Table 2. Year in which Gymnodinium species were described for oncers and species that have been observed in multiple samples.
| Year Described | ||
| Seen Once | Seen Again | |
| Oldest | 1878 | 1877 |
| Youngest | 1997 | 2011 |
| Mode | 1957 | 1921 |
| Median | 1957 | 1931 |
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