What is the importance of endostyle in lancelets and ascidians?
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The lancelets — also known as amphioxi(singular, amphioxus) consist of about 32 species of fish-like marine chordates in the order Amphioxiformes. They are distributed in shallow and coastal temperate as Norway, subtropical and tropical seas around the world, usually found half-buried in sand. The only exception is Asymmetron inferum, a species known from the vicinity of whale falls at a depth of about 225 m.
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In lancelets and ascidians (sea squirts), endostyle is a part of the digestive system that aids in filter feeding.
- Endostyle is a glandular organ lying below the two rows of gill slits in lower-chordates.
- It filters suspended food particles from the water as it coats itself with mucus using cilia.
- The mucus sticks to the food particles suspended in the water which is then passed through the pharynx and then to the esophagus by the ciliary movements.
Note: As the endostyle absorbs iodine, an evolutionary link has been suggested between this organ and the thyroid gland of vertebrates.
You may find some more information here.
What are lancelets and give the example?
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Compare and contrast sea squirts and lancelets.
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