美国发现新品种“大象腿”恐龙
文章来源:未知 文章作者:enread 发布时间:2011-02-24 01:10 字体: [ ]  进入论坛
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A new dinosaur1 named Brontomerus mcintoshi, or "thunder-thighs3" after its enormously(巨大地) powerful thigh2 muscles, has been discovered in Utah, USA. The new species is described in a paper recently published in the journal Acta Palaeontologica Polonica by an international team of scientists from the U.K. and the U.S. A member of the long-necked sauropod(蜥脚类动物) group of dinosaurs4 which includes Diplodocus and Brachiosaurus, Brontomerus may have used its powerful thighs as a weapon to kick predators5, or to help travel over rough, hilly terrain7(地形,地势) . Brontomerus lived about 110 million years ago, during the Early Cretaceous Period, and probably had to contend with fierce "raptors" such as Deinonychus and Utahraptor.

The fossilised bones of two specimens9 of Brontomerus mcintoshi – an adult and a juvenile10 – were rescued from a previously11 looted and damaged quarry12(采石场) in eastern Utah by researchers from the Sam Noble Museum. Paleontologists speculate that the larger specimen8 is the mother of the younger and would have weighed around 6 tons, about the size of a large elephant, and measured 14 meters in length. At a third of the size, the smaller specimen would have weighed about 200 kg, the size of a pony13, and been 4.5 m long.

The authors classified the new genus based on an incomplete skeleton including bones from the shoulder, hip14, ribs15, vertebrae(脊椎) and some unidentifiable fragments. They used the bones to identify Brontomerus' unique features, primarily the shape of the ilium (hip bone), which, in the case of Brontomerus, is unusually large in comparison to that of similar dinosaurs. The wide, blade-shaped bone projects forward ahead of the hip socket16, providing a proportionally massive area for the attachment17 of muscles.

The shape of the bone indicates that the animal would likely have had the largest leg muscles of any dinosaur in the sauropod family. This is reflected in the name Brontomerus, which literally18 means "thunder-thighs." The dinosaur's species name, mcintoshi, was chosen in honor of John "Jack19" McIntosh, a retired20 physicist21 at Wesleyan University, Conn., and lifelong avocational22 paleontologist.

"Brontomerus mcintoshi is a charismatic dinosaur and an exciting discovery for us," said first author Mike Taylor, a researcher in the Department of Earth Sciences at University College London. "When we recognised the weird23 shape of the hip, we wondered what its significance might be, but we concluded that kicking was the most likely. The kick would probably have been used when two males fought over a female, but given that the mechanics were all in place it would be bizarre if it wasn't also used in predator6 defense24."

Other marks on the bones give additional clues to Brontomerus' lifestyle and environment. Co author Matt Wedel, assistant professor of anatomy25(解剖学) at Western University of Health Sciences, Pomona, Calif., explained: "The shoulder blade of Brontomerus has unusual bumps that probably mark the boundaries of muscle attachments26, suggesting that Brontomerus had powerful forelimb muscles as well. It's possible that Brontomerus mcintoshi was more athletic27 than most other sauropods. It is well established that far from being swamp-bound hippo-like animals, sauropods preferred drier, upland areas; so perhaps Brontomerus lived in rough, hilly terrain and the powerful leg muscles were a sort of dinosaur four-wheel drive."

While Brontomerus' unusual hip structure and enormous thigh muscles place it on the list of most extreme dinosaurs, it is also a significant find for another reason. It is one more in a number of finds over the past 20 years that challenge the previously held idea that sauropods began to disappear in the Early Cretaceous period.

"Because sauropods were the most abundant dinosaurs found during the Jurassic period and the rarest during the Early Cretaceous, there's long been the perception that sauropods were successful in the Jurassic and were replaced by duckbills(鸭嘴兽) and horned dinosaurs in the Cretaceous," explained Wedel. "In the past 20 years, however, we are finding more sauropods from the Early Cretaceous period, and the picture is changing. It now seems that sauropods may have been every bit as diverse as they were during the Jurassic, but much less abundant and so much less likely to be found."



