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'naga'
Pterosaurus ompong mendominasi langit Cretaceous akhir
Sebuah studi
baru memberikan wawasan menarik keragaman dan distribusi Pterosaurus dari
keluarga Azhdarchidae. Mendominasi langit Cretaceous akhir kelompok
"Naga" terbang ompong mewakili link penting dalam evolusi transisi antara
zaman pra-sejarah dan dunia seperti yang kita kenal sekarang......
Toothless 'dragon' pterosaurs dominated the Late Cretaceous skies
Date:
August 18,
2014
Source:
Pensoft Publishers
Summary:
A new study provides an exciting
insight into the diversity and distribution of pterosaurs from the Azhdarchidae
family. Dominating the Late Cretaceous skies this group of toothless flying
'dragons' represent an important link in evolutionary transitions between the
pre-historic times and the world as we know it today.
............................
A new study provides an exciting insight into the Late
Cretaceous and the diversity and distribution of the toothless 'dragon'
pterosaurs from the Azhdarchidae family. The research was published in the open
access journal ZooKeys.
The
Azhdarchidan pterosaurs derive their name from the Persian word for dragon --
Aždarha. Interestingly, this derived and rather successful group of pterosaurs
included some of the largest known flying animals of all times, with a wingspan
reaching between 10 and 12 m.
'Dragon'
pterosaurs had a worldwide distribution once and were the last of their kind to
survive on the planet, until some 60 mya. They dominated the skies during the
Late Cretaceus and unlike their predecessors, were characteristically
toothless.
"This
shift in dominance from toothed to toothless pterodactyloids apparently
reflects some fundamental changes in Cretaceous ecosystems, which we still
poorly understand," comments the author of the study Dr Alexander
Averianov, Zoological Institute of the Russian Academy of Sciences.
Generally
fossil record of pterosaurs is patchy and confined mostly to sedimentary
deposits known as Konservat-Lagerstätten where exceptional depositional
conditions facilitated preservation of fragile pterosaur bones. Unfortunately,
such Lagerstätten are very rare for the Late Cretaceous when most of the
evolutionary history of Azhdarchidae took place, which makes these exciting
creatures exceptionally hard to study.
"Azhdarchidae
currently represent a real nightmare for paleontologists: most taxa are known
from few fragmentary bones, which often do not overlap between named taxa, the
few articulated skeletons are poorly preserved, and some of the best available
material has remained undescribed for forty years." explains Dr Averianov
about the difficulties studying the group.
Despite
these difficulties, the number of localities were azhdarchidan pterosaurs were
found is impressive and undoubtedly reflect the important role they played in
the Cretaceous ecosystems. These flying giants likely inhabited a large variety
of environments, but seem to have been abundant near large lakes and rivers and
most common in nearshore marine environments.
Story
Source:
The above
story is based on materials provided by Pensoft Publishers. The original story is licensed
under a Creative Commons License. Note: Materials may be edited
for content and length.
Journal
Reference:
- Alexander Averianov. Review of taxonomy, geographic distribution, and paleoenvironments of Azhdarchidae (Pterosauria). ZooKeys, 2014; 432: 1 DOI: 10.3897/zookeys.432.7913
