Respiration in cyclostomes

Cyclostomes, which include lampreys and hagfish, are primitive jawless fish that exhibit unique respiratory adaptations. They possess gill slits instead of gills with operculum, a feature present in most higher vertebrates. Respiration in cyclostomes occurs primarily through their ____ ___ __________ ______ _______ ___ ___ ___ ______ ______ _______ ____.
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