| china | | halophila ovalis | species | 15 | 0 |
| egypt | north sinai governorate | halophila ovalis | species | 1 | 0 |
| fiji | central division | halophila ovalis | species | 23 | 0 |
| fiji | western division | halophila ovalis | species | 259 | 0 |
| hong kong | | halophila ovalis | species | 1 | 0 |
| india | | halophila ovalis | species | 5 | 0 |
| india | | halophila ovalis subsp. ramamurthiana | subspecies | 1 | 0 |
| india | andaman and nicobar islands | halophila ovalis | species | 2 | 0 |
| india | tamil nadu | halophila ovalis | species | 2 | 0 |
| india | tamil nadu | halophila ovalis subsp. ramamurthiana | subspecies | 1 | 0 |
| japan | okinawa prefecture | halophila ovalis | species | 11 | 0 |
| malaysia | sarawak | halophila ovalis | species | 1 | 0 |
| saudi arabia | | halophila ovalis | species | 2 | 0 |
| sri lanka | | halophila ovalis | species | 10 | 0 |
| thailand | | halophila ovalis | species | 2 | 0 |
| thailand | satun province | halophila ovalis | species | 2 | 0 |
| thailand | trang province | halophila ovalis | species | 25 | 0 |