What is the relationship between a fierasfer and a sea cucumber?

A fierasfer and a sea cucumber are both echinoderms, meaning they belong to the same phylum, Echinodermata. They share similar characteristics, such as a radial symmetry and a water vascular system, which aids in locomotion and feeding. However, they belong to different classes within this phylum; fierasfers are part of the class Holothuroidea, while sea cucumbers are typically classified within the same class but refer to a specific subset of echinoderms. Overall, they are related through their evolutionary lineage but differ in their specific classifications and ecological roles.