| Citation | Yakovlev, S.N., 1987 Gonad cycle and reproduction of the heart urchin in the Sea of Japan. Biologiya Morya (vladivostok) 6:38-43. |
| Ref. | 105729 Yakovlev, S.N., 1987 |
| Page | |
| Named Used as Valid | Echinocardium cordatum |
| Locality | |
| Distribution | Sea of Japan. |