Lysell classification
A 1955 system using uppercase letters to encode rugae shapes: A (straight), B (curved), C (angled), D (sinuous), E (circular), F (irregular). One of the first systematic attempts at a codifiable rugae taxonomy.
A 1955 system using uppercase letters to encode rugae shapes: A (straight), B (curved), C (angled), D (sinuous), E (circular), F (irregular). One of the first systematic attempts at a codifiable rugae taxonomy.
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