点击收听单词发音收听单词发音  

1 dinosaur xuSxp     
n.恐龙
参考例句:
  • Are you trying to tell me that David was attacked by a dinosaur?你是想要告诉我大卫被一支恐龙所攻击?
  • He stared at the faithful miniature of the dinosaur.他凝视著精确的恐龙缩小模型。
2 thigh RItzO     
n.大腿;股骨
参考例句:
  • He is suffering from a strained thigh muscle.他的大腿肌肉拉伤了,疼得很。
  • The thigh bone is connected to the hip bone.股骨连着髋骨。
3 thighs e4741ffc827755fcb63c8b296150ab4e     
n.股,大腿( thigh的名词复数 );食用的鸡(等的)腿
参考例句:
  • He's gone to London for skin grafts on his thighs. 他去伦敦做大腿植皮手术了。 来自《简明英汉词典》
  • The water came up to the fisherman's thighs. 水没到了渔夫的大腿。 来自《简明英汉词典》
4 dinosaurs 87f9c39b9e3f358174d58a584c2727b4     
n.恐龙( dinosaur的名词复数 );守旧落伍的人,过时落后的东西
参考例句:
  • The brontosaurus was one of the largest of all dinosaurs. 雷龙是所有恐龙中最大的一种。 来自《简明英汉词典》
  • Dinosaurs have been extinct for millions of years. 恐龙绝种已有几百万年了。 来自《简明英汉词典》
5 predators 48b965855934a5395e409c1112d94f63     
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
参考例句:
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
6 predator 11vza     
n.捕食其它动物的动物;捕食者
参考例句:
  • The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
  • Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴,它是一种令人恐惧的捕食性动物。
7 terrain sgeyk     
n.地面,地形,地图
参考例句:
  • He had made a detailed study of the terrain.他对地形作了缜密的研究。
  • He knows the terrain of this locality like the back of his hand.他对这一带的地形了如指掌。
8 specimen Xvtwm     
n.样本,标本
参考例句:
  • You'll need tweezers to hold up the specimen.你要用镊子来夹这标本。
  • This specimen is richly variegated in colour.这件标本上有很多颜色。
9 specimens 91fc365099a256001af897127174fcce     
n.样品( specimen的名词复数 );范例;(化验的)抽样;某种类型的人
参考例句:
  • Astronauts have brought back specimens of rock from the moon. 宇航员从月球带回了岩石标本。
  • The traveler brought back some specimens of the rocks from the mountains. 那位旅行者从山上带回了一些岩石标本。 来自《简明英汉词典》
10 juvenile OkEy2     
n.青少年,少年读物;adj.青少年的,幼稚的
参考例句:
  • For a grown man he acted in a very juvenile manner.身为成年人,他的行为举止显得十分幼稚。
  • Juvenile crime is increasing at a terrifying rate.青少年犯罪正在以惊人的速度增长。
11 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
12 quarry ASbzF     
n.采石场;v.采石;费力地找
参考例句:
  • Michelangelo obtained his marble from a quarry.米开朗基罗从采石场获得他的大理石。
  • This mountain was the site for a quarry.这座山曾经有一个采石场。
13 pony Au5yJ     
adj.小型的;n.小马
参考例句:
  • His father gave him a pony as a Christmas present.他父亲给了他一匹小马驹作为圣诞礼物。
  • They made him pony up the money he owed.他们逼他还债。
14 hip 1dOxX     
n.臀部,髋;屋脊
参考例句:
  • The thigh bone is connected to the hip bone.股骨连着髋骨。
  • The new coats blouse gracefully above the hip line.新外套在臀围线上优美地打着褶皱。
15 ribs 24fc137444401001077773555802b280     
n.肋骨( rib的名词复数 );(船或屋顶等的)肋拱;肋骨状的东西;(织物的)凸条花纹
参考例句:
  • He suffered cracked ribs and bruising. 他断了肋骨还有挫伤。
  • Make a small incision below the ribs. 在肋骨下方切开一个小口。
16 socket jw9wm     
n.窝,穴,孔,插座,插口
参考例句:
  • He put the electric plug into the socket.他把电插头插入插座。
  • The battery charger plugs into any mains socket.这个电池充电器可以插入任何类型的电源插座。
17 attachment POpy1     
n.附属物,附件;依恋;依附
参考例句:
  • She has a great attachment to her sister.她十分依恋她的姐姐。
  • She's on attachment to the Ministry of Defense.她现在隶属于国防部。
18 literally 28Wzv     
adv.照字面意义,逐字地;确实
参考例句:
  • He translated the passage literally.他逐字逐句地翻译这段文字。
  • Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
19 jack 53Hxp     
n.插座,千斤顶,男人;v.抬起,提醒,扛举;n.(Jake)杰克
参考例句:
  • I am looking for the headphone jack.我正在找寻头戴式耳机插孔。
  • He lifted the car with a jack to change the flat tyre.他用千斤顶把车顶起来换下瘪轮胎。
20 retired Njhzyv     
adj.隐退的,退休的,退役的
参考例句:
  • The old man retired to the country for rest.这位老人下乡休息去了。
  • Many retired people take up gardening as a hobby.许多退休的人都以从事园艺为嗜好。
21 physicist oNqx4     
n.物理学家,研究物理学的人
参考例句:
  • He is a physicist of the first rank.他是一流的物理学家。
  • The successful physicist never puts on airs.这位卓有成就的物理学家从不摆架子。
22 avocational 761d6332211abf964aef01a5194a019c     
adj.副业的,嗜好的
参考例句:
  • You might call it an avocational hazard. 你可以将之称为一心两用的危险。
  • As far as avocational hobby is concerned, Jennifer and her sister have almost nothing in common. 就业余爱好而言,珍妮和她妹妹几乎没有什么共同之处。
23 weird bghw8     
adj.古怪的,离奇的;怪诞的,神秘而可怕的
参考例句:
  • From his weird behaviour,he seems a bit of an oddity.从他不寻常的行为看来,他好像有点怪。
  • His weird clothes really gas me.他的怪衣裳简直笑死人。
24 defense AxbxB     
n.防御,保卫;[pl.]防务工事;辩护,答辩
参考例句:
  • The accused has the right to defense.被告人有权获得辩护。
  • The war has impacted the area with military and defense workers.战争使那个地区挤满了军队和防御工程人员。
25 anatomy Cwgzh     
n.解剖学,解剖;功能,结构,组织
参考例句:
  • He found out a great deal about the anatomy of animals.在动物解剖学方面,他有过许多发现。
  • The hurricane's anatomy was powerful and complex.对飓风的剖析是一项庞大而复杂的工作。
26 attachments da2fd5324f611f2b1d8b4fef9ae3179e     
n.(用电子邮件发送的)附件( attachment的名词复数 );附着;连接;附属物
参考例句:
  • The vacuum cleaner has four different attachments. 吸尘器有四个不同的附件。
  • It's an electric drill with a range of different attachments. 这是一个带有各种配件的电钻。
27 athletic sOPy8     
adj.擅长运动的,强健的;活跃的,体格健壮的
参考例句:
  • This area has been marked off for athletic practice.这块地方被划出来供体育训练之用。
  • He is an athletic star.他是一个运动明星。
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