odontode scale

dermal denticle

Multi-tissue structure composed of enameloid, dentine surrounding a pulp cavity, and bone of attachment anchoring the element into the dermis[VSAO].

Type Bone
Latin Name dermal denticle

Frequently Asked Questions

What tissues make up an odontode scale?
An odontode scale is a multi-tissue mineralized structure consisting of: an outer layer of enameloid (hypermineralized, enamel-like tissue), a middle layer of dentine surrounding a central pulp cavity (containing nerves and blood vessels), and a base of bone of attachment that anchors the element into the dermis. This tooth-like composition reflects the shared evolutionary origin of scales and teeth.
What is the evolutionary significance of odontode scales?
Odontode scales are considered the evolutionary precursors of vertebrate teeth. The 'odontode theory' proposes that the dentition of jawed vertebrates evolved from dermal odontodes — scales that originally covered the body surface. This hypothesis is supported by the structural and developmental similarities between odontodes and teeth across fossil and living species.
Which animals have odontode scales?
Odontode scales are found in several groups of fish including sharks (dermal denticles or placoid scales), some primitive ray-finned fishes, and many extinct early vertebrates. The placoid scales of sharks are classic odontodes, giving shark skin its characteristic rough texture and hydrodynamic properties.

Related Structures

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Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.