Extended Data Fig. 8: Serial homology and morphological gradient as illustrated by the dentitions of Feredocodon.

The most common structures in the dentitions are the paracone (cusp A) in the upper dentition and the protoconid (cusp a) in the lower; they are the earliest formed in development and most primitive in evolution. The least common structures are the pseudoprotocone and cusp g, which are the latest formed cusps in development and most derived in evolution. Yellow dots indicate initial condition of the feature in teeth. Green dots indicate occurences of structures in corresponding teeth. Dark green indicates the parastyle, homologous with cusp B³⁰. The empty circle indicates lack of cusp B (present in the left P4 of IMMNH-009166), probably a “development noise”⁸⁰.