Extended Data Fig. 3: Evolutionary shifts in sperm length across Annelida.
From: Fertilization mode drives sperm length evolution across the animal tree of life
The two adaptive shifts detected in the evolutionary optima (θ), and their location are presented as green (positive shift in sperm length). The size of the circle represents the magnitude of the shift (but is multiplied by 10 for visibility in this group). External fertilizers (blue), internal fertilizers (red), and spermcasters (purple) are depicted at terminal branches of the phylogeny.
