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Invertebrate Chordates (Notochord (flexible, rodlike structure that…
Invertebrate Chordates
Notochord
flexible, rodlike structure that extends the length of the body
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In most vertebrates, its replaced by bone or cartilage
invertebrate chordates, the notochord remains
Postanal tail
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In most chordates, the postanal tail extends beyond the anus
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Tails in nonchor- dates have parts of the digestive system inside and the anus is located at the end of the tail
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Ancestral thyroid gland
a structure that regulates metabolism, growth, and development
An early form of a thyroid gland had its origins in cells of early chordates that secreted mucus as an aid in filter feeding
Invertebrate chordates have an endostyle—cells in this same area that secrete pro- teins similar to those secreted by the thyroid gland
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Pharyngeal pouches
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In aquatic chordates, the pouches contain slits that lead to the outside
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In terrestrial chordates, the pharyngeal pouches do not contain slits and develop into other structures, such as the tonsils and the thymus gland