304 genera are assigned to the class MAMMALIA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| CARNIVORA | Aivukus | T | Mi-u | T | Mi-u |
| CARNIVORA | Alachtherium | T | Plio-u | T | Plio-u |
| CARNIVORA | Allodesmus | T | Mi-l | T | Mi-m |
| CARNIVORA | Arctocephalus | Q | Plei | R | |
| CARNIVORA | Atopotarus | T | Mi | Q | Plei |
| CARNIVORA | Callophoca | T | Plio | T | Plio |
| CARNIVORA | Callorhinus | T | Plio | R | |
| CARNIVORA | Cystophora | Q | Plei | R | |
| CARNIVORA | Desmatophoca | T | Mi-l-u | T | Mi-m |
| CARNIVORA | Dusignathus | T | Mi-u-u | T | Mi-u-u |
| CARNIVORA | Enaliarctos | T | Ol-u | T | Mi-l-u |
| CARNIVORA | Enhydriodon | T | Mi-u | R | |
| CARNIVORA | Enhydritherium | T | Mi-u | T | Plio |
| CARNIVORA | Eumetopias | T | Plio-u | R | |
| CARNIVORA | Gryphoca | T | Plio-u | T | Plio-u |
| CARNIVORA | Imagotaria | T | Mi-m | T | Mi-u |
| CARNIVORA | Kamtschatarctos | T | Mi-m | T | Mi-m |
| CARNIVORA | Leptophoca | T | Mi-m | T | Mi-m |
| CARNIVORA | Mesotaria | T | Plio-u | T | Plio-u |
| CARNIVORA | Monachiopsis | T | Mi-m | T | Mi-m |
| CARNIVORA | Monachus | T | Plio-u | R | |
| CARNIVORA | Monotherium | T | Mi-u | T | Mi-u |
| CARNIVORA | Necromites | T | Mi | T | Mi |
| CARNIVORA | Neophoca | Q | Plei | R | |
| CARNIVORA | Neotherium | T | Mi-m | T | Mi-m |
| CARNIVORA | Odobenus | T | Plio | R | |
| CARNIVORA | Otaria | Q | Plei | R | |
| CARNIVORA | Palaeophoca | T | Plio-u | T | Plio-u |
| CARNIVORA | Palmidophoca | T | Mi-m | T | Mi-m |
| CARNIVORA | Pelagiarctos | T | Mi-m | T | Mi-m |
| CARNIVORA | Phoca | T | Mi-m | R | |
| CARNIVORA | Phocanella | T | Plio-u | T | Plio-u |
| CARNIVORA | Pinnarctidion | T | Mi-l | T | Mi-l |
| CARNIVORA | Pithanotaria | T | Mi-m | T | Mi-u |
| CARNIVORA | Platyphoca | T | Plio-u | T | Plio-u |
| CARNIVORA | Pliopedia | T | Mi-u | T | Mi-u |
| CARNIVORA | Pontolis | T | Mi-u | T | Mi-u |
| CARNIVORA | Pontophoca | T | Mi-m | T | Mi-m |
| CARNIVORA | Praepusa | T | Mi-m | T | Mi-m |
| CARNIVORA | Pristiphoca | T | Mi-m | Q | Plei-l |
| CARNIVORA | Properiptychus | T | Mi-m | T | Mi-m |
| CARNIVORA | Prophoca | T | Mi-u | T | Mi-u |
| CARNIVORA | Prorosmarus | T | Mi-u | T | Mi-u |
| CARNIVORA | Prototaria | T | Mi-m | T | Mi-m |
| CARNIVORA | Pteronarctos | T | Mi-l-u | T | Mi-l-u |
| CARNIVORA | Thalassoleon | T | Mi-u-u | T | Plio |
| CARNIVORA | Trichechodon | T | Plio | Q | Plei |
| CARNIVORA | Valenictis | T | Plio-l | T | Plio-l |
| CARNIVORA | Zalophus | Q | Plei | R | |
| CETACEA | Acrodelphis | T | Mi-l | T | Mi-u |
| CETACEA | Aetiocetus | T | Ol-u | T | Ol-u |
| CETACEA | Agabelus | T | Mi-m | T | Mi-m |
| CETACEA | Aglaocetus | T | Mi-l | T | Mi-l |
| CETACEA | Agorophius | T | Ol-u | T | Ol-u |
