1.For the reasons of preserve situation and the difficulty of preparation, there are a lot of synonym and the nomen dubium in the published taxa.

由于化石的保存狀況以及標本的修理難度等多種原因，已經(jīng)發(fā)表的材料中包括了大量的同物異名現(xiàn)象以及無效的屬種。

2.For the reasons of preserve situation and the difficulty of preparation, there are a lot of synonym and the nomen dubium in the published taxa.

由于化石的保存狀況以及標本的修理難度等多種原因，已經(jīng)發(fā)表的材料中包括了大量的同物異名現(xiàn)象以及無效的屬種。