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Caution: This not an official Baltimore classification, because it describes mostly viroids that are not viruses (they don't encode for any protein).
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| Family/genus | Type | Min length | Max length |
| Deltavirus | Circular | 1,614 b | 1,697 b |
| Avsunviroidae | Circular | 240 b | 340 b |
| Pospiviroidae | Circular | 240 b | 400 b |