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This habitat is composed of Ostrea edulis biogenic reefs of three dimensional structure on soft bottoms. The massive reefs can reach dimensions of up to 7m in height and are composed of dead Ostrea edulis shells and cemented tubes of serpulid are overgrown by blue mussels, sponges, the red algae Delesseria ruscifolia, the brown algae Xanardinia prototypus, crabs such as Eriphia verrucosa and also constitute essential habitat for the bivalve Petricola lithophaga. It is unknown whether live Ostrea edulis reefs can still be found in the Black Sea.