http://en.wikipedia.org/wiki/Pharyngeal_slit
Pharyngeal slits are filter-feeding organs found in non-vertebrate chordates (lancelets andtunicates) and hemichordates living in aquatic environments. These repeated segments are controlled by similar developmental mechanisms. Some hemichordate species can have as many as 200 gill slits.Pharyngeal slits resembling gill slits are transiently present during the embryonic stages of tetrapod development.
Pharyngeal slits are filter-feeding organs found in non-vertebrate chordates (lancelets andtunicates) and hemichordates living in aquatic environments. These repeated segments are controlled by similar developmental mechanisms. Some hemichordate species can have as many as 200 gill slits.Pharyngeal slits resembling gill slits are transiently present during the embryonic stages of tetrapod development.
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