The size of the animals in adenophorea ranges from microscopic to as long as 3.3 feet (1 meter). A great example of a species in the class adenophorea would be Achromadora sedata. Most of these animals have a hard, sharp spear on their head, while some others have bristles. The body of Adenophoreans are protected by a strong, flexible , and grooved body covering. A layer under this covering releases fluids that harden to form the covering. The body has three tissue layers and a fluid-filled false body cavity, which means that the cavity is in between the inner and middle layers instead of than the middle layer and the outer layer, like how it is in complex animals. The sensing system of these nematodes is made up of holes behind, or in some cases on, the lips.