aquarium medusa

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Jellyfish, also known as sea jellies or simply jellies, are the medusa-phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals, although a few are anchored to the seabed by stalks rather than being motile. They are made of an umbrella-shaped main body made of mesoglea, known as the bell, and a collection of trailing tentacles on the underside.

August David Krohn ( * San Petersburgo, 1803 – 1891) fue un zoólogo ruso, de origen germano. Fue hijo de Abraham Krohn, fundador de la primera cervecería de Rusia, que se encontraba en la isla de Rügen para servir en la corte de Catalina la Grande. Y era tío del folclorista y activista del Movimiento Fennoman Julius Krohn.