The Worm is a medium-sized defense tower of the Evolved Army. As the name suggests, it is a Worm mutated by radioactive radiation that the army of the Evolved had domesticated.
The Crinoid is created when you cut a Worm below the head. The head can survive independently without the rest of the body. It is mobile and has amphibious properties. Like a Worm, the Crinoid can secrete an acid-like liquid that it uses as an attack weapon.