| antarctica | | alexandrium tamarense species complex group iv | species | 19 | 0 |
| argentina | chubut province | uncultured alexandrium | species | 2 | 0 |
| australia | new south wales | alexandrium pacificum | species | 4 | 0 |
| australia | south australia | alexandrium catenella | species | 2 | 0 |
| australia | south australia | alexandrium minutum | species | 17 | 0 |
| australia | south australia | alexandrium sp. rfs-2009a | species | 4 | 0 |
| australia | tasmania | alexandrium affine | species | 1 | 0 |
| australia | tasmania | alexandrium catenella | species | 1 | 0 |
| australia | tasmania | alexandrium margalefii | species | 1 | 0 |
| australia | tasmania | alexandrium tamarense | species | 3 | 0 |
| australia | victoria | alexandrium catenella | species | 3 | 0 |
| australia | victoria | alexandrium tamarense species complex group iv | species | 6 | 0 |
| brazil | | alexandrium catenella | species | 6 | 0 |
| brazil | | alexandrium tamutum | species | 1 | 0 |
| brazil | bahia | alexandrium tamiyavanichi | species | 6 | 0 |
| brazil | rio de janeiro | alexandrium tamutum | species | 4 | 0 |
| canada | | alexandrium ostenfeldii | species | 2 | 0 |
| canada | british columbia | alexandrium ostenfeldii | species | 2 | 0 |
| canada | nova scotia | alexandrium fundyense | species | 1 | 0 |
| chile | | alexandrium catenella | species | 10 | 0 |
| chile | | alexandrium ostenfeldii | species | 2 | 0 |
| chile | aysen region | alexandrium tamarense | species | 1 | 0 |
| chile | aysen region | alexandrium tamarense species complex group i | species | 3 | 0 |
| china | | alexandrium affine | species | 5 | 0 |
| china | | alexandrium catenella | species | 9 | 0 |
| china | | alexandrium insuetum | species | 3 | 0 |
| china | | alexandrium minutum | species | 2 | 0 |
| china | | alexandrium ostenfeldii | species | 2 | 0 |
| china | | alexandrium tamarense | species | 11 | 0 |
| china | | uncultured alexandrium | species | 9 | 0 |
| china | guangdong | alexandrium tamarense species complex group iv | species | 16 | 0 |
| china | guangxi | alexandrium catenella | species | 2 | 0 |
| china | guangxi | alexandrium tamarense species complex group iv | species | 17 | 0 |
| china | jiangxi | alexandrium catenella | species | 2 | 0 |
| china | jiangxi | alexandrium minutum | species | 1 | 0 |
| china | jiangxi | alexandrium tamutum | species | 1 | 0 |
| china | shandong | alexandrium affine | species | 2 | 0 |
| china | shandong | alexandrium andersonii | species | 2 | 0 |
| china | shandong | alexandrium leei | species | 3 | 0 |
| china | shandong | alexandrium minutum | species | 1 | 0 |
| china | shandong | alexandrium ostenfeldii | species | 11 | 0 |
| china | shandong | alexandrium pseudogoniaulax | species | 5 | 0 |
| china | sichuan | alexandrium tamarense species complex group iv | species | 6043 | 0 |
| china | zhejiang | alexandrium pacificum | species | 1 | 0 |
| china | zhejiang | alexandrium tamarense | species | 0 | 1 |
| denmark | | alexandrium minutum | species | 1 | 0 |
| denmark | | alexandrium ostenfeldii | species | 8 | 0 |
| denmark | capital region of denmark | alexandrium ostenfeldii | species | 1 | 0 |
| finland | | alexandrium ostenfeldii | species | 7 | 0 |
| france | | alexandrium minutum | species | 10 | 0 |
| france | bretagne region | alexandrium minutum | species | 2 | 0 |
| france | corse region | alexandrium insuetum | species | 2 | 0 |
| france | haute-normandie region | alexandrium minutum | species | 1 | 0 |
| france | haute-normandie region | alexandrium sp. antifer_91/1 | species | 1 | 0 |
| france | languedoc-roussillon region | alexandrium sp. thau_lagoon_3 | species | 2 | 0 |
| gibraltar | | alexandrium affine | species | 1 | 0 |
| greece | | alexandrium minutum | species | 1 | 0 |
| greece | central macedonia region | alexandrium taylori | species | 1 | 0 |
| greenland | | alexandrium fundyense | species | 22 | 0 |
| greenland | | alexandrium ostenfeldii | species | 56 | 0 |
| greenland | | alexandrium tamutum | species | 1 | 0 |
| hong kong | | alexandrium affine | species | 9 | 0 |
| hong kong | | alexandrium pacificum | species | 6 | 0 |
| hong kong | | alexandrium tamarense | species | 1 | 0 |
| hong kong | | alexandrium tamarense species complex group iv | species | 24 | 0 |
| iceland | western region | alexandrium ostenfeldii | species | 4 | 0 |
| ireland | | alexandrium tamarense | species | 1 | 0 |
| italy | | alexandrium catenella | species | 2 | 0 |
| italy | | alexandrium minutum | species | 12 | 0 |
