👉 Lithoaphis is a genus of small, flattened aquatic animals in the family Echinidae, which include the common carp (Euphausia fetida). These fish are commonly found in freshwater habitats such as rivers and lakes. They have a distinctive, smooth surface that can be seen from afar due to their elongated bodies. Lithoaphis is characterized by its small size, which makes them ideal for aquatic environments where space may not be an issue. They are also