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The evolution of the placenta in poeciliid fishes
Highlights • Placentation has evolved multiple times in the live-bearing fish family Poeciliidae • We find no consistent family-wide associations between placentation and habitat • Placental species tend to have superfetation and reduced reproductive allotment • Placental species tend to have either few large offspring or many small offspring Summary How and why complex organs evolve is generally lost to history.
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