| CETACEA | Agriocetus | T | Ol-u | T | Ol-u |
| CETACEA | Albireo | T | Mi-u | T | Mi-u |
| CETACEA | Ambulocetus | T | Eo-m | T | Eo-m |
| CETACEA | Amphicetus | T | Plio-l | T | Plio-l |
| CETACEA | Anacharsis | T | Mi-u | T | Mi-u |
| CETACEA | Andrewsiphius | T | Eo-m-l | T | Eo-m-l |
| CETACEA | Anoplonassa | T | Mi-m | T | Mi-u |
| CETACEA | Apenophyseter | T | Mi-l | T | Mi-l |
| CETACEA | Araeodelphis | T | Mi-m | T | Mi-m |
| CETACEA | Archaeodelphis | T | Ol-u | T | Ol-u |
| CETACEA | Argyrocetus | T | Mi-l | T | Mi-l |
| CETACEA | Atocetus | T | Mi-m | T | Mi-m |
| CETACEA | Atropatenocetus | T | Ol-u | T | Ol-u |
| CETACEA | Auiophyseter | T | Mi-m | T | Mi-m |
| CETACEA | Aulocetus | T | Mi | T | Mi |
| CETACEA | Aulophyseter | T | Mi-m | T | Mi-m |
| CETACEA | Australithax | T | Mi-u | T | Mi-u |
| CETACEA | Australosqualodon | T | Ol-u | T | Ol-u |
| CETACEA | Balaena | T | Plio | R | |
| CETACEA | Balaenodon | T | Mi-u | T | Mi-u |
| CETACEA | Balaenoptera | T | Mi-u | R | |
| CETACEA | Balaenotus | T | Mi-u | T | Plio |
| CETACEA | Balaenula | T | Mi-u | T | Plio |
| CETACEA | Basilosaurus | T | Eo-m-u | T | Eo-u |
| CETACEA | Belemnoziphius | T | Mi-u | T | Mi-u |
| CETACEA | Belosphys | T | Mi-m | T | Mi-m |
| CETACEA | Berardiopsis | T | Plio-u | T | Plio-u |
| CETACEA | Brachydelphis | T | Mi-u | T | Mi-u |
| CETACEA | Burtinopsis | T | Mi-u | T | Mi-u |
| CETACEA | Cephalotropis | T | Plio | T | Plio |
| CETACEA | Ceterhinops | T | Mi-m | T | Mi-m |
| CETACEA | Cetorhynchus | T | Mi-m | T | Mi-u |
| CETACEA | Cetotheriomorphis | T | Mi-m | T | Mi-u |
| CETACEA | Cetotheriopsis | T | Ol-u | T | Mi-l |
| CETACEA | Cetotherium | T | Mi-u | T | Plio-l |
| CETACEA | Champsodelphis | T | Mi-l | T | Mi-m |
| CETACEA | Chonecetus | T | Ol-u | T | Ol-u |
| CETACEA | Choneziphius | T | Mi-u | T | Plio-u |
| CETACEA | Colophonodon | T | Mi-u | T | Mi-u |
| CETACEA | Cophocetus | T | Mi-m | T | Mi-m |
| CETACEA | Cyrtodelphis | T | Mi-l | T | Mi-u |
| CETACEA | Delphinapterus | T | Mi-m | R | |
| CETACEA | Delphinavus | T | Mi-l | T | Mi-u |
| CETACEA | Delphinodon | T | Mi-m | T | Mi-m |
| CETACEA | Delphinopsis | T | Mi-u | T | Mi-u |
| CETACEA | Delphinus | T | Plio-l | R | |
| CETACEA | Denebola | T | Mi-u | T | Mi-u |
| CETACEA | Diaphorocetus | T | Mi-l | T | Mi-l |
| CETACEA | Dinoziphius | T | Mi-m | T | Mi-u |
| CETACEA | Diorocetus | T | Mi-m | T | Mi-m |
| CETACEA | Doliodelphis | T | Mi-l | T | Mi-l |
| CETACEA | Dorudon | T | Eo-m-u | T | Eo-u |
| CETACEA | Eboroziphius | T | Mi-u | T | Mi-u |
| CETACEA | Eocetus | T | Eo-m-u | T | Eo-u |
| CETACEA | Eoplatanista | T | Mi-l | T | Mi-l |
| CETACEA | Eosqualodon | T | Ol-u | T | Ol-u |
| CETACEA | Eschrichtius | T | Mi-m | R | |
