Concavenator - pierzasty karnozaur

Czyli co piszczy w paleontologicznej "trawie" :)
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Daniel Madzia
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Concavenator - pierzasty karnozaur

Post autor: Daniel Madzia »

:)

Obrazek
Ortega F., Escaso F. & Sanz J. L. 2010. A bizarre, humped Carcharodontosauria (Theropoda) from the Lower Cretaceous of Spain. Nature 467: 203–206.

Carcharodontosaurs were the largest predatory dinosaurs, and their early evolutionary history seems to be more intricate than was previously thought. Until recently, carcharodontosaurs were restricted to a group of large theropods inhabiting the Late Cretaceous Gondwanan land masses, but in the last few years Laurasian evidence has been causing a reevaluation of their initial diversification. Here we describe an almost complete and exquisitely preserved skeleton of a medium-sized (roughly six metres long) theropod from the Lower Cretaceous series (Barremian stage) Konservat-Lagerstätte of Las Hoyas in Cuenca, Spain. Cladistic analysis supports the idea that the new taxon *Concavenator corcovatus* is a primitive member of Carcharodontosauria, exhibiting two unusual features: elongation of the neurapophyses of two presacral vertebrae forming a pointed, hump-like structure and a series of small bumps on the ulna. We think that these bumps are homologous to quill knobs present on some modern birds; the knobs are related to the insertion area of follicular ligaments that anchor the roots of the flight feathers (remiges) to the arm. We propose that *Concavenator* has integumentary follicular structures inserted on the ulna, as in modern birds. Because scales do not have follicles, we consider the structures anchored to the *Concavenator* arms to be non-scale skin appendages homologous to the feathers of modern birds. If this is true, then the phylogenetic bracket for the presence of non-scale skin structures homologous to feathers in theropod dinosaurs would be extended to the Neotetanurae, enlarging the scope for explaining the origin of feathers in theropods.

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nazuul
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Re: Concavenator corcovatus gen. et sp. nov.

Post autor: nazuul »

WOW!!! Szczena opada!
Chyba sie zagadka Becklespinax wyjaśni [EDIT. Jednak nie]. Oczywiście rezerwuję opis.

EDIT
Czemu oni wywalają a priori taskony z analizy?!? Dziwi też tytuł pracy - nie ma nic o piórach, a to jest (IMHO) najważniejszy aspekt odkrycia.
Opis: viewtopic.php?f=6&t=3637
Zmieniłem nazwe tematu na bardziej sensacyjną :wink:
Obrazek
[Stamp: Apsaravis] [Avatar: P. Weimer, CC BY-NC-SA 2.0]

d_m

Re: Concavenator corcovatus gen. et sp. nov.

Post autor: d_m »

Niezły. Tylko czemu taki spiczasty wyrostek, a nie podłużny garb?

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