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Chordate pharyngeal slits appear to have functioned first as suspension-feeding devices.
What is Chordate pharyngeal slits ?
The third characteristic of chordates is pharyngeal slits, which are holes between the pharynx, or throat, and the outside world. Throughout the evolution history, they have undergone significant modification. These apertures are utilized by early chordates to remove food particles from the water.
Humans are no different from other chordates in having a tail and pharyngeal slits at some time in their existence. The embryo of the human possesses pharyngeal slits and a tail early in development, but both are lost as the human develops.
What is suspension-feeding devices?
Taking in food particles that are suspended in water is known as suspension feeding. Bacteria, phytoplankton, zooplankton, and detritus are some examples of these particles. Others are carnivores, while others that eat at the sediment-water interface are mostly detritivores. Some suspension feeders are principally grazers of planktonic algae. While some suspension feeders are basically nonselective omnivores, others exhibit strong preferences for particular particles based on their size or chemical makeup.
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