| CETACEA | Eubalaena | Q | Plei | R | |
| CETACEA | Eucetotherium | T | Mi-m | T | Mi-u |
| CETACEA | Eurhinodelphis | T | Mi-m | T | Mi-u |
| CETACEA | Ferecetotherium | T | Ol-u | T | Ol-u |
| CETACEA | Gandakasia | T | Eo-m-l | T | Eo-m-l |
| CETACEA | Georgiacetus | T | Eo-m | T | Eo-m |
| CETACEA | Globicephala | Q | Plei | R | |
| CETACEA | Hadrodelphis | T | Mi-m | T | Mi-m |
| CETACEA | Haplocetus | T | Mi-u | T | Mi-u |
| CETACEA | Hemisyntrachelus | T | Plio | T | Plio |
| CETACEA | Herpetocetus | T | Mi-u | T | Mi-u |
| CETACEA | Heterocetus | T | Mi-m | T | Mi-u |
| CETACEA | Heterodelphis | T | Mi-m | T | Mi-u |
| CETACEA | Hoplocetus | T | Mi-m | T | Mi-m |
| CETACEA | Ichthyoletes | T | Eo-m-l | T | Eo-m-l |
| CETACEA | Idiocetus | T | Mi | T | Plio-u |
| CETACEA | Idiophyseter | T | Mi-m | T | Mi-m |
| CETACEA | Idiorophus | T | Mi-l | T | Mi-l |
| CETACEA | Imerocetus | T | Mi-u | T | Mi-u |
| CETACEA | Imerodelphis | T | Mi-u | T | Mi-u |
| CETACEA | Incacetus | T | Mi-m | T | Mi-m |
| CETACEA | Indocetus | T | Eo-m-l | T | Eo-m-l |
| CETACEA | Iniopsis | T | Ol-u | T | Mi-u |
| CETACEA | Isocetus | T | Mi-u | T | Mi-u |
| CETACEA | Ixacanthus | T | Mi-m | T | Mi-m |
| CETACEA | Kampholophus | T | Mi-m | T | Mi-m |
| CETACEA | Kekenodon | T | Ol-u | T | Ol-u |
| CETACEA | Kelloggia | T | Ol-u | T | Ol-u |
| CETACEA | Kentriodon | T | Mi-m | T | Mi-m |
| CETACEA | Kogia | T | Plio | R | |
| CETACEA | Kogiopsis | T | Plio-l | T | Plio-l |
| CETACEA | Lagenorhynchus | T | Plio | Q | Plei |
| CETACEA | Lamprolithax | T | Mi-m | T | Mi-m |
| CETACEA | Leptodelphis | T | Mi-m | T | Mi-m |
| CETACEA | Liolithax | T | Mi-m | T | Mi-u |
| CETACEA | Llanocetus | T | Eo-u | T | Eo-u |
| CETACEA | Lomacetus | T | Mi-u | T | Mi-u |
| CETACEA | Loncodelphis | T | Mi-u | T | Mi-u |
| CETACEA | Lophocetus | T | Mi-m | T | Mi-m |
| CETACEA | Loxolithax | T | Mi-m | T | Mi-m |
| CETACEA | Macrochirifer | T | Mi-u | T | Mi-u |
| CETACEA | Macrodelphinus | T | Mi-l | T | Mi-l |
| CETACEA | Mammalodon | T | Ol-u | T | Ol-u |
| CETACEA | Manicetus | T | Ol-l-u | T | Mi-l |
| CETACEA | Medoicinia | T | Mi-l-u | T | Mi-l-u |
| CETACEA | Megaptera | T | Plio-l | R | |
| CETACEA | Megapteropsis | T | Plio-l | T | Plio-l |
| CETACEA | Mesocetus | T | Mi-m | T | Mi-u |
| CETACEA | Mesoplodon | T | Mi-u | R | |
| CETACEA | Mesoteras | T | Mi-u | T | Mi-u |
| CETACEA | Metasqualodon | T | Ol-u | T | Ol-u |
| CETACEA | Metopocetus | T | Mi-u | T | Mi-u |
| CETACEA | Microcetus | T | Ol-u | T | Ol-u |
| CETACEA | Microphocaena | T | Mi-m | T | Mi-m |
| CETACEA | Microsqualodon | T | Mi-l | T | Mi-l |
| CETACEA | Microzeuglodon | T | Ol-u | T | Ol-u |
| CETACEA | Miodelphis | T | Mi-l | T | Mi-l |
| CETACEA | Miokogia | T | Mi-l | T | Mi-l |
