Question

The MOST distinctive feature of ape dentition, which clearly distinguishes apes from Old World monkeys, is

Answer 1

The most distinctive feature of ape dentition, which clearly distinguishes apes from Old World monkeys, is a Y-5 molar pattern.

What is the Y-5 molar pattern?

• This is a distinctive type of molar teeth pattern found in apes and hominoids.
• In this, 5 cusps or raised surfaces are present on the grinding surface of teeth, roughly forming a Y- shape. Therefore, this is also known as Y-5 pattern.
• Whereas Old world monkeys have only 4 cusps on their lower molars present in a bilophodont pattern.
• A Y-5 molar is formed when the tooth is divided into different pieces which form the complete structure of the tooth.
• In bilophodont pattern the tooth is divided into 2 symmetric sections.
• The dental formula of apes is 2.1.2.3/2.1.2.3 i.e. 2 incisors, 1 canine, 2 premolars, 3 molars.

Learn more about dentition in apes here:

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