Kannemeyeria
Kanuites
Kaolishania
Kaprosuchus
Karavankina
Keichousaurus
Kentrosaurus
Kimberella
Kritosaurus
Kronosaurus
Kuehneosaurus
Labidosaurus
Lagosuchus
Lambeosaurus
Lamprocyclas
Lancastria
Leaellynasaura
Lebachia
Lepidosteus
Leptictidium
Leptoceratops
Lesothosaurus
Lewesiceras
Libanobythus
Lingulella
Liopleurodon
Livistonia
Lomatopteris
Longisquama
Lophosoria
Lourinhasaurus
Loxodonta
Luangwa
Lufengosaurus
Lyriaspis
Lystrosaurus
Lytodiscoides
Machairodus
Maclurites
Macrauchenia
Macromesodon
Macroplata
Maiasaura
Majungatholus
Malawisaurus
Mallotus
Mamenchisaurus
Mammut
Mammuthus
Mantelliceras
Marrella
Massospondylus
Mastodon
Mastodonsaurus
Mauisaurus
Mayeria
Mcnamaraspis
Mediterraneatrigonia
Megacerops
Megalania
Megalapis
Megaloceros
Megalonyx
Megalosaurus
Meganeura
Megantereon
Megaraptor
Megatherium
Megazostrodon
Mei
Meiolania
Mekosuchus
Melanorosaurus
Menardella
Mene
Merychippus
Mesadactylus
Mesodon
Mesonyx
Mesopithecus
Mesosaurus
Mestognathus
Metamynodon
Metasequoia
Metoposaurus
Metriorhynchus
Micreschara
Microceratodus
Microceratops
Microraptor
Microvenator
Minmi
Miohippus
Mixosaurus
Moa
Moanasaurus
Moeritherium
Mongolemys
Mongolotherium
Monoclonius
Monocyathus
Monolophosaurus
Mononykus
Montanoceratops
Morganucodon
Mosasaurus
Moschops
Muraenosaurus
Mussasaurus
Muttaburrasaurus
Muzquizopteryx
Myliobatis
Mylodon
Mysteroceras
Nanotyrannus
Naosaurus
Nassa
Natunaornis
Nautiloid
Neithia
Nematonotus
Neogloboquadrina
Neovenator
Neseuretus
Nesodon
Neuropteris
Neusticosaurus
Ninjemys
Nodosaurus
Nomingia
Nostoceras
Nothosaurus
Nothrotheriops
Notofagus
Numidopleura
Nyctosaurus