What's the difference between acrodont and thecodont?

Acrodont


Definition:

  • (n.) One of a group of lizards having the teeth immovably united to the top of the alveolar ridge.
  • (a.) Of or pertaining to the acrodonts.

Example Sentences:

  • (1) The greatest variations in tooth attachment have originated in acrodont bony fishes and in pleurodont reptiles, whereas the selection for a single thecodont or socketed type was an important event in the evolution of mammals.
  • (2) On the basis of the comparative histology of periodontal tissues, protoacrodontal, acrodontal, acro-protothecodontal, pleurodontal and thecodontal structures can be distinguished that depend upon the area of attachment (crestal, marginal or socketed type) and the mode of attachment (ankylosis, fibrous or combined type).
  • (3) In Uromastix the dentition is acrodont and the cheek teeth are massive and lack cusps.

Thecodont


Definition:

  • (a.) Having the teeth inserted in sockets in the alveoli of the jaws.
  • (a.) Of or pertaining to the thecodonts.
  • (n.) One of the Thecodontia.

Example Sentences:

  • (1) The greatest variations in tooth attachment have originated in acrodont bony fishes and in pleurodont reptiles, whereas the selection for a single thecodont or socketed type was an important event in the evolution of mammals.
  • (2) On the basis of the comparative histology of periodontal tissues, protoacrodontal, acrodontal, acro-protothecodontal, pleurodontal and thecodontal structures can be distinguished that depend upon the area of attachment (crestal, marginal or socketed type) and the mode of attachment (ankylosis, fibrous or combined type).
  • (3) As in the thecodont mammals, the compressive biting (= occlusal) force is transformed into a tensile force by the tooth-fixing apparatus and by the shapes of the jaws and this is sustained by fibrous structures.

Words possibly related to "acrodont"

Words possibly related to "thecodont"