has part has part in taxon develops from develops from has developmental contribution from has developmental contribution from immediate transformation of Echidna Aves Ornithorhynchus Mysticeti stomodeum calcareous tooth http://upload.wikimedia.org/wikipedia/commons/1/14/Teeth_by_David_Shankbone.jpg NCIT:C12506 MESH:D014070 UBERON:0001091 EV:0100063 CALOHA:TS-1055 EFO:0000839 TAO:0001625 absent in living platypus, present in toothed Miocene platypus Obduron dicksoni MAT:0000041 dental UMLS:C0040426 FMA:12516 SCTID:302214001 tooth dentine containing tooth vertebrate tooth dental element Wikipedia:Tooth BTO:0000397 MA:0000348 VHOG:0001733 The ancestor of recent vertebrate teeth was a tooth-like structure on the outer body surface of jawless fishes.[well established][VHOG] EMAPA:32906 EHDAA2:0004605 EDITOR_NOTE we place ZFA ctb 5 tooth here for now. Consider changing name from calcaeeous tooth. Note that sea cucumbers develop calcareous tooth-like structures MIAA:0000041 AEO:0000220 Skeletal element within the mouth (or in some species, upper part of the digestive tract) that is composed of dentine and is used in procuring or masticating food. XAO:0000431 GAID:1260 dentine tooth-like structure tooth enamel organ tooth bud structure with developmental contribution from neural crest