👉 Cytheroidea is a group of animals that are known for their complex, highly specialized structures found in aquatic environments, including organs like gills and hearts. These organisms have evolved to efficiently extract oxygen from water through specialized cells called haemocytes, which can be found in the lungs or in the gut. They also exhibit remarkable adaptations such as the presence of multiple blood vessels and the development of a central nervous system that allows for complex communication with other members of their group.
