part of part of in taxon develops from develops from capable of part of capable of part of feeding behavior Deuterostomia Vertebrata <vertebrates> chordate pharynx endoderm-derived structure early pharyngeal endoderm pharyngeal slit https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Gill_slits.png/280px-Gill_slits.png Some hemichordate species can have as many as 200 gill slits pharyngeal perforation homologous to pharyngeal pouches An organ formed from the perforation between the point of contact between ectoderm and endoderm in the pharynx. The slits assist in filtering food particles from the water. UBERON:0008815 may have been present in deuterostome ancestor[PMID:11961109] Wikipedia:Pharyngeal_slit gill slit requires review. Kardong uses the term pharyngeal slit for Chondrichthyans. 'branchial slit' may also be used for amniote structures. digestive system element