You will notice that some lineages (e. g. the descendants of species 56) branched many times and are represented by many living species. Discuss the ecological conditions that you think might result in the rapid diversification of some lineages. Use the caminalcules as examples. Think about what environmental conditions drove these particular caminalcules to evolve (A real world example would be the diversification of the mammals at the beginning of the Cenozoic, right after the dinosaurs went extinct.)

The environment selects the lineage which better fits their specializations in the available resources.

Explanation:

The possible motive that lineages demonstrated quickly diversification might happen because the environment contained the opportunities which the lineages took as an opportunity to evolve. The environment could have benefited some species rather than others which could lead to different specializations of different lineages. For example, after the downfall of the dominance of dinosaurs, mammals had a few new environments to evolve with new resources, this led to more lineage biodiversification.

most community's take hundreds of years to become stable

we would need to see the picture to answer it