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A new treaty will govern uses of organisms from the open ocean, such as this hydromedusa brought up from a depth of about 2,700 metres in the middle of the Atlantic Ocean.Credit:

On the other hand, some jellyfish species like hydromedusa produce valuable products like fluorescent proteins used in medicine, and other species play key roles in sustaining healthy populations of sea turtles.

Setting out from a laborious and beautiful series of investigations into the anatomy of the Hydromedusæ, Weismann came to think that the organic material from which the sexual cells of these animals arose was not the common protoplasm of their tissues, but a peculiar plasm, distinct in its nature and possibilities.

For he found that among the Hydromedusæ, although the sexual cells seemed to arise in very different topographical positions, there had always been a migration to these localities of a material which he would now call the germplasm.

Hydromedusæ, a group of invertebrate animals, the typical members of which are branched colonies of polyps: Weismann's investigations on, viii, xii.