| italy | | alexandrium pseudogoniaulax | species | 1 | 0 |
| italy | | alexandrium sp. tamutum | species | 9 | 0 |
| italy | | alexandrium tamarense | species | 9 | 0 |
| italy | | alexandrium taylori | species | 6 | 0 |
| italy | campania region | alexandrium andersonii | species | 16 | 0 |
| italy | campania region | alexandrium tamarense species complex group ii | species | 3 | 0 |
| italy | sardinia autonomous region | alexandrium catenella | species | 1 | 0 |
| italy | sardinia autonomous region | alexandrium minutum | species | 2 | 0 |
| italy | sardinia autonomous region | alexandrium tamarense | species | 1 | 0 |
| italy | sicily autonomous region | alexandrium margalefii | species | 1 | 0 |
| italy | sicily autonomous region | alexandrium minutum | species | 13 | 0 |
| italy | sicily autonomous region | alexandrium taylori | species | 7 | 0 |
| japan | | alexandrium affine | species | 2 | 0 |
| japan | | alexandrium andersonii | species | 1 | 0 |
| japan | | alexandrium catenella | species | 9 | 0 |
| japan | | alexandrium fraterculum | species | 1 | 0 |
| japan | | alexandrium hiranoi | species | 3 | 0 |
| japan | | alexandrium insuetum | species | 3 | 0 |
| japan | | alexandrium minutum | species | 1 | 0 |
| japan | | alexandrium ostenfeldii | species | 17 | 0 |
| japan | | alexandrium pacificum | species | 3 | 0 |
| japan | | alexandrium pseudogoniaulax | species | 4 | 0 |
| japan | | alexandrium tamarense | species | 15 | 0 |
| japan | | alexandrium tamiyavanichi | species | 28 | 0 |
| japan | | alexandrium taylori | species | 1 | 0 |
| japan | hiroshima prefecture | alexandrium tamarense | species | 17 | 4 |
| japan | hiroshima prefecture | alexandrium tamiyavanichi | species | 1 | 0 |
| japan | hokkaido prefecture | alexandrium affine | species | 1 | 0 |
| japan | hokkaido prefecture | alexandrium ostenfeldii | species | 2 | 0 |
| japan | kagawa prefecture | alexandrium affine | species | 2 | 0 |
| japan | kagawa prefecture | alexandrium catenella | species | 2 | 0 |
| japan | kagawa prefecture | alexandrium pseudogoniaulax | species | 2 | 0 |
| japan | kagoshima prefecture | alexandrium catenella | species | 1 | 0 |
| japan | kagoshima prefecture | alexandrium tamarense | species | 1 | 0 |
| japan | kochi prefecture | alexandrium leei | species | 1 | 0 |
| japan | kumamoto prefecture | alexandrium catenella | species | 1 | 0 |
| japan | mie prefecture | alexandrium catenella | species | 3 | 0 |
| japan | oita prefecture | alexandrium sp. cell-1 | species | 1 | 0 |
| japan | oita prefecture | alexandrium sp. cell-2 | species | 1 | 0 |
| japan | oita prefecture | alexandrium sp. cell-3 | species | 1 | 0 |
| japan | oita prefecture | alexandrium sp. cell-4 | species | 1 | 0 |
| japan | oita prefecture | alexandrium sp. cell-5 | species | 1 | 0 |
| japan | oita prefecture | alexandrium sp. cell-6 | species | 1 | 0 |
| japan | oita prefecture | alexandrium sp. cell-7 | species | 1 | 0 |
| japan | oita prefecture | alexandrium sp. cell-8 | species | 1 | 0 |
| japan | okinawa prefecture | alexandrium taylori | species | 5 | 0 |
| japan | osaka prefecture | alexandrium affine | species | 3 | 0 |
| japan | osaka prefecture | alexandrium catenella | species | 1 | 0 |
| japan | tokushima prefecture | alexandrium catenella | species | 3 | 0 |
| japan | tottori prefecture | alexandrium catenella | species | 6 | 0 |
| japan | yamaguchi prefecture | alexandrium tamiyavanichi | species | 1 | 0 |
| malaysia | pahang | alexandrium tamiyavanichi | species | 3 | 0 |
| malaysia | sarawak | alexandrium tamiyavanichi | species | 1 | 0 |
| mexico | | alexandrium affine | species | 1 | 0 |
| mexico | | alexandrium margalefii | species | 2 | 0 |
| new zealand | | alexandrium concavum | species | 1 | 0 |
| new zealand | | alexandrium minutum | species | 1 | 0 |
| new zealand | | alexandrium ostenfeldii | species | 7 | 0 |
| new zealand | | alexandrium pseudogoniaulax | species | 1 | 0 |
| new zealand | | alexandrium tamarense | species | 1 | 0 |
| norway | | alexandrium ostenfeldii | species | 1 | 0 |
| norway | oslo county | alexandrium ostenfeldii | species | 3 | 0 |
| peru | callao region | alexandrium peruvianum | species | 2 | 0 |
| poland | | alexandrium sp. ccnp 4101 | species | 1 | 0 |
| poland | | alexandrium sp. ccnp 4102 | species | 1 | 0 |
| portugal | | alexandrium lusitanicum | species | 4 | 0 |
| portugal | | alexandrium minutum | species | 1 | 0 |
| singapore | | alexandrium leei | species | 1 | 0 |
| singapore | | alexandrium tamarense species complex group iv | species | 3 | 0 |