| CETACEA | Mirocetus | T | Ol-u | T | Ol-u |
| CETACEA | Mixocetus | T | Mi-u | T | Mi-u |
| CETACEA | Monodon | Q | Plei | Q | Plei |
| CETACEA | Morenocetus | T | Mi-l | T | Mi-l |
| CETACEA | Nanisocetus | T | Mi-u | T | Mi-u |
| CETACEA | Nannocetus | T | Mi-u | T | Mi-u |
| CETACEA | Nannolithax | T | Mi-m | T | Mi-m |
| CETACEA | Neosqualodon | T | Mi-l | T | Mi-l |
| CETACEA | Ninoziphius | T | Plio | T | Plio |
| CETACEA | Notiocetus | T | Plio-l | T | Plio-l |
| CETACEA | Notocetus | T | Mi-l-u | T | Mi-l-u |
| CETACEA | Oedolithax | T | Mi-m | T | Mi-m |
| CETACEA | Oligodelphis | T | Ol-l-u | T | Ol-l-u |
| CETACEA | Ontocetus | T | Mi-m | T | Mi-u |
| CETACEA | Orcinus | T | Mi-u | R | |
| CETACEA | Orycterocetus | T | Mi-l | T | Mi-l |
| CETACEA | Pachycetus | T | Eo-m | T | Eo-m |
| CETACEA | Palaeobalaena | T | Mi-m | T | Mi-m |
| CETACEA | Palaeocetus | T | Mi-u | T | Mi-u |
| CETACEA | Palaeophocaena | T | Mi-u | T | Mi-u |
| CETACEA | Palaeoziphius | T | Mi-u | T | Mi-u |
| CETACEA | Pappocetus | T | Eo-m-l | T | Eo-m-l |
| CETACEA | Parapontoparia | T | Mi-u | T | Plio-u |
| CETACEA | Parasqualodon | T | Ol-u | T | Ol-u |
| CETACEA | Parietobalaena | T | Mi-u | T | Mi-u |
| CETACEA | Patriocetus | T | Ol-u | T | Ol-u |
| CETACEA | Pelocetus | T | Mi-m | T | Mi-m |
| CETACEA | Pelodelphis | T | Mi-m | T | Mi-m |
| CETACEA | Periplocetus | T | Mi-m | T | Mi-m |
| CETACEA | Phoberodon | T | Mi-l | T | Mi-l |
| CETACEA | Phocaena | T | Mi-u | R | |
| CETACEA | Phocaenopsis | T | Mi-l | T | Mi-l |
| CETACEA | Phocageneus | T | Mi-m | T | Mi-m |
| CETACEA | Phococetus | T | Ol-l | T | Mi-l-u |
| CETACEA | Physeter | T | Mi-l | R | |
| CETACEA | Physeterula | T | Mi-l | T | Plio |
| CETACEA | Physetodon | T | Plio-l | T | Plio-l |
| CETACEA | Pinocetus | T | Mi-m | T | Mi-m |
| CETACEA | Piscolithax | T | Mi-u | T | Plio-l |
| CETACEA | Pithanodelphis | T | Mi-u | T | Mi-u |
| CETACEA | Placoziphius | T | Mi-u | T | Mi-u |
| CETACEA | Platylithax | T | Mi-m | T | Mi-m |
| CETACEA | Platyosphys | T | Ol-l | T | Ol-l |
| CETACEA | Plesiocetopsis | T | Mi-u | T | Plio-l |
| CETACEA | Plesiocetus | T | Mi-l | T | Plio-l |
| CETACEA | Pliopontos | T | Plio-l | T | Plio-l |
| CETACEA | Pomatodelphis | T | Mi-m | T | Plio-l |
| CETACEA | Pontistes | T | Plio-l | T | Plio-l |
| CETACEA | Pontivaga | T | Plio-l | T | Plio-l |
| CETACEA | Pontogeneus | T | Eo-u | T | Eo-u |
| CETACEA | Potamodelphis | T | Mi-u | T | Mi-u |
| CETACEA | Praekogia | T | Mi-u | T | Mi-u |
| CETACEA | Prioinia | T | Mi-l | T | Mi-l |
| CETACEA | Prionodelphis | T | Plio-l | T | Plio-l |
| CETACEA | Priscophyseter | T | Mi-u | T | Mi-u |
| CETACEA | Procetus | T | Eo-m | T | Eo-m |
