| Phylum | Respiratory organ | |
| Porifera | Body surface | |
| Cnidaria | Body surface | |
| Ctenophora | Body surface | |
| Platyhelminthes | Body surface | |
| Nemathelminthes | Body surface | |
| Annelida | Skin (integument) | |
| Arthropoda | Aquatic insects (mayflies, nymphs etc) | Tracheal gills |
| Damselfly nymphs | Caudal gills | |
| Limulus | Gill books | |
| Scorpion, some spiders, Scutigera and chilopods | Book lungs (Diffusion lungs) | |
| Insects, some spiders | Trachea | |
| Some crabs (e.g. coconut crabs) | Branchiostegal lung (gill-like lung) | |
| Mollusca | Skin (Cutaneous) | |
| Aquatic forms | Ctenidia (gills) | |
| Terrestrial forms | Pulmonary sacs (lungs) | |
| Echinodermata | Dermal branchiae (skin gills) | |
| Holothurians | Water lungs | |
| Hemichordata | Gills | |
| Chordata | Lungfishes | Ventilation lungs |
| Fishes | Internal gills, lungs (for lung fishes) | |
| Some teleost fishes | Swim bladder (air bladder) | |
| Fishes such as Misgurnus, Ancistrus and Plecostomus | Alimentary mucosa | |
| Labyrinth fish | Labyrinth organ – A secondary breathing organ | |
| Amphibians | Skin, lungs, external gills (for tadpoles) | |
| Reptiles | Ventilation Lungs | |
| Birds | Ventilation Lungs | |
| Mammals | Ventilation Lungs | |
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