The lungfish had been a favorite candidate, since, in addition to gills, it has a swim bladder, which can be used for breathing when it is temporarily out of the water.
Suosituin välimuotoehdokas on ollut keuhkokala, koska sillä kidusten lisäksi on uimarakko, jolla se voi hengittää ollessaan tilapäisesti kuivilla.jw2019 jw2019