A class of long-extinct marine invertebrates. Is a brachiopod hinge door with the key link. Hinge line straight, the base surface low. No carpal structure, with wrist marks, multi-plate without teeth. Hinge teeth, hinge fossa is not developed more. closed muscle scar evident, showing leaf-shaped, or dendritic. the main processes significantly, simple or complex. fake rash shell. shells decoration varied, both in the shell decorated with thorns. Late Ordovician beginning to emerge, to the Permian extinction.
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The Permian extinction—the worst extinction event in the planet\'s history—is estimated to have wiped out more than 90 percent of all marine species and 70 percent of land animals.
二叠纪的生命大灭绝，是我们这个星球上最可怕的一次物种灭绝，海洋的90%的生命以及陆地上70%的生命都消失了。
The end of the Permian period, 252m years ago, was marked by the biggest extinction of life known to have happened on Earth.
252百万年前的二叠纪晚期以已知的地球上发生过的最惨痛的生物灭绝事件著称。
The Permian extinction-the worst extinction event in the planet's history-is estimated to have wiped out more than 90 percent of all Marine species and 70 percent of land animals.
二叠纪的生命大灭绝，是我们这个星球上最可怕的一次物种灭绝，海洋的90%的生命以及陆地上70%的生命都消失了。
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