| south africa | the western cape province | alexandrium cf. catenella | species | 1 | 0 |
| south africa | the western cape province | alexandrium minutum | species | 3 | 0 |
| south korea | | alexandrium catenella | species | 18 | 0 |
| south korea | | alexandrium fundyense | species | 3 | 0 |
| south korea | | alexandrium pacificum | species | 5 | 0 |
| south korea | | alexandrium sp. cs-300/01 | species | 1 | 0 |
| south korea | | alexandrium tamarense | species | 9 | 0 |
| south korea | busan city | alexandrium catenella | species | 15 | 0 |
| south korea | busan city | alexandrium fraterculum | species | 5 | 0 |
| south korea | south gyeongsang province | alexandrium fraterculum | species | 3 | 0 |
| south korea | south gyeongsang province | alexandrium tamarense | species | 19 | 0 |
| south korea | south jeolla province | alexandrium catenella | species | 511 | 0 |
| south korea | south jeolla province | alexandrium sp. gd1590bp7 | species | 1 | 0 |
| south korea | ulsan city | alexandrium tamarense | species | 14 | 0 |
| spain | | alexandrium affine | species | 2 | 0 |
| spain | | alexandrium catenella | species | 4 | 0 |
| spain | | alexandrium minutum | species | 2 | 0 |
| spain | | alexandrium taylori | species | 1 | 0 |
| spain | catalonia | alexandrium catenella | species | 52 | 0 |
| spain | galicia | alexandrium affine | species | 6 | 0 |
| spain | galicia | alexandrium minutum | species | 2 | 0 |
| spain | galicia | alexandrium tamarense | species | 1 | 0 |
| sweden | gotland | alexandrium ostenfeldii | species | 6 | 0 |
| sweden | kalmar | alexandrium ostenfeldii | species | 5 | 0 |
| taiwan | | alexandrium minutum | species | 0 | 5 |
| tunisia | | alexandrium minutum | species | 3 | 0 |
| tunisia | bizerte governorate | alexandrium pacificum | species | 1 | 0 |
| tunisia | bizerte governorate | alexandrium pseudogoniaulax | species | 1 | 0 |
| united kingdom | | alexandrium minutum | species | 2 | 0 |
| united kingdom | | alexandrium tamarense | species | 22 | 0 |
| united kingdom | england | alexandrium minutum | species | 88 | 0 |
| united kingdom | england | alexandrium ostenfeldii | species | 2 | 0 |
| united kingdom | england | alexandrium tamarense | species | 13 | 0 |
| united kingdom | england | alexandrium tamarense species complex group iii | species | 8 | 0 |
| united kingdom | scotland | alexandrium ostenfeldii | species | 4 | 0 |
| united kingdom | scotland | alexandrium sp. ccap1119/14 | species | 1 | 0 |
| united kingdom | scotland | alexandrium tamarense | species | 21 | 0 |
| united states | | alexandrium fundyense | species | 1 | 0 |
| united states | | alexandrium ostenfeldii | species | 2 | 0 |
| united states | california | alexandrium catenella | species | 1 | 0 |
| united states | california | alexandrium tamarense species complex group i | species | 11 | 0 |
| united states | connecticut | alexandrium catenella | species | 1 | 0 |
| united states | maine | alexandrium cf. fundyense | species | 3 | 0 |
| united states | maine | alexandrium fundyense | species | 3 | 0 |
| united states | maine | alexandrium ostenfeldii | species | 10 | 0 |
| united states | maine | alexandrium sp. ccmp2080 | species | 1 | 0 |
| united states | maine | alexandrium sp. ccmp2725 | species | 1 | 0 |
| united states | maine | alexandrium tamarense species complex group i | species | 28 | 0 |
| united states | massachusetts | alexandrium andersonii | species | 2 | 0 |
| united states | massachusetts | alexandrium fundyense | species | 6 | 0 |
| united states | massachusetts | alexandrium sp. ccmp2722 | species | 1 | 0 |
| united states | massachusetts | alexandrium tamarense | species | 4 | 0 |
| united states | new hampshire | alexandrium fundyense | species | 2 | 0 |
| united states | new york | alexandrium tamarense | species | 3 | 0 |
| united states | north carolina | alexandrium ostenfeldii | species | 5 | 0 |
| united states | rhode island | alexandrium catenella | species | 4 | 0 |
| united states | rhode island | alexandrium fundyense | species | 6 | 0 |
| united states | washington | alexandrium catenella | species | 1 | 0 |
| united states | washington | alexandrium cf. catenella | species | 1 | 0 |
| united states | washington | alexandrium sp. ccmp1909 | species | 1 | 0 |
| united states | washington | alexandrium tamarense species complex group i | species | 22 | 0 |
| vietnam | | alexandrium affine | species | 1 | 0 |
| vietnam | hai phong city | alexandrium affine | species | 2 | 0 |