Seildýr (fræðiheiti Chordata) eru fylking dýra sem telur meðal annars hryggdýr og nokkra skylda hryggleysingja.
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![]() Röntgentetra með sýnilega seil | ||||||||
Vísindaleg flokkun | ||||||||
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Helstu flokkar | ||||||||
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