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fossilshk (Lung)
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[廣告]:

Tiniest Dinosaur in North America Found

科學家證實發現最細小恐龍

October 21, 2009—The tiniest dinosaur in North America weighed less than a teacup Chihuahua, a new study says.

Seen above as an artist's reconstruction in front of a Tyrannosaurus rex skull at the Natural History Museum of Los Angeles County in California, the agile Fruitadens haagarorum was just 28 inches (70 centimeters) long and weighed less than two pounds (one kilogram).

The diminutive dinosaur likely darted among the legs of larger plant-eaters such as Brachiosaurus and predators such as Allosaurus about 150 million years ago, during the late Jurassic period.

Parts of the skulls, vertebrae, arms, and legs from four F. haagarorum specimens were found in the 1970s in Colorado and later stored at the Natural History Museum.

A recent analysis of the fossil leg bones showed not only that the dinosaur is a new species but that the largest of the specimens are full-grown adults.

The discovery knocks Albertonykus borealis, a chicken-size dinosaur identified in 2008, off its pedestal as the tiniest North American dinosaur.

(Related: "Smallest Meat-Eating Dinosaur in N. America Discovered.")

The newfound dinosaur also had an unusual combination of teeth for a reptile: canine-like teeth in the front of its jaws and molar-shaped teeth along its cheeks, according to the October 21 study, which appears in the journal Proceedings of the Royal Society B.

This arrangement and the creature's small stature mean it's likely that F. haagarorum ate plants, eggs, and insects.

The tiny dinosaur was found in Colorado's fossil-rich Fruita Paleontological Area. To find such an unexpected species in a well-studied area suggests it's "still possible to discover completely unique and remarkable [fossil] species," study leader Richard Butler, of the Bavarian State Collection for Paleontology in Munich, Germany, said in a statement.

"If dinosaur ecosystems were that diverse, who knows what astonishing beasts are waiting for us to discover?"
http://news.nationalgeographic.c ... merica-picture.html

2009-10-22 04:45 AM

unknown12
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[廣告]:

really small......

2009-10-22 08:42 PM

unknown12
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[廣告]:

加州博物館展出北美洲發現體型最小恐龍化石

美國加州一間博物館，展出在北美洲找到體型最小的恐龍化石，身長只有約七十厘米。研究人員相信這個品種在地球上生存了一億年。

博物館首次向外界展示迷你恐龍「果齒龍」復原模型。這種恐龍身長只有約七十厘米，高十多厘米，體重不足一公斤，重量與一隻普通的天竺鼠差不多，是現時在北美發現體型最細小的恐龍化石。牠的下顎前方和兩旁，分別有犬齒狀和葉狀的牙齒，相信牠是雜食性恐龍，在類似品種當中相當罕見。

七十年代，專家在美國科羅拉多州西部發現果齒龍化石，最近才被館方研究人員鑑定為新恐龍品種。研究人員，指果齒龍出現在一億五千萬年前侏羅紀晚期，與一些大型肉食恐龍一起生活，體型細小而且身手敏捷，能夠獲得更多生存空間。這種品種在地球上生存了約一億年。

2009-10-22 08:49 PM

leo2004
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[廣告]:

北美最細恐龍僅10厘米高

北美最細恐龍僅10厘米高

【本報訊】一般人印象中恐龍都是龐然大物，但美國洛杉磯博物館近日卻展出一批站起來只有十厘米高的恐龍化石標本及模型，這是目前所知北美洲最小的恐龍。
不到900克身長60厘米

洛杉磯國家歷史博物館恐龍館總監夏普稱，這種迷你恐龍在生時重量少於九百克，站立時高約十厘米，由頭至尾身長六十厘米，相信外形有點像走鵑鳥。這種生活在約一億五千萬年前侏羅紀晚期的迷你恐龍，相信是以植物及昆蟲為食糧。由於牠們身形細小又跑得快，所以可以在巨大恐龍的腿腳之間穿插，避開攻擊。

這批迷你恐龍化石共有四副，它們是大約三十年前在科羅拉多西部發現並收入博物館，參與研究的夏普及專家最近將這個品種的迷你恐龍取名為「Fruitadens haagarorum」。

http://orientaldaily.on.cc/cnt/c ... 1023/00180_021.html

2009-10-23 01:31 PM

oviraptor (偷蛋龍)
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[廣告]:

Thank you for all.

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2009-10-25 04:02 AM

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