Pleurodont

Pleurodont is a term used in herpetology to describe a specific type of tooth attachment in certain reptiles. In pleurodont dentition, the teeth are fused by their sides to the inner surface of the jawbone, rather than being set in individual sockets. This type of tooth attachment is commonly found in various species of lizards and some other reptiles.

Characteristics

Pleurodont teeth are typically ankylosed, meaning they are directly attached to the jawbone without the presence of a socket. This type of attachment allows for the replacement of teeth throughout the reptile's life, as new teeth can grow in to replace old or damaged ones. The pleurodont condition is contrasted with acrodont and thecodont dentition, which have different modes of tooth attachment.

Distribution

Pleurodont dentition is primarily observed in members of the Lacertilia suborder, which includes a wide variety of lizard families such as Iguanidae, Agamidae, and Chamaeleonidae. It is less common in other reptilian groups.

Evolutionary Significance

The evolution of pleurodont dentition is significant in the study of reptilian phylogeny. It provides insights into the adaptive strategies of different reptile groups and their evolutionary history. The ability to continuously replace teeth is advantageous for species that rely on their teeth for capturing and processing prey.

Comparison with Other Dentition Types

• Acrodont - In acrodont dentition, the teeth are fused to the crest of the alveolar ridge of the jaw without sockets. This type is seen in some lizards, such as those in the family Agamidae.
• Thecodont - Thecodont dentition features teeth set in sockets, a condition seen in archosaurs like crocodiles and dinosaurs.

Examples of Pleurodont Reptiles

• Green Iguana (Iguana iguana)
• Anole (Anolis)
• Gecko (various species)

See Also

• Dentition
• Herpetology
• Reptile anatomy
• Lizard