Both of these facts mean it is likely that some lineages which seem to make their first appearance in the extratropical fossil record actually started out near the equator.
Both of these facts mean it is likely that some lineages which seem to make their first appearance in the extratropical fossil record actually started out near the equator.
上述两种因素都表明某些世系虽最早出现在热带外区域的化石记录上，实际上却有可能起源于赤道附近。