[Radiolaria Polycystina] In Nassellaria: protruding apophyses around the mouth, of variable length and thickness (= oral teeth, adoral teeth, terminal teeth, subterminal teeth) (shell structure 2).

[Radiolaria Phaeodaria] Spines surrounding the mouth (Phaeodarian cell 2), or (Concharidae) tiny spines along hingeline (Phaeodarian cell features 11).

[Chaetognatha] Small spines anterior to the mouth arranged in one or two rows — the latter then differentiated in the anterior [AT] and posterior teeth [PT] (head, dorsal view).

Alternative forms for Teeth : Anterior teeth, AT, Oral spines, Posterior teeth, PT.