Is the aestivating lungfish the first vertebrate with suctional breathing?
D000222:Adaptation, Physiological; D000818:Animals; D005075:Biological Evolution; D004956:Estivation; D005399:Fishes / Q000033:anatomy & histology / Q000502:physiology*; D008168:Lung / Q000502:physiology; D012119:Respiration