Radiata

The term "Radiata" refers to a group of animals that exhibit radial symmetry and are organized at a tissue level of organization. This means their cells are coordinated to perform specific functions, such as nerve nets and muscle units, allowing for larger body sizes and movement.1

Radiata, which include phyla like Cnidaria and Ctenophora, have two primary body layers: an outer ectoderm for protection and an inner endoderm for feeding. Between these layers is a gelatinous substance called mesoglea. These animals typically have a central cavity that functions as a gut and circulatory system. Their radial symmetry is advantageous for various feeding strategies, as tentacles can capture food from all directions.1

While the term "conch" refers to a type of marine snail, it is not directly related to the classification of Radiata.2