The phrase "evolutionary lineage" refers to a sequence of species that are connected through a common ancestry, with each species giving rise to the next in a continuous series of changes and adaptations over time. Full definition
``... Our experimental approach contributes biological data challenging the broadly popularized paradigm that ecosystem turnovers associated with mass extinctions result from kill mechanisms [catastrophic mortality for organisms]-- rather than termination of evolutionary lineages. (ecoshock.org)
This analysis showed that while Tibetan brown bears share a close common ancestry with their North American and Eurasian kin, Himalayan brown bears belong to a distinct evolutionary lineage that diverged early on from all other brown bears. (sciencedaily.com)
Current Predictions of Approximate Gene Number and Genome Size in Organisms in Different Evolutionary Lineages. (fruitfly.org)