The pseudocoelom is a body cavity filled with fluid that lies between the mesoderm layer of the external body wall and the endoderm layer of the gut in invertebrates.
The mesodermal tissues do not line the pseudocoelom completely.
The nutrients are transported by diffusion.
Internal organs are not well organized.
It lacks mesenteries.
It acts like a hydrostatic skeleton which helps in locomotion.
It includes the reproductive and excretory organs.