| CETACEA | Prophyseter | T | Mi-u | T | Mi-u |
| CETACEA | Proroziphius | T | Mi-u | T | Mi-u |
| CETACEA | Prosqualodon | T | Mi-l | T | Mi-l |
| CETACEA | Protobalaena | T | Plio-l | T | Plio-l |
| CETACEA | Protocetus | T | Eo-m-l | T | Eo-m-u |
| CETACEA | Protodelphinus | T | Mi-l | T | Mi-l |
| CETACEA | Protophocaena | T | Mi-u | T | Mi-u |
| CETACEA | Prozeuglodon | T | Eo-m-l | T | Eo-u |
| CETACEA | Pseudorca | Q | Plei-l | R | |
| CETACEA | Remingtonocetus | T | Eo-m-l | T | Eo-m-l |
| CETACEA | Rhabodosteus | T | Mi-m | T | Mi-m |
| CETACEA | Rhegnopsis | T | Mi-u | T | Plio |
| CETACEA | Rhytisodon | T | Mi-l | T | Mi-l |
| CETACEA | Rodhocetus | T | Eo-m | T | Eo-m |
| CETACEA | Sachalinocetus | T | Mi-l | T | Mi-l |
| CETACEA | Saghacetus | T | Eo-u | T | Eo-u |
| CETACEA | Salumniphocaena | T | Mi-u | T | Mi-u |
| CETACEA | Sarmatodelphis | T | Mi-m | T | Mi-m |
| CETACEA | Saurocetus | T | Ol-u | T | Mi-u |
| CETACEA | Schizodelphis | T | Mi-l | T | Mi-u |
| CETACEA | Siphonocetus | T | Mi-u | T | Mi-u |
| CETACEA | Sormatodelphis | T | Mi-u | T | Mi-u |
| CETACEA | Squalodelphis | T | Mi-l-u | T | Mi-l-u |
| CETACEA | Squalodon | T | Ol-u | T | Plio |
| CETACEA | Squaloziphius | T | Mi-l | T | Mi-l |
| CETACEA | Stenella | T | Mi-m | T | Plio |
| CETACEA | Steno | T | Plio-l | R | |
| CETACEA | Stenodelphis | Q | Plei | R | |
| CETACEA | Stereodelphis | T | Mi-m | T | Mi-m |
| CETACEA | Sulakocetus | T | Ol-u | T | Ol-u |
| CETACEA | Tangarasaurus | T | Mi-l | T | Mi-l |
| CETACEA | Thalassocetus | T | Mi-u | T | Mi-u |
| CETACEA | Tiphyocetus | T | Mi-m | T | Mi-m |
| CETACEA | Tretosphrys | T | Mi-m | T | Mi-m |
| CETACEA | Tretulias | T | Mi-u | T | Mi-u |
| CETACEA | Trirhizodon | T | Mi-l | T | Mi-m |
| CETACEA | Tursiops | T | Mi-m | R | |
| CETACEA | Ulias | T | Mi-u | T | Mi-u |
| CETACEA | Xenorophus | T | Ol-u | T | Ol-u |
| CETACEA | Ziphiodelphis | T | Mi-u | T | Mi-u |
| CETACEA | Ziphioides | T | Mi-m | T | Mi-m |
| CETACEA | Ziphirostrum | T | Mi-u | T | Mi-u |
| CETACEA | Ziphius | T | Plio-l | T | Plio-l |
| CETACEA | Zygorhiza | T | Eo-m-u | T | Eo-u |
| DESMOSTYLIA | Behemotops | T | Ol-u | T | Ol-u |
| DESMOSTYLIA | Cornwallius | T | Ol-u | T | Ol-u |
| DESMOSTYLIA | Desmostylus | T | Mi-l | T | Mi-u |
| DESMOSTYLIA | Paleoparadoxia | T | Mi-m | T | Mi-u |
| SIRENIA | Anisosiren | T | Eo-m-l | T | Eo-m-l |
| SIRENIA | Anomotherium | T | Ol-l-u | T | Ol-u |
| SIRENIA | Bharatisiren | T | Mi-l-l | T | Mi-l-l |
| SIRENIA | Caribosiren | T | Ol-l-u | T | Ol-l-u |
| SIRENIA | Dioplotherium | T | Mi-l | T | Mi-m |
| SIRENIA | Dusisiren | T | Mi-m | T | Plio-l |
| SIRENIA | Eosiren | T | Eo-u | T | Eo-u |
| SIRENIA | Felsinotherium | T | Plio-l | T | Plio-u |
| SIRENIA | Halianassa | