Cyanea capillata (Cnidaria, Scyphozoa, Semaeostomae, Cyanidae), early medusa, diameter 2 cm, Helgoland 06.2017. 1:03 min This common member of Semaeostomae demonstrates the typical four folded mouth arms, eight groups of tentacles and eight deep incisions at the bell margin, each with a rhopalium at its base. Video can be used for teaching.