The Annelida Skeletal System:
The Annelida's Skeletal System is a fluid and rigid hyrdostatic skeleton and plays a role in the locomotion of the Annelida. This hyrdostatic skeleton makes use of an outer cuticle that is never shed or molted. The hyrdostatic skeleton used by Annelida's consist largely of Coelom fluid which serves to protect the Annelida and facilitate its movements.
Driloleirus Americanus
Each segement of the Dirlolerius Americanus has a cavity known as known as the Coelom, which is filled with fluid creating a hydrostatic water pressure system that acts as the Diroloerius Amercanius support structure and skeleton.
Driloleirus Macelfreshi
The Drilolerius Macelfreshi is divided up into segements known as Septa that act as a skeletal like support system for the body. Most of the Septa also preform the skeletal like function of protecting the Drilolerius Macelfreshi's internal organs. The Drilolerius also has a "Trunk" which is a thicker outer wall and providing it with a definite shape much like an actual skeleton would.
Acrocirrus Validus
The Acrocirrus Validus has its internal organs supported by either Chaetae, , or Aciculae, in the Parapodia. All of these three structures play a role similiar to that of the support system provided by that of a skeleton. These support structures also assist in the locomotive movement of the Acrocirrus Validus.