Table 1.
ICTV taxonomic classification of viroids (2020). The 33 viroids are grouped into two families: Pospiviroidae, with five genera, and Avsunviroidae, with three genera. The type species of each genus is highlighted on a gray background. For each species, the abbreviation of its name is indicated.
| Family Pospiviroidae | ||
|---|---|---|
| Genus Pospiviroid | PSTVd | Potato spindle tuber viroid |
| CEVd | Citrus exocortis viroid | |
| CSVd | Chrysanthemum stunt viroid | |
| CLVd | Columnea latent viroid | |
| IrVd-1 | Iresine viroid 1 | |
| PCFVd | Pepper chat fruit viroid | |
| TASVd | Tomato apical stunt viroid | |
| TCDVd | Tomato chlorotic dwarf viroid | |
| TPMVd | Tomato planta macho viroid | |
| Genus Hostuviroid | HSVd 1 | Hop stunt viroid |
| DLVd | Dahlia latent virus | |
| Genus Apscaviroid | ASSVd | Apple scar skin viroid |
| ADFVd | Apple dimple fruit viroid | |
| AGVd | Australian grapevine viroid | |
| CBLVd 1 | Citrus bent leaf viroid | |
| CDVd 1 | Citrus dwarfing viroid | |
| CVd-V 1 | Citrus viroid V | |
| CVd-VI 1 | Citrus viroid VI | |
| GYSVd-1 | Grapevine yellow speckle viroid 1 | |
| GYSVd-2 | Grapevine yellow speckle viroid 2 | |
| PBCVd | Pear blister canker viroid | |
| Genus Cocadviroid | CCCVd | Coconut cadang-cadang viroid |
| CTiVd | Coconut tinangaja viroid | |
| CBCVd 1 | Citrus bark cracking viroid | |
| HLVd | Hop latent viroid | |
| Genus Coleviroid | CbVd-1 | Coleus blumei viroid 1 |
| CbVd-2 | Coleus blumei viroid 2 | |
| CbVd-3 | Coleus blumei viroid 3 | |
| Family Avsunviroidae | ||
| Genus Avsunviroid | ASBVd | Avocado sunblotch viroid |
| Genus Pelamoviroid | PLMVd | Peach latent mosaic viroid |
| CChMVd | Chrysanthemum chlorotic mottle viroid | |
| AHVd | Apple hammerhead viroid | |
| Genus Elaviroid | ELVd | Eggplant latent viroid |
1 Names of some viroid species have been re-established by ICTV. This particularly affects citrus viroids, such as CBCVd (formerly citrus viroid IV), CBLVd (formerly citrus viroid I), CDVd (formerly citrus viroid III), HSVd (formerly citrus viroid II) and CVd-V and VI (formerly citrus viroid-OS).