| chile | | ciona robusta | species | 2 | 0 |
| china | | ciona intestinalis | species | 1 | 0 |
| france | | ciona intestinalis | species | 1 | 0 |
| france | bretagne region | ciona intestinalis | species | 5 | 0 |
| germany | schleswig-holstein | ciona intestinalis | species | 6 | 0 |
| israel | southern district | ciona robusta | species | 101 | 0 |
| italy | | ciona intestinalis | species | 16 | 0 |
| italy | campania region | ciona intestinalis | species | 102 | 0 |
| italy | veneto region | ciona intestinalis | species | 1 | 0 |
| japan | | ciona intestinalis | species | 2 | 0 |
| japan | | ciona robusta | species | 3 | 0 |
| japan | aichi prefecture | ciona intestinalis | species | 12 | 0 |
| japan | hyogo prefecture | ciona intestinalis | species | 8 | 0 |
| japan | ibaraki prefecture | ciona intestinalis | species | 2 | 0 |
| japan | kanagawa prefecture | ciona intestinalis | species | 8 | 0 |
| japan | kanagawa prefecture | ciona savignyi | species | 4 | 0 |
| japan | kyoto prefecture | ciona robusta | species | 4 | 0 |
| japan | niigata prefecture | ciona savignyi | species | 4 | 0 |
| netherlands | | ciona intestinalis | species | 1 | 0 |
| netherlands | zeeland province | ciona intestinalis | species | 1 | 0 |
| new zealand | | ciona intestinalis | species | 1 | 0 |
| new zealand | | ciona savignyi | species | 1 | 0 |
| new zealand | nelson | ciona intestinalis | species | 2 | 0 |
| norway | | ciona intestinalis | species | 1 | 0 |
| portugal | setubal district | ciona robusta | species | 2 | 0 |
| south korea | | ciona intestinalis | species | 1 | 0 |
| south korea | | ciona robusta | species | 9 | 0 |
| spain | catalonia | ciona robusta | species | 14 | 0 |
| spain | galicia | ciona intestinalis | species | 0 | 3 |
| spain | valencia | ciona intestinalis | species | 1 | 0 |
| united kingdom | england | ciona intestinalis | species | 748 | 1 |
| united kingdom | england | ciona intestinalis b cg-2006 | no rank | 1 | 0 |
| united kingdom | scotland | ciona intestinalis | species | 17 | 0 |
| united states | | ciona intestinalis | species | 1 | 0 |
| united states | california | ciona intestinalis | species | 2 | 0 |
| united states | california | ciona robusta | species | 1 | 0 |
| united states | california | ciona savignyi | species | 18 | 0 |
| united states | massachusetts | ciona intestinalis complex sp. b sensu caputi et al. (2007) | species | 2 | 0 |