Mysterious pitch black-eggs discovered in Pacific Ocean trench

The elusive black spheres turned out to be the cocoons of flatworms, scientifically known as platyhelminths.

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Pacific Kuril ,Pacific Ocean ,Keiichi Kakui ,Hokkaido University Museum ,Hokkaido University ,Kuril Kamchatka Trench ,Yasunori Kano ,Biology Letters ,Black Eggs ,Oceans ,Oceanography ,