Molar (Tooth)

• Tribosphenic: This kind is found in insectivores and young platypuses (adults have no teeth). Upper molars look like three-pointed mountain ranges; lowers look like two peaks and a third off to the side.
• Quadrate: This kind is found in humans and various other species. Four cusps are arranged in a rectangle; there may be a fifth.
• Bunodont: The cusps, instead of being sharp peaks, are rounded hills.
• Hypsodont: There is a lot of enamel and dentine above the gumline and the top of the pulp. This kind of molar is found in mammals that wear their teeth a lot, such as the horse.
• Zalambdodont: The tooth has two ridges that meet at an angle, forming the letter lambda.
• Dilambdodont: Like zalambdodont, but there are two lambdas on one tooth.
• Lophodont: The tooth has a few ridges perpendicular to the jaw.
• Selenodont: The tooth has a crescent-shaped ridge or ridges.
• Loxodont: The tooth has several parallel oblique ridges on its surface. The elephant Loxodonta is named for this feature.

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