drepanosauridae (Reptilia: Diapsida)." Journal of Systematic Palaeontology, 2(3): 257-268.
- ↑ Colbert, E. H., and Olsen, P. E. (2001). "A new and unusual aquatic reptile from the Lockatong Formation of New Jersey (Late Triassic, Newark Supergroup)." American Museum Novitates, 3334: 1-24.
- ↑ Renesto, S. (1994). "Megalancosaurus, a possibly arboreal archosauromorph (Reptilia) from the Upper Triassic of northern Italy." Journal of Vertebrate Paleontology, 14(1): 38-52.
- ↑ Silvio Renesto, Justin A. Spielmann, Spencer G. Lucas, and Giorgio Tarditi Spagnoli. (2010). The taxonomy and paleobiology of the Late Triassic (Carnian-Norian: Adamanian-Apachean) drepanosaurs (Diapsida: Archosauromorpha: Drepanosauromorpha). New Mexico Museum of Natural History and Science Bulletin. 46:1–81.
Enlaces Externos
- Monkey Lizards of the Triassic - Artículo ilustrado sobre drepanosáuridos de HMNH.
- Prof. Silvio Renesto—Vertebrate Paleontology at Insubria University: Research - Imágenes y discusión sobre Drepanosaurus.
- Prof. Silvio Renesto—Vertebrate Paleontology at Insubria University: Research - Imágenes y discusión sobre Megalancosaurus.