三角恐龙家族鼻角的进化史
文章来源:未知 文章作者:enread 发布时间:2015-07-09 07:35 字体: [ ]  进入论坛
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Scientists have discovered Wendiceratops pinhornensis, a new species of horned dinosaur1 based on fossils collected from a bone bed in southern Alberta, Canada, according to a study published July 8, 2015 in the open-access journal PLOS ONE by co-authors David Evans from the Royal Ontario Museum and Michael Ryan from Cleveland Museum of Natural History. The new dinosaur, named Wendiceratops pinhornensis, is described from over 200 bones representing the remains2 of at least four individuals, three adults and one juvenile3, collected from a bonebed in southern Alberta, Canada. Wendiceratops pinhornensis was approximately 20 feet long and weighed more than a ton. It lived about 79 million years ago, making it one of the oldest known members of the family of large-bodied horned dinosaurs4 that includes the famous Triceratops, the Ceratopsidae.
 
A series of forward-curling hook-like horns adorn5 the margin6 of the wide, shield-like frill that projects from the back of the Wendiceratop skull7, considered elaborate by the authors for an early member of the horned dinosaur family. The nasal bone, although represented by fragmentary specimens8, likely supported a prominent, upright nasal horn. This may represent the earliest documented occurrence of a tall nose horn in Ceratopsia, possibly shedding light on nose horn evolution in the horned dinosaur family. The addition of Wendiceratops adds to a growing body of research which suggests high diversity of ceratopsids likely associated with a rapid evolutionary9 radiation in the group. 
 
"Wendiceratops helps us understand the early evolution of skull ornamentation in an iconic group of dinosaurs characterized by their horned faces." said co-author Dr. David Evans. "The wide frill of Wendiceratops is ringed by numerous curled horns, the nose had a large, upright horn, and it's likely there were horns over the eyes too. The number of gnarly frill projections10 and horns makes it one of the most striking horned dinosaurs ever found."
 
The name Wendiceratops means "Wendy's horned-face", and celebrates renowned11 Alberta fossil hunter Wendy Sloboda, who discovered the site in 2010.


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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 remains 1kMzTy     
n.剩余物,残留物;遗体,遗迹
参考例句:
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
3 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。
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 adorn PydzZ     
vt.使美化,装饰
参考例句:
  • She loved to adorn herself with finery.她喜欢穿戴华丽的服饰。
  • His watercolour designs adorn a wide range of books.他的水彩设计使许多图书大为生色。
6 margin 67Mzp     
n.页边空白;差额;余地,余裕;边,边缘
参考例句:
  • We allowed a margin of 20 minutes in catching the train.我们有20分钟的余地赶火车。
  • The village is situated at the margin of a forest.村子位于森林的边缘。
7 skull CETyO     
n.头骨;颅骨
参考例句:
  • The skull bones fuse between the ages of fifteen and twenty-five.头骨在15至25岁之间长合。
  • He fell out of the window and cracked his skull.他从窗子摔了出去,跌裂了颅骨。
8 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》
9 evolutionary Ctqz7m     
adj.进化的;演化的,演变的;[生]进化论的
参考例句:
  • Life has its own evolutionary process.生命有其自身的进化过程。
  • These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
10 projections 7275a1e8ba6325ecfc03ebb61a4b9192     
预测( projection的名词复数 ); 投影; 投掷; 突起物
参考例句:
  • Their sales projections are a total thumbsuck. 他们的销售量预测纯属估计。
  • The council has revised its projections of funding requirements upwards. 地方议会调高了对资金需求的预测。
11 renowned okSzVe     
adj.著名的,有名望的,声誉鹊起的
参考例句:
  • He is one of the world's renowned writers.他是世界上知名的作家之一。
  • She is renowned for her advocacy of human rights.她以提倡人权而闻名。
TAG标签: evolution dinosaur horns
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