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Oscilliva is a genus of extinct echinoderms that lived during the Early Ordovician period, approximately 480-485 million years ago. These marine animals were part of the phylum Echinozoa, which also includes modern day classes like Echinoidea (sea urchins and sand dollars) and Ophiuroidea (brittle stars).

Oscilliva fossils are typically found in sedimentary rocks such as limestone and sandstone. The genus is characterized by its distinctive round or oval-shaped shells, which are often divided into multiple sections or compartments. These shells may have been covered in spines or other structures, which could have provided additional support or protection.

The exact function and purpose of Oscilliva's shells are not well understood, but they are thought to have been used for feeding, respiration, or protection from the environment. Some species of Oscilliva may have also had a more complex body plan, featuring multiple arms or appendages.

The discovery of Oscilliva fossils has provided valuable insights into the evolution of echinoderms and the diversity of marine life during the Ordovician period. However, the classification of Oscilliva remains incomplete, and further research is needed to fully understand its relationships to other extinct and living echinoderm groups.

Studies have also suggested that the shell shape and morphology of Oscilliva species may have been influenced by environmental factors, such as the availability of food or the presence of predators. By studying the fossil record and comparing Oscilliva to modern echinoderms, scientists can gain a better understanding of the complex interactions and adaptations that have shaped the evolution of these animals over millions of years.