Taxa beginning with M
332 names, each with a page of its own for what the Paleobiology Database records about it. The list is what this site has looked up and cached, not everything the fossil record holds.
- Macgeea
- Machairodus
- Maclurina manitobensis
- Maclurites
- Maclurites magnus
- Macoma
- Macoma (Macoma) balthica
- Macoma (Macoma) calcarea
- Macoma (Psammacoma) arctata
- Macoma nasuta
- Macrocallista
- Macrocallista maculata
- Macrocephalites
- Macrochlamis magnolia
- Macrocoelia llandeiloensis
- Macronotella
- Macropus goliah
- Macrorhizodus praecursor
- Macrostylocrinus
- Mactra
- Mactromeris albaria
- Mactromya
- Mactromya cardioides
- Madracis decactis
- Mafangscolex sinensis
- Magas chitoniformis
- Magasella neozelandica
- Magdalenabradys confusum
- Magniplicatina magniplica
- Makoiamya cotterallae
- Malacostraca
- Maladioidella doylei
- Malea camura
- Malea ringens
- Malletia
- Mammalia
- Mammites nodosoides
- Mammut
- Mammut americanum
- Mammut borsoni
- Mammut pacificus
- Mammuthus
- Mammuthus columbi
- Mammuthus meridionalis
- Mammuthus primigenius
- Mammuthus trogontherii
- Manicina areolata
- Manitoulinoceras
- Mantelliceras mantelli
- Mantelliceras saxbii
- Manticoceras
- Manticoceras cordatum
- Manticoceras lamed
- Maorirhynchia nuggetensis
- Maorites densicostatus
- Margarosmilia
- Marginalosia kalikotei
- Marginatia
- Marginella
- Marginella maoensis
- Marginifera
- Marginifera (Marginifera) ornata
- Marginifera (Marginifera) typica
- Mariacolpus plebeia
- Marmota
- Marrolithus
- Marsupialia
- Martelites
- Martes
- Martinia
- Martinia rhomboidalis
- Martinia semiplana
- Martinia warthi
- Martiniopsis subpentagonalis
- Masaraella pandora
- Massospondylus
- Mastigobolbina
- Mathilda
- Meandrina meandrites
- Mecaster
- Mecaster batnensis
- Mecaster fourneli
- Mediospirifer
- Mediospirifer audaculus
- Meekella
- Meekella attenuata
- Meekella calathica
- Meekella hessensis
- Meekella kueichowensis
- Meekella skenoides
- Meekella striatocostata
- Meekoceras
- Meekoceras gracilitatis
- Meekospira
- Meekospira peracuta
- Megacricetodon
- Megacricetodon minor
- Megalaspides
- Megaloceros
- Megalonyx
- Megalonyx jeffersonii
- Megaloolithus siruguei
- Megamyonia arethusa
- Megamyonia nitens
- Megangulus bodegensis
- Megapronorites sakmarensis
- Megascapheus bottae
- Megasteges nepalensis
- Megastraea undosa
- Megastrophia
- Megasurcula carpenteriana
- Megatherium americanum
- Megatylopus
- Megistaspis
- Megousia
- Megousia auriculata
- Megousia waageniana
- Mehlina
- Meifodia
- Meifodia prima
- Melanella
- Melanopsis
- Melchiorites
- Meleagrinella
- Meleagrinella echinata
- Meleagrinella substriata
- Meleagris gallopavo
- Meles meles
- Meliceritites
- Melongena
- Melongena consors
- Melvius
- Melvius thomasi
- Mendacella
- Mendacella mullockiensis
- Menelikia lyrocera
- Meniscoessus robustus
- Meniscotherium chamense
- Mentzelia mentzeli
- Menuites
- Mephitis mephitis
- Mercenaria
- Mercenaria campechiensis
- Mercenaria mercenaria
- Merista
- Meristella
- Meristina
- Meristodonoides montanensis
- Merocrinus
- Merychyus
- Merycodontinae
- Merycoidodon culbertsonii
- Mesalia
- Mesalia alabamiensis
- Mesalia claibornensis
- Mesalia martinezensis
- Mesalia vetusta
- Mesenteripora
- Mesocallista
- Mesodma
- Mesodma formosa
- Mesodma thompsoni
