Fig 8. Origin and evolution of the bilophodont pattern in paenungulates: a new structural scenario for upper molars including the stem taxa Ocepeia and Abdounodus which documents two intermediate stages between the tribosphenic-tritubercular pattern and the quadritubercular-bilophodont pattern.

Photography and occlusal sketch of teeth, all figured as right teeth. Symbols of dental structures: Black circles: paracone and metacone, green circle: metaconule; red circle: protocone; blue circle: hypocone; transverse lines: proto- and metaloph; double arrow: interloph.