Porifera, Cnidaria, Platyhelminthes, Aschelminthes, Annelida, and Cephalochordata lack respiratory organs; only Molluscs, Arthropods, and Echinoderms have them.
Phyla Porifera, Cnidaria, Platyhelminthes, Aschelminthes, Annelida, and Cephalochordata lack respiratory organs, while only Molluscs, Arthropods, and Echinoderms possess them.
| Front | Which phyla do not have respiratory organs |
|---|---|
| Back | Porifera, Cnidaria, Platyhelminthes, Aschelminthes, Annelida, Cephalochordata Only Molluscs, Arthropods & Echinoderms have them |
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