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標題: 最新研究 棘龍在水中活動 [打印本頁]

作者: fossilshk    時間: 2014-9-12 09:14 AM     標題: 最新研究 棘龍在水中活動



專家觀乎其短腿、長腳掌、及大而平的爪,推測其腳掌有蹼。 其牙齒亦不像一般陸地獵食者般鋒利,反而呈圓錐形,更適合用以刺穿身體柔軟的生物,例如魚。

作者: fossilshk    時間: 2014-9-12 09:27 AM     標題: Giant Spinosaurus Was The First Dinosaur Known to Swim

The biggest and the baddest among meat-eating dinosaurs, Spinosaurus may have also been the first dinosaur to take to the water, swimming in North Africa's rivers some 97 million years ago, researchers reported on Thursday.

Floating like a crocodile to stalk prey, the 50-foot-long (15.2 meters) predator bore a massive sail on its back that would have risen from the water like a shark's fin. The carnivore probably ate fish, ancient crocodiles, and anything else afloat.

"It was the biggest carnivorous dinosaur, but Spinosaurus wasn't a land animal," says University of Chicago paleontologist Nizar Ibrahim, a National Geographic Society Emerging Explorer and lead author of the new report. "This was a creature adapted to life in the water."

Up to then, dinosaurs had ruled only the land. After 150 million years of dinosaur evolution, "suddenly we see these adaptations in Spinosaurus where it is able to swim," says University of Chicago paleontologist Paul Sereno, a co-author of Thursday's report in the journal Science describing new fossils that reveal how the fearsome ancient predator lived. (Read "Mr. Big" in National Geographic magazine.)

The fossil bones of Spinosaurus aegyptiacus described in the study turned up in sandstone beds in the Moroccan Sahara. Complete with skull, claws, and bones that formed the sail on its back, the fossils reveal a crocodilian snout, paddle-like feet, and dense bones that aided buoyancy, adding up to a life aquatic for the giant predator.

"All in all, the discoveries by this team show that Spinosaurus is an extremely unusual and specialized carnivorous dinosaur," says dinosaur expert Thomas Holtz of the University of Maryland in College Park, who was not part of the discovery team.

The fossil finds are also featured in the October National Geographic magazine, and will appear in a National Geographic/NOVA special on PBS in November.

"Spinosaurus has almost no 'junk in the trunk,'" Holtz says, noting its narrow hips and short thighs. "This doesn't make much sense for a land animal that makes a living chasing other land animals. But if it is an animal that doesn't spend most of its time on land, but instead in the water, it doesn't need strong leg muscles."

http://news.nationalgeographic.c ... y-dinosaur-science/

作者: oviraptor    時間: 2014-9-12 04:56 PM

作者: c7    時間: 2014-9-12 07:05 PM


[ 本帖最後由 c7 於 2014-9-12 07:07 PM 編輯 ]
作者: stonecold    時間: 2014-9-13 12:54 AM

原帖由 fossilshk 於 2014-9-12 09:14 AM 發表

最新研究發現,活躍於9千7百萬年前的白堊紀非洲的肉食性恐龍、� ...
Beautiful pictures!
作者: dragonfly    時間: 2014-9-15 03:09 AM

作者: c7    時間: 2014-9-15 08:45 PM


[ 本帖最後由 c7 於 2014-9-15 08:46 PM 編輯 ]
作者: trump    時間: 2014-9-19 01:19 AM

作者: oviraptor    時間: 2014-9-24 10:06 PM

原帖由 c7 於 2014-9-15 08:45 PM 發表
我相信佢會游水,但唔覺得龐大身軀可以於水中好敏捷甘去捉魚食,就算捉到魚,都不足夠佢食,就算水中霸王巨齒鯊,都可能因為未能滿足其食量而 ...
作者: unknown12    時間: 2014-10-1 12:04 PM

作者: dragonfly    時間: 2014-10-6 06:41 PM

原帖由 unknown12 於 2014-10-1 12:04 PM 發表
剛剛看了這個研究的journal,其實佢係用semi-aquatic尼形容棘龍,只不過說明棘龍係有能力(有適當身體結構,與現生水生/半水生生物比較)在水中活動� ...
Aggree with u!
作者: dinoman626    時間: 2015-7-5 06:00 PM     標題: 回復 #5 stonecold 的帖子

我都有買呢期national geographic,講棘龍
作者: c7    時間: 2015-7-15 09:37 AM

原帖由 dinoman626 於 2015-7-5 06:00 PM 發表
我都有買呢期national geographic,講棘龍
作者: adam    時間: 2015-9-7 05:34 PM

作者: 恐龍化身DIO    時間: 2016-8-27 02:03 PM

作者: fossilshk    時間: 2016-10-13 04:33 AM

原帖由 恐龍化身DIO 於 2016-8-27 02:03 PM 發表

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