| Authors(s) | Spoel, S. van der |
| Year | 1963 |
| Title | A new forma of the species Clio pyramidata Linnaeus, 1767 and a new resting stage of Clio pyramidata Linnaeus, 1767 forma sulcata (Pfeffer, 1879) (Gastropoda, Pteropoda). Beaufortia 10 (114): 19-28. |
| Authors(s) | Spoel, S. van der |
| Year | 1963 |
| Title | A new forma of the species Clio pyramidata Linnaeus, 1767 and a new resting stage of Clio pyramidata Linnaeus, 1767 forma sulcata (Pfeffer, 1879) (Gastropoda, Pteropoda). Beaufortia 10 (114): 19-28. |