Scientists found in Shaanxi, China's earliest human ancestor fossil microscopic detail alarming | scientists | _ news

Our most ancient ancestors look like? Recently scientists found fossils of Shaanxi Province in China will uncover the mystery. However, both should not be linked to the shape. Scientists say the image resembles the alien, only mm bags the size of marine life are our ancestors.

> Scientists fossil map diagram

According to the United Kingdom Broadcasting Corporation (BBC) reported on January 31, by the United Kingdom, China and Germany, an international research group consisting of scientists study published in the journal nature reported that so far they found traces of the oldest known human ancestor.

Scientists said they were in China's Shaanxi Province, found the fossils, well-preserved fossil.

The scientists also said the tiny marine animals living in 450 million years ago, is the earliest known through evolutionary way into fish, and eventually evolved into the human creature. Saccorhytus the size of only about 1 mm, believed to be living under the sea bed between the grains of sand.

Research team said, this animal called the Saccorhytus is called "deuterostome" (deuterostomes) one of the original members in this category, while "animal after" includes "vertebrates" (vertebrates), the common ancestor of many species. (The observer network Note: the deuterostome gastrula embryos in its original form as the anus and mouth formed part of the contrast of animals collectively).

>Saccorhytus with a thin layer of the relative flexibility of the muscles and skin

Scientists have not found any evidence of this kind of animal is the anus, this show after they digest food with an outlet drain.

In participating in this study of the United Kingdom, China, and Germany among scientists, among them Morris, a professor at the University of Cambridge (Simon Conway Morris).

Prof Morris said to the BBC, if with the naked eye to see these fossils is that some black sand, but the microscope observations showed the shocking details.

He said, "I think, as an early opening of the animals, the animal represents the primitive beginnings of many species, including our own. After all the animals have a common ancestor, we believe that this is where we are now available. ”

Shu Degan, a professor at Northwestern University in Xian, China, "said Saccorhytus as we know from the mouth of the animals to the fish, and eventually to the earliest stages of human evolution, provided very important information. ”

Before that, scientists discovered "deuterostome" earliest dated to 510 million to 520 million years ago, when the animals have begun to differentiate into human ancestors belong to vertebrates and starfish and sea urchins such animals.

However, the scientist it is difficult to determine what is the common ancestors of these animals.

New research suggests that the common ancestors of the body is symmetrical, which is common in many species, including humans inherited characteristics.

Saccorhytus has a thin skin, with supple skin and muscle, researchers say, it is by Contracting muscles move.

Scientists say Saccorhytus's most striking characteristic is its obvious big mouths relative to the body. Scientists believe this may be because it needs to swallow food particles or other organisms.

There are 10 interesting, is that it's a conical structure. Scientists believe that this is in order to let it swallow the water outflow from here, this may be the prototype of the gills.

> Editors: Dong Zhang

Article keywords:
Scientists of human

I want feedback
Save a Web page
Observer network

中国科学家在陕西发现最早人类祖先化石 显微镜下细节令人震惊|科学家|人类_新闻资讯

　　人类最古老的祖先长什么样？最近科学家在中国陕西发现的化石将揭开这个谜团。不过，先不要将两者的外形联系起来。科学家称，这个形象酷似像外星人，只有毫米大小的袋状海洋生物就是我们的祖先。

>科学家根据化石绘制的示意图

　　据英国广播公司（BBC）1月31日报道，由英国、中国和德国科学家组成的一个国际研究小组在《自然》杂志发表研究报告说，他们发现了迄今所知的最古老的人类祖先的痕迹。

　　科学家说，他们是在中国的陕西省发现这些化石的，化石保存完好。

　　这些科学家还说，这个微小的海洋动物生活在距今4.5亿年前，是已知最早的通过进化途径转变为鱼，再最终进化成人类的生物。Saccorhytus的尺寸只有大约1毫米，据信生活在海床下的沙粒之间。

　　研究小组说，这个被称为Saccorhytus的动物是所谓“后口动物”（deuterostomes）这个种类中的最原始的一个成员，而“后口动物”是包括“脊椎动物”（vertebrates）在内的许多物种的共同祖先。（观察者网注： 后口动物指在胚胎的原肠胚期其原口形成为肛门而与之相对的后口形成嘴部的动物总称）。

>Saccorhytus有一层薄薄的相对柔韧的肌肉和皮肤

　　科学家没有找到任何这种动物有肛门的证据，这显示他们在消化食物后用同一个出口排泄。

　　在参加这项研究的英国、中国和德国科学家之中，其中有英国剑桥大学教授的莫里斯（Simon Conway Morris）。

　　莫里斯教授对BBC说，如果用肉眼看这些化石，就是一些黑色的沙粒，但是显微镜观察所显示的细节令人震惊。

　　他说，“我认为，作为早期的后口动物，这种动物代表着很多物种的原始的开端，其中包括我们自己。所有的后口动物都有一个共同的祖先，我们认为就是我们现在找到的这个。”

　　中国西安西北大学教授舒德干说，“Saccorhytus为我们了解从后口动物到鱼，最终到人类的进化过程的最初阶段，提供了非常重要的信息。”

　　在此之前，科学家所发现的“后口动物”最早的生活年代为5.1亿到5.2亿年前，这时的动物已经开始分化为人类祖先所属的脊椎动物和海星与海胆这类动物。

　　但是，科学家很难确定上述这些动物的共同祖先是什么样的。

　　最新研究显示，这个共同祖先的身体是对称的，这也是包括人类在内的许多物种继承下来的共同特征。

　　Saccorhytus有一层薄薄的皮肤，有着相对柔韧的皮肤以及肌肉，研究人员认为，它是靠通过收缩肌肉移动的。

　　科学家说，Saccorhytus最醒目的特征是它相对于身体的明显很大的大嘴。科学家认为，这可能是因为它需要吞食食物颗粒或其他生物。

　　还有一点十分有趣，那就是它身上的一个圆锥形构造。科学家认为，这是为了让它吞下的水从这里流出，这可能是鱼鳃的雏形。

>责任编辑：张冬

文章关键词：
科学家 人类

我要反馈
保存网页
观察者网