Blog sobre paleontología de dinosaurios: ofrece noticias de actualidad, divulgación y exposición de algunos temas e ideas; entre otros.

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Albalophosaurus yamaguchiorum y el origen de Ceratopsia.

Albalophosaurus yamaguchiorum

Se trata de un nuevo Ceratopsia que ha sido hallado en la formación Kujawima (del grupo Tetori),en Hakusan, en la Prefectura de Ishikawa, en el japón central.
Ha sido clasificado como Ceratopsia basal, ya que presenta características ambiguas que lo relacionan tanto con Ceratopsia como con Ornithopoda, pudiendo por tanto situarse como taxón basal de Neuornitischia.
Sin embargo, la primera interpretación parece mucho más parsimoniosa, ya que en el caso segundo se rompería el clado Marginocephalia (=Pachycephalosauria+Ceratopsia), que debería formar, y el clado Heterodontosauriformes (=Heterodontosauridae+Marginocephalia) propuesto por Xu et al en 2006.

En la parte inferior a estas líneas, se muestra una reconstrucción de Yinlong downsi, otro Ceratopsia basal.

44 comentarios:

Fujur dijo...

Extraordinario! Pachicepalosáuridos y ceratópsidos por un lado, emparentados con los ornitópodos. Ahora bien, cuál es el parecido, antepasado común, con los estegosáuridos y los ankilosáuridos. Es curioso.

Gran post, para variar!
Te haces MUCHO de esperar! ;-)

William Buckland dijo...

En el caso de Thyreophora (Stegosauria+Ankylosauria), el miembro más primitivo es Scutellosaurus
, un simpático animalito coetáneo de Heterodontosaurus.
Y como antepasado común de todos los Ornithischia, de momento quedanmuy bien Leshotosaurus y Pisanosaurus.
El caso es que a mi también me parece curioso, porque además es como si el árbol genealógico de Ornithischia ya funcionase, parece que la idea de sus linajes y de su origen empieza a estar más clara y todos parecen venir de adaptaciones de Leshotosaurus y Pisanosaurus.

Saludos, e intentaré volver a publicar más a menudo, pero no puedo prometer nada.

Dinorider d'Andoandor dijo...

genial! esas formas transicionales me encantan

William Buckland dijo...

Y que lo digas, siempre resulta muy exótico ver a las condiciones ancestrales.


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