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Paleontologia

Sinodelphys

Se presenta en sociedad el pequeño mamífero cretácico Sinodelphys szalayi. Procede del mismo yacimiento chino y revolucionario de donde sacan a porrones dinosaurios con plumas. Parece ser un miembro primitivo del linaje que dio lugar a los marsupiales; el más antiguo hallado hasta el momento.



Esta página del Museo Carnegie proporciona información sobre el hallazgo y excelentes fotografías, ilustraciones y esquemas evolutivos. Y aquí os podéis descargar el artículo sobre Sinodelphys publicado en Science.

En la misma época y en el mismo lugar, vivió también el primer mamífero placentario conocido: Eomaia. Hace 125 millones de años, las dos ramas, la que lleva a los marsupiales y la nuestra, ya estaban separadas. Superficialmente, sin embargo, ambos representantes eran muy parecidos: diminutos arborícolas de unos 30 gramos de peso. En aquel mundo de reptiles, a los mamíferos aún no se les "permitía" ser ni canguros, ni tigres, ni ballenas, ni hombres.

2003-12-13 | Haz un comentario (hay 21)


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Comentarios

1
De: Algernon Fecha: 2003-12-13 09:00

Mis parientes lejanos, sniff

Fdo. Algernon - Mus Norvegicus Albinus



2
De: [Quique] Fecha: 2003-12-14 23:49

Por fin un bicho de sangre caliente, un paisano.



3
De: procompsognathus triassicus Fecha: 2006-09-27 21:48

en verda se lo deemo to al cindont (al estilo de mi tierra andalucia)



4
De: El rano verde Fecha: 2007-12-27 20:55

Jo, otro link roto, con lo majo que era el bicho. Venga, Sinodelphis, no te escondas:


http://www.carnegiemnh.org/news/03-oct-dec
/sinodelphys/sino2_72.jpg





5
De: El rano verde Fecha: 2007-12-27 21:02

Y el primo Eomaia también estaba escondido, es lo que tiene el ser pequeñito y peludo en el Cretácico temprano:

Aquí



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