![]() A peculiar specificity of the lingual teeth is the presence of plicidentine in their basal part. Dentine is divided into two layers: an inner layer of circumpulpal dentine and an external one of pallial dentine. The lingual teeth are 4 mm long and 1.0 to 1.5 mm wide they are constituted of a cone of orthodentine with a distal cap of enameloid. On the basibranchial toothplate the teeth are closely set but without any connection, contrary to the coalesced teeth. The lingual teeth appear early during ontogeny of the hyoid and branchial skeleton. The pirarucu, Arapaima gigas (Osteoglossidae) has a basibranchial toothplate that supports a great density of teeth and helps the food transfer from the oral cavity towards the oesophagus. ![]() 1 Morphological and histological data on the structure of the lingual toothplate of Arapaima gigas (Osteoglossidae Teleostei) by François J.
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