RESPIRATORY ORGANS OF ANIMALS

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