| australia | tasmania | neosiphonia japonica | species | 1 | 0 |
| australia | western australia | neosiphonia japonica | species | 7 | 0 |
| canada | british columbia | neosiphonia sp. 21gws | species | 3 | 0 |
| canada | new brunswick | neosiphonia echinata | species | 7 | 0 |
| canada | new brunswick | neosiphonia harveyi | species | 22 | 0 |
| canada | nova scotia | neosiphonia echinata | species | 9 | 0 |
| canada | nova scotia | neosiphonia harveyi | species | 39 | 0 |
| canada | prince edward island | neosiphonia harveyi | species | 4 | 0 |
| chile | antofagasta region | neosiphonia peruviensis | species | 7 | 0 |
| china | | neosiphonia japonica | species | 21 | 0 |
| france | bretagne region | neosiphonia flavimarina | species | 1 | 0 |
| france | bretagne region | neosiphonia harveyi | species | 2 | 0 |
| indonesia | | neosiphonia echinata | species | 2 | 0 |
| ireland | leinster province | neosiphonia harveyi | species | 1 | 0 |
| japan | | neosiphonia yendoi | species | 4 | 0 |
| japan | chiba prefecture | neosiphonia yendoi | species | 2 | 0 |
| japan | hokkaido prefecture | neosiphonia japonica | species | 2 | 0 |
| japan | hokkaido prefecture | neosiphonia yendoi | species | 6 | 0 |
| japan | nara prefecture | neosiphonia yendoi | species | 6 | 0 |
| new zealand | wellington | neosiphonia harveyi | species | 1 | 0 |
| panama | bocas del toro province | neosiphonia sp. 1 dwf-2011 | species | 3 | 0 |
| panama | colon province | neosiphonia ferulacea | species | 5 | 0 |
| panama | colon province | neosiphonia tongatensis | species | 3 | 0 |
| peru | | neosiphonia peruviensis | species | 1 | 0 |
| south korea | | neosiphonia yendoi | species | 3 | 0 |
| south korea | busan city | neosiphonia yendoi | species | 6 | 0 |
| south korea | gangwon province | neosiphonia yendoi | species | 15 | 0 |
| south korea | gyeonggi province | neosiphonia yendoi | species | 4 | 0 |
| south korea | jeju province | neosiphonia sp. 1 msk-2013 | species | 3 | 0 |
| south korea | jeju province | neosiphonia sp. 2 msk-2013 | species | 4 | 0 |
| south korea | jeju province | neosiphonia sphaerocarpa | species | 52 | 0 |
| south korea | jeju province | neosiphonia yendoi | species | 8 | 0 |
| south korea | north chungcheong province | neosiphonia flavimarina | species | 1 | 0 |
| south korea | north gyeongsang province | neosiphonia yendoi | species | 7 | 0 |
| south korea | south gyeongsang province | neosiphonia yendoi | species | 20 | 0 |
| south korea | ulsan city | neosiphonia yendoi | species | 2 | 0 |
| spain | | neosiphonia subtilissima | species | 2 | 0 |
| thailand | | neosiphonia thailandica | species | 3 | 0 |
| united kingdom | england | neosiphonia harveyi | species | 5 | 0 |
| united kingdom | wales | neosiphonia elongella | species | 1 | 0 |
| united kingdom | wales | neosiphonia harveyi | species | 1 | 0 |
| united states | | neosiphonia echinata | species | 1 | 0 |
| united states | california | neosiphonia harveyi | species | 1 | 0 |
| united states | florida | neosiphonia echinata | species | 2 | 0 |
| united states | florida | neosiphonia sphaerocarpa | species | 2 | 0 |
| united states | florida | neosiphonia subtilissima | species | 2 | 0 |
| united states | florida | neosiphonia tepida | species | 1 | 0 |
| united states | maine | neosiphonia harveyi | species | 13 | 0 |
| united states | massachusetts | neosiphonia harveyi | species | 25 | 0 |
| united states | north carolina | neosiphonia harveyi | species | 8 | 0 |
| united states | rhode island | neosiphonia harveyi | species | 17 | 0 |
| united states | rhode island | neosiphonia japonica | species | 9 | 0 |
| vietnam | khanh hoa province | neosiphonia thailandica | species | 1 | 0 |