Archives de 26 juin 2008

Ventastega curonica and the origin of tetrapod morphology

Ventastega curonica and the origin of tetrapod morphology

Per E. Ahlberg, Jennifer A. Clack, Ervns Lukevis, Henning Blom & Ivars Zupi

Nature 453, 1199-1204 (26 June 2008) | doi:10.1038/nature06991; Received 22 November 2007; Accepted 9 April 2008

The gap in our understanding of the evolutionary transition from fish to tetrapod is beginning to close thanks to the discovery of new intermediate forms such as Tiktaalik roseae. Here we narrow it further by presenting the skull, exceptionally preserved braincase, shoulder girdle and partial pelvis of Ventastega curonica from the Late Devonian of Latvia, a transitional intermediate form between the ‘elpistostegids’ Panderichthys and Tiktaalik and the Devonian tetrapods (limbed vertebrates) Acanthostega and Ichthyostega. Ventastega is the most primitive Devonian tetrapod represented by extensive remains, and casts light on a part of the phylogeny otherwise only represented by fragmentary taxa: it illuminates the origin of principal tetrapod structures and the extent of morphological diversity among the transitional forms.

D’un coup d’un seul 🙂 😀 😀

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attention, polémique inside

Tom a publié un nouveau post avec la mention « attention, polémique potentielle inside ». Il a parfaitement raison; j’ai ôté l’adjectif superflu et je m’y lance donc.

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