I want to know the answer to the following question:
Two important Amniotes  lineages became distinct, what was the name of that distinction?
All the background I'm provided with is that "They descended from earlier reptiliomorph amphibious tetrapods, which lived on land that was already inhabited by insects and other invertebrates as well as by ferns, mosses and other plants.". Is that enough to answer the question?
Answer: no