26 Jan 2012

dinosaur bersayap Archaeopteryx burung pertama di dunia berbulu hitam

PARIS - Archaeopteryx yang merupakan seekor dinosaur bersayap dan dipercayai sebagai burung pertama di dunia mempunyai bulu berwarna hitam, menurut satu kajian saintifik yang dilaporkan kelmarin.

Para penyelidik di Amerika Syarikat dan Eropah mengkaji sehelai bulu sayap yang dipulihara pada satu fosil Archaeopteryx yang ditemui dalam kuari batu kapur Jerman pada 1861.

Penemuan itu diperoleh menerusi satu imbasan mikroskop elektron di makmal Carl Zeiss di Jerman.

GAMBAR menunjukkan spesimen fosil sayap dinosaur Archaeopteryx.

"Kami pada akhirnya menemui kunci warna asal bulu tersebut yang tersembunyi di dalam batu selama 150 juta tahun lalu," kata seorang biologi evolusi Universiti Brown di Rhode Island, AS. - AFP

Sumber asal: Kosmo! Online

Info tambahan:

Archaeopteryx (meaning "ancient wing") is a very early prehistoric bird, dating from about 150 million years ago during the Jurassic period, when many dinosaurs lived. It is one of the oldest-known birds.

Archaeopteryx seemed to be part bird and part dinosaur. Unlike modern-day birds, it had teeth, three claws on each wing, a flat sternum (breastbone), belly ribs (gastralia), and a long, bony tail. Like modern-day birds, it had feathers, a lightly-built body with hollow bones, a wishbone (furcula) and reduced fingers. This crow-sized animal may have been able to fly, but not very far and not very well. Although it had feathers and could fly, it had similarities to dinosaurs, including its teeth, skull, lack of a horny bill, and certain bone structures. Archaeopteryx had a wingspan of about 1.5 feet (0.5 m) and was about 1 foot ( 30 cm) long from beak to tail. It probably weighed from 11 to 18 ounces (300 to 500 grams).

Source: Dinosaur and Paleontology Dictionary

Archaeopteryx lithographica ("ancient wing from the printing stone").

Named after the limestone in which it was discovered. The stone is a smooth, fine grained limestone which was used in printing. Quarried from in and around the Solnhofen area of Germany.

Formed on the bottom of a hypersaline lagoon in the Late Jurassic, about 150 million years ago.
There have been 8 specimens of Archaeopteryx found (7 actual specimens and one feather).

Source: All About Archaeopteryx

simieY: apa la biologist ni, jumpa sehelai sayap binatang purba terus dinamakan "burung pertama dunia". bagi simieY, masih terlalu awal..baca seterusnya bawah ni

Source: nature - Internaional weekly journal of science

Analysis of fossil traits suggests that Archaeopteryx is not a bird at all. The latest discovery of a fossil that treads the line between birds and non-avian dinosaurs is leading palaeontologists to reassess the creature that has been considered the evolutionary link between the two.

The discovery of Xiaotingia zhengi has knocked Archaeopteryx off its perch as the first bird.

Archaeopteryx has long been placed at the base of the bird evolutionary tree. It has traits that have helped to define what it is to be a bird, such as long and robust forelimbs. Yet in recent years, the discoveries of numerous small, feathery dinosaurs have created a conundrum for palaeontologists, raising questions about which animals are the ancestors of modern birds and which are just closely related cousins.

Artist’s impression of Xiaotingia zhengi.

Baca selanjutnya di sini: Archaeopteryx no longer first bird


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