- Mesodouvillina
- Mesoeucrocodylia
- Mesofavosites
- Mesoleptostrophia
- Mesoleptostrophia filosa
- Mesolygaeus laiyangensis
- Mesopuzosia
- Mesosaccella
- Mesotrypa
- Metaderoceras
- Metaderoceras talkeetnaense
- Metanoiamys agorus
- Metapolygnathus
- Metaspyroceras
- Metaxytherium
- Metaxytherium medium
- Metoicoceras geslinianum
- Metopolichas
- Metoposauridae
- Metridiochoerus
- Metridiochoerus andrewsi
- Metridiochoerus compactus
- Metriolepis
- Mexacanthina lugubris
- Mexicardia procera
- Mexicella mexicana
- Mexicoceras guadalupense
- Miacidae
- Miacis
- Miacis exiguus
- Michela trabeatoides
- Michelinia
- Michelinoceras
- Micrabacia
- Micraster
- Micrina etheridgei
- Microcallista (Costacallista) conradiana
- Microcheilinella
- Microcheilinella perexilis
- Microcheilinella rectodorsata
- Microcheilinella shicheni
- Microcheilinella venusta
- Microconchus valvatus
- Microderoceras (Eoderoceras) birchiades
- Microdictyon
- Microdrillia
- Microdyromys
- Micromitra
- Microparamys
- Microparamys minutus
- Microsolena
- Microsolena agariciformis
- Microsphaeridiorhynchus nucula
- Microsyopidae
- Microsyops angustidens
- Microsyops elegans
- Microsyops latidens
- Microtomarctus conferta
- Microtus
- Microtus arvalis
- Microtus pennsylvanicus
- Microzarkodina
- Mikrotia
- Millericrinus
- Milovanovicia
- Mimella
- Mimella vulgaris
- Mimomys
- Minilya
- Minilya binodata
- Miniochoerus affinis
- Minispongia constricta
- Minodentalium herculeum
- Miohippus
- Misikella hernsteini
- Misikella posthernsteini
- Misszhouia longicaudata
- Mitra
- Mitra (Tiara)
- Mitrella
- Mitrella gausapata
- Mitrella tuberosa
- Mnestia
- Modiella
- Modiolopsis
- Modiolus
- Modiolus (Modiolus) imbricatus
- Modiolus (Modiolus) scalprum
- Modiolus bipartitus
- Modiolus giganteus
- Modiomorpha
- Modiomorpha concentrica
- Modiomorpha mytiloides
- Modiomorphidae
- Modocia
- Mollusca
- Mongolitubulus
- Monoceratina
- Monoclimacis
- Monograptus
- Monograptus priodon
- Monograptus uniformis
- Monophyllites wengensis
- Monotis (Entomonotis) subcircularis
- Monotrypa
- Monsardithyris ventricosa
- Montastraea
- Montastraea cylindrica
- Montastraea endothecata
- Montastraea faveolata
- Montastrea cavernosa
- Monticlarella
- Monticulifera sinensis
- Monticulipora
- Montipora
- Montlivaltia
- Mortoniceras (Subschloenbachia) perinflatum
- Morychus viridis
- Mosasauridae
- Mosasaurus hoffmannii
- Mucronaspis
- Mucronaspis (Songxites) mucronatus
- Mucrospirifer
- Mucrospirifer mucronatus
- Mulinia congesta
- Mulinia lateralis
- Multicostella
- Multicostella platys
- Multisolenia
- Multisolenia tortuosa
- Multituberculata
- Muracypraea henekeni
- Murchisonioidea
- Murex
- Mus
- Mustelidae
- Mutationella
- Mya (Arenomya) arenaria
- Mya (Mya) truncata
- Myacites (Pleuromya) subcompressa
- Myalina
- Myalina (Orthomyalina) subquadrata
- Mylagaulidae
- Myledaphus
- Myledaphus bipartitus
- Myliobatis
- Myoconcha
- Myoconcha decorata
- Myocricetodon
- Myodes
- Myonia (Myomedia) carinata
- Myophorella
- Myophoria
- Myophoria vulgaris
- Myophoriopis
- Myotis
- Myrtaea (Myrtaea) curta
- Myrtea
- Mysidioptera
- Mysticeti
- Mystriosuchinae
- Mystriosuchini
- Mytilarca
- Mytiloides
- Mytiloides labiatus
- Mytiloides mytiloides
- Mytiloides stantoni
- Mytilus
- Mytilus californianus
- Mytilus edulis