Members of primitive groups interfused .

本初群组的成员是交错的。

youdao

We consider that the ANITA members belong to the primitive groups because of their many plesiomorphies.

指出ANITA的成员由于包含大量的 祖征，是属于原始的类群。

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However, such a problem is very difficult in general, even for primitive groups and it depends heavily on the understanding of abstract groups and the application of combinatorial tools as well.

然而，即使对于本原群，其次轨道的决定也是一个非常困难的问题，它依赖与人们对抽象群本身结构的了解和一些组合方法的应用。

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The creature's discovery has astounded scientists because their age puts them within two recognized groups of pterodactyls -- primitive long-tailed forms and advanced short-tail forms -- and they display characteristics of both.

CNN: Pterodactyl fossil fills gaps in evolutionary tale

The combination of features indicates that the primitive pterodactyls evolved relatively quickly, and that certain groups of features changed at the same time.

CNN: Pterodactyl fossil fills gaps in evolutionary tale