Key Difference – Platyhelminthes vs Aschelminthes Platyhelminthes and Aschelminthes are major invertebrate phyla of the Kingdom Animalia. Platyhelminthes are acoelomates while Aschelminthes are pseudo-coelomates. This is the key difference between Platyhelminthes and Aschelminthes. Invertebrates are defined as animals that lack a backbone. Other major phyla that include invertebrates are Cnidaria, Annelida, Arthropoda, Mollusca, and […]