Issued by the USSR (Union of Soviet Socialist Republics) in 1991, this stamp belongs to the Black Sea Fauna thematic series highlighting marine biodiversity. It depicts Anemonia sulcata, commonly known as the Mediterranean or snakelocks sea anemone, illustrated in vivid underwater detail. The scientific labeling reflects the educational and scientific emphasis typical of late Soviet nature issues. Released during the final year of the USSR, this stamp carries additional historical significance for collectors of transitional-period Soviet philately. A desirable item for marine life, fauna, and natural science thematic collections.