In biology, a medusa (plural: medusae) is a form of cnidarian in which the body is shortened on its principal axis and broadened, sometimes greatly, in contrast with polyps. Medusae vary from bell-shaped to the shape of a thin disk, scarcely convex above and only slightly concave below. There are lot of different types of medusae, and most of them induce panic among the swimmers; most of them aren’t poisonous and dangerous. Now, we choose the most beautiful of them, seen through the eyes of photographers.
