distribution permutation

The study of the protosepta number, the yielding position and fashion, the arranging system of Heterocorall septa is basic premise in discussing the origin, evolution and classification of Heterocorall.

异珊瑚原始隔壁数目、后生隔壁的增生部位和方式以及隔壁的排布系列的研究 ,是探讨异珊瑚的起源、演化和分类的基本前提。