史前怪獸探秘
所屬欄目：科學世界
所屬頻道：CCTV-10科教
年份：2010
展開全部
簡介：就在古食肉類不斷發展的同時，從古新世的一種古食肉類--古貓獸類當中，分化出了一支進步的類型，它們的裂齒由第四上前臼齒和第一下臼齒組成。從此，一種新型的食肉動物--食肉目哺乳動物出現了。這種前移的裂齒構造使撕裂肉食的工作更有效率，再加上其它一系列進步的體制結構，食肉目哺乳動物開始發展起來，當大多數古食肉類在始新世末滅絕以後，它們從漸新世開始完全取代了古食肉類的地位。古食肉類中只有鬣齒獸類一支延續到上新世早期。收起
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