For example, Peter Sheldon' s studies of trilobites, a now extinct marine animal with a segmented body, offer a detailed glimpse into three million years of evolution in one marine environment.
例如，彼得·谢尔登对于三叶虫的研究，那是一种已灭绝的身体分节的海洋生物，他的研究让我们得以一窥三百万年以来一个海洋环境的进化过程。
Some palaeontologists think them members of a phylum that is now extinct.
有的古生物学家认为它们属于已经绝迹的一门动物。
Fossils suggest that some earlier groups of plants, now extinct, had evolved a dependency on insects like scorpionflies.
化石显示，某些现已灭绝了的更早期的植物，也进化到了依靠蝎蛉授粉的阶段。
Although some of these animals were ancestors of kinds living today, others are now extinct, that is, they have no descendants alive now.
虽然这些动物中有一些是现今活着的各种动物的祖先，但是另一些动物现在已经灭绝了，即他们现在已经没有活着的后代了。
Many animals that lived thousands of years ago are now extinct.
许多生活在数千年前的动物现已绝种。
The Turkoman horse, or Turkmene, was an Oriental horse breed from the steppes of Central Asia, now extinct.
土库曼马，或Turkmene，是一个从中亚草原的东方马品种，现在已经灭绝。
However, these dogs weren't as good as the cats at this technique - and all the canid species who used it are now extinct.
然而，这些犬类动物并不像猫科动物那样擅长这项技能——所有曾使用这项技能的犬科动物现在都已经灭绝了。
Archeological finds in the Olduvai Gorge include stone tools, and skeletal remains of Homo Habilis and Homo Erectus, as well as bones of, now extinct, wild animals.
考古学家在奥杜瓦伊山谷发现了包括石器，能人和直立人骨架的遗骸，还有现已灭绝的野生动物遗骨在内的多个遗迹。
Or now-extinct living systems could have produced the methane long ago, with it only now being released through pores or fissures created by seasonal temperature variations.
或者目前已经灭绝的生物体系在很早以前产生了甲烷，只是现在通过孔或者裂缝释放出来，这些孔和裂缝则是由于温度的季节变化导致的。
For scorpionflies serving as pollinators for now-extinct groups of plants, see Ren, D. et al. 2009.
至于褐蛉对现已灭绝植物的授粉职能，见Ren,D. et al.
For scorpionflies serving as pollinators for now-extinct groups of plants, see Ren, D. et al. 2009.
至于褐蛉对现已灭绝植物的授粉职能，见Ren,D. et al.
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