Coral polyps.

There are several aktinia species and one species of octocorallians in the White sea.

The soft coral Gersemia fruticosa. These beautiful corals may form the real forests in the 20 m depth!

This is a big actinia Tealia felina, it reaches 25 cm in diameter. This species isn't rare but it doesn't form big accumulations.

This is the biggest White sea actinia - Metridium senile. It has very many tentacles, the big specimens over 30 cm in length may have a thousand of them! These actinias feed on everything from zooplankton to big fishes.

I don't know what it is. I used to cut this actinia and look at the size of the pharyngeal cnidocytes. It may be a small Tealia felina or Stomphia coccinea (this species is more rare).

Actually I'm not sure that that was a coral polyp. It might be also the scyphozoan polyp generation (scyphystoma). Nonetheless I think that this is Haliactis arctica, one more species of actinia.

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