👉 Tentaculata is a type of animal in the class of echinoderms (also known as bivalves) that has an umbilical cord or tentacles attached to the sides of its head. These animals are also called "tentaclefish" because their body and limbs resemble tentacles. The term "tentaculata" is derived from the Latin word "tentaculum," which means "tentacle." The name was given by Charles Darwin, a biologist