Surviving ancestors, hard polytomies, and seed plant evolution.
Renner SS, Grimm G, Sokoloff DD
Evolutionary History
Every seed plant you eat, grow, or walk past — from oaks to wheat to roses — belongs to a family tree scientists have been unable to draw for 40 years, and cracking this puzzle could reshape how we classify, breed, and conserve these plants.
Scientists have long struggled to draw an accurate family tree for seed plants, which include nearly every plant we see around us. The problem, this study suggests, is that some very ancient plant lineages never went extinct — they are still alive today — and standard branching-tree diagrams simply cannot show that. By proposing two new types of charts, researchers found a way to represent these 'surviving ancestors' and hope to finally untangle the deep evolutionary history of almost all plants on Earth.
Key Findings
Forty years of phylogenetic analysis have failed to resolve the evolutionary relationships among the five major groups of living seed plants
Surviving ancestors — ancient lineages that gave rise to descendants without going extinct — produce 'hard polytomies' (multiple simultaneous branches) that standard cladogram methods cannot accurately represent
Simulated ancestor experiments confirmed that network visualization tools can detect the signature of surviving ancestors in morphological data matrices, pointing toward a methodological path forward
chevron_right Technical Summary
Scientists have failed for 40 years to determine how the major groups of seed plants are related to one another. This study argues that 'surviving ancestors' — ancient lineages still alive today — are causing the confusion, and proposes two new diagram types to break the longstanding evolutionary deadlock.
Abstract Preview
Forty years of phylogenetic analysis have failed to resolve the relationships among the major groups of seed plants. From the fossil record it is clear that more seed plant groups have gone extinct...
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