Actinocyclidae
Actinocyclidae is a family of marine radiolarians, single-celled eukaryotic organisms with intricate siliceous skeletons. They are found in planktonic communities throughout the world’s oceans, playing a crucial role in marine food webs and biogeochemical cycles.
Common Names
Actinocyclidae is not commonly referred to by any particular common name.
Characteristics
Members of the Actinocyclidae family are characterized by their distinctive skeletons, which are typically composed of a central spherical or ovoid body, called a central capsule, surrounded by radiating spines or rays. These skeletons are made of silica and exhibit a variety of complex and intricate patterns. The spines can be solid or hollow, and may be branched or unbranched. Actinocyclidae also possess a unique type of internal structure called a "cytoplasmic reticulum," which is a network of interconnected channels that facilitates intracellular transport.
Environments
Actinocyclidae are found in a wide range of marine environments, from the surface waters to the deep sea. They are particularly abundant in areas with high productivity, such as upwelling zones and coastal waters. Some species are known to exhibit specific adaptations to their environment, such as the development of spines that help them float in the water column.