| Lophius(noun, creature, geohistory, lutetian) |
| Marsupial(noun, creature, geohistory, paleocene) |
| Megabat(noun, creature, appearance, eocene, geogistory) |
| Mercenaria(noun, creature, appearance, eocene, geogistory) |
| Metacarcinus(noun, creature, appearance, eocene, geogistory) |
| Microbiotheria(noun, creature, geohistory, paleocene) |
| Microbiotheriidae(noun, creature, geohistory, paleocene) |
| Mongoose(noun, creature, appearance, eocene, geogistory) |
| Mousebir(noun, creature, geohistory, paleocene) |
| Muscicapoidea(noun, creature, appearance, eocene, geogistory) |
| Nandiniidae(noun, creature, geohistory, lutetian) |
| Nebrius(noun, creature, geohistory, paleocene) |
| Nebrius ferrugineus(expression, creature, geohistory, paleocene) |
| Necturus(noun, creature, geohistory, paleocene) |
| Nephrops(noun, creature, appearance, eocene, geogistory) |
| Notoplax(noun, creature, appearance, eocene, geogistory) |
| Notoptera(noun, creature, geohistory, ypresian) |
| Odd-toed ungulate(expression, creature, geohistory, ypresian) |
| Old World monkey(expression, creature, appearance, eocene, geogistory) |
| Oregonia(noun, creature, appearance, eocene, geogistory) |