part_of part of part of existence overlaps existence starts during or after independent continuant Stage 3 Stage 4 Stage 5 Stage 6 Stage 7 Stage 8 embryonic pharynx mouth juvenile stage oral opening PMID:30399335 The orifice that connects the mouth to the exterior of the body. pharynx opening pharyngeal mouth opening PMID:29674431 UBERON:0000166 Planarian_Anatomy PMID:17670787 https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4407 adult hermaphrodite asexual adult anatomical cavity