约 2 个结果
在新选项卡中打开链接
Symplesiomorphy - Encyclopedia.com
2018年5月8日 · Because of their ancient origin, symplesiomorphies are not usually helpful in assessing more recent evolutionary relationships within a larger group. For example, the …
Biology: Classification Systems - Encyclopedia.com
Several novel approaches to taxonomy emerged in the twentieth century. The most influential was cla-distics, devised by the German zoologist Willi Hennig (1913–1976). Hennig further refined …