Holothuroidea, or better known as sea cucumbers (like our friend Kevin) are apart of the Echinodermata family. Holothuroidea get their name as sea cucumbers because of the fact that they are shaped like cucumbers, with their elongated bodies. They have a mouth at one end and an anus at the other. Near their mouthes, there is a number of tentacles for the purpose of food collecting. There is a quite large variety of size amongst sea cucumbers, ranging to just a couple of centimeters to almost 7 feet! The sea cucumbers have a very basic muscular system. They transport by crawling around the ocean floor.