| marmota | Yes | | | rodents | genus | 9992 | click here |
| mastocarpus stellatus | Yes | species | eukaryota | plants | species | 29227 | click here |
| matteuccia struthiopteris | Yes | species | eukaryota | plants | species | 3277 | click here |
| medicago | Yes | | | plants | genus | 3877 | click here |
| medicago sativa | Yes | species | eukaryota | plants | species | 3879 | click here |
| megachile rotundata | Yes | species | eukaryota | invertebrates | species | 143995 | click here |
| meleagris gallopavo | Yes | species | eukaryota | vertebrates | species | 9103 | click here |
| melia azedarach | Yes | species | eukaryota | plants | species | 155640 | click here |
| melia azedarach var. toosendan | Yes | varietas | eukaryota | plants | varietas | 71608 | click here |
| melia volkensii | Yes | species | | | species | 643111 | click here |
| melianthus comosus | Yes | species | eukaryota | plants | species | 377274 | click here |
| melipona subnitida | Yes | species | eukaryota | invertebrates | species | 300637 | click here |
| melithaea | Yes | | | invertebrates | genus | 156533 | click here |
| meloidae | Yes | | | invertebrates | family | 34672 | click here |
| membranipora membranacea | Yes | species | eukaryota | invertebrates | species | 95170 | click here |
| mentha x piperita | Yes | subspecies | eukaryota | plants | species | 34256 | click here |
| meretrix lusoria | Yes | species | eukaryota | invertebrates | species | 74491 | click here |
| mesembryanthemum crystallinum | Yes | species | eukaryota | plants | species | 3544 | click here |
| metapenaeus affinis | Yes | species | eukaryota | invertebrates | species | 228858 | click here |
| metasequoia glyptostroboides | Yes | species | eukaryota | plants | species | 3371 | click here |
| micrandra spruceana | Yes | species | eukaryota | plants | species | 398633 | click here |
| micromesistius poutassou | Yes | species | eukaryota | vertebrates | species | 81636 | click here |
| millettia pinnata | Yes | species | eukaryota | plants | species | 56065 | click here |
| miscanthus x giganteus | Yes | subspecies | eukaryota | plants | species | 183674 | click here |
| mitrephora wangii | Yes | species | | | species | 1679251 | click here |
| mollusca | Yes | | | invertebrates | phylum | 6447 | click here |
| monanchora unguiculata | Yes | species | | | species | 1346142 | click here |
| monarda citriodora | Yes | species | eukaryota | plants | species | 182379 | click here |
| monochoria vaginalis | Yes | species | eukaryota | plants | species | 44972 | click here |
| moquiniastrum polymorphum | Yes | species | eukaryota | plants | species | 130259 | click here |
| morinda citrifolia | Yes | species | eukaryota | plants | species | 43522 | click here |
| moringa | Yes | | | plants | genus | 3734 | click here |
| moringa oleifera | Yes | species | eukaryota | plants | species | 3735 | click here |
| morus rubra | Yes | species | eukaryota | plants | species | 32202 | click here |
| mucuna pruriens | Yes | species | eukaryota | plants | species | 157652 | click here |
| murraya exotica | Yes | species | eukaryota | plants | species | 159059 | click here |
| murraya koenigii | Yes | species | eukaryota | plants | species | 159030 | click here |
| musa | Yes | | | plants | genus | 4640 | click here |
| musa abb group | Yes | no rank | eukaryota | plants | no rank | 214693 | click here |
| musa acuminata | Yes | species | eukaryota | plants | species | 4641 | click here |
| musa acuminata subsp. microcarpa | Yes | subspecies | eukaryota | plants | subspecies | 228179 | click here |
| musa balbisiana | Yes | species | eukaryota | plants | species | 52838 | click here |
| musa balbisiana var. balbisiana | Yes | varietas | eukaryota | plants | varietas | 482283 | click here |
| musa itinerans | Yes | species | eukaryota | plants | species | 574487 | click here |
| musa sp. | Yes | no rank | eukaryota | plants | species | 46838 | click here |
| musa velutina | Yes | species | eukaryota | plants | species | 228181 | click here |
| musa violascens | Yes | species | eukaryota | plants | species | 574499 | click here |
| musa x paradisiaca | Yes | subspecies | eukaryota | plants | species | 89151 | click here |
| mustela putorius furo | Yes | subspecies | eukaryota | mammals | subspecies | 9669 | click here |
| mycale grandis | Yes | species | eukaryota | invertebrates | species | 564368 | click here |
| myotis dasycneme | Yes | species | eukaryota | mammals | species | 159324 | click here |
| myotis daubentonii | Yes | species | eukaryota | mammals | species | 98922 | click here |
| myotis emarginatus | Yes | species | eukaryota | mammals | species | 109480 | click here |
| myotis myotis | Yes | species | eukaryota | mammals | species | 51298 | click here |
| myotis mystacinus | Yes | species | eukaryota | mammals | species | 109479 | click here |
| myotis nattereri | Yes | species | eukaryota | mammals | species | 109481 | click here |
| myrceugenia ovata | Yes | species | eukaryota | plants | species | 375247 | click here |
| myricaria laxiflora | Yes | species | eukaryota | plants | species | 223224 | click here |
| myrmeciza exsul | Yes | species | eukaryota | vertebrates | species | 413254 | click here |
| myrtaceae | Yes | | | plants | family | 3931 | click here |
| myrtillocactus geometrizans | Yes | species | eukaryota | plants | species | 336127 | click here |
| mytilus sp. | Yes | no rank | eukaryota | invertebrates | species | 61855 | click here |
| myzus persicae | Yes | species | eukaryota | invertebrates | species | 13164 | click here |
| narcissus | Yes | | | plants | genus | 4697 | click here |
| nasutitermes corniger | Yes | species | eukaryota | invertebrates | species | 52233 | click here |
| nepeta crispa | Yes | species | eukaryota | plants | species | 213036 | click here |
| nephrolepis cordifolia | Yes | species | eukaryota | plants | species | 32153 | click here |
| nerium oleander | Yes | species | eukaryota | plants | species | 63479 | click here |
| nicotiana benthamiana | Yes | species | eukaryota | plants | species | 4100 | click here |
| nicotiana occidentalis | Yes | species | eukaryota | plants | species | 200313 | click here |
| nicotiana rosulata | Yes | species | eukaryota | plants | species | 200309 | click here |
| nicotiana simulans | Yes | species | eukaryota | plants | species | 118709 | click here |
| nicotiana tabacum | Yes | species | eukaryota | plants | species | 4097 | click here |
| nilaparvata lugens | Yes | species | eukaryota | invertebrates | species | 108931 | click here |
| nitraria sphaerocarpa | Yes | species | eukaryota | plants | species | 357930 | click here |
| nitraria tangutorum | Yes | species | eukaryota | plants | species | 357929 | click here |
| noctuidae | Yes | | | invertebrates | family | 7100 | click here |
| nothapodytes nimmoniana | Yes | species | eukaryota | plants | species | 159386 | click here |
| nothofagus antarctica | Yes | species | eukaryota | plants | species | 28933 | click here |
| ocimum basilicum | Yes | species | eukaryota | plants | species | 39350 | click here |
| ocimum tenuiflorum | Yes | species | eukaryota | plants | species | 204149 | click here |
| octopus | Yes | | | invertebrates | genus | 6643 | click here |
| odontotermes javanicus | Yes | species | eukaryota | invertebrates | species | 201590 | click here |
| odontotermes longignathus | Yes | species | eukaryota | invertebrates | species | 144741 | click here |
| odontotermes obesus | Yes | species | eukaryota | invertebrates | species | 483037 | click here |
| oenanthe javanica | Yes | species | eukaryota | plants | species | 49556 | click here |
| oenothera picensis | Yes | species | eukaryota | plants | species | 3946 | click here |
| olea | Yes | | | plants | genus | 4145 | click here |
| olea europaea | Yes | species | eukaryota | plants | species | 4146 | click here |
| oleandra articulata | Yes | species | eukaryota | plants | species | 449867 | click here |
| oncidium | Yes | | | plants | genus | 45173 | click here |
| oncorhynchus mykiss | Yes | species | eukaryota | vertebrates | species | 8022 | click here |
| opegrapha medusulina | Yes | species | | | species | 1016806 | click here |
| ophiocordyceps barnesii | Yes | species | eukaryota | plants | species | 261238 | click here |
| ophiocordyceps crinalis | Yes | species | eukaryota | plants | species | 438476 | click here |
| ophiocordyceps sinensis | Yes | species | eukaryota | plants | species | 72228 | click here |
| ophiopogon japonicus | Yes | species | eukaryota | plants | species | 100506 | click here |
| ophrida xanthospilota | Yes | species | eukaryota | invertebrates | species | 301078 | click here |
| opuntia albicarpa | Yes | species | eukaryota | plants | species | 393609 | click here |
| opuntia dillenii | Yes | species | eukaryota | plants | species | 308223 | click here |