👉 Helicarionoidea is a group of marine invertebrates that includes the genus "Helicarion". These animals are known for their unique characteristics, including their hard shells, which are composed primarily of calcium carbonate and often have intricate patterns or designs. They are also known for their ability to change color based on their environment, with some species exhibiting a range of colors from bright yellow to dark green. The group includes various types of cephalopods, such as the "Hel