Class Tentaculata is a group of exclusively aquatic animals characterized by their tentacles. They have a well-developed oral cone bearing a set of tentacles used for feeding and locomotion. The group is mainly composed of two subclasses, namely Kolpophorae and Cydippida. The Tentaculata class includes a wide range of different organisms such as jellyfish, comb jellies, and sea walnuts. These creatures have different shapes and sizes, but the defining feature is their tentacles. While Class Tentaculata is the official name for this group, there are several synonyms that can be used, including Ctenophora and comb jellies. These synonyms refer specifically to a subclass within this group and are commonly used in research papers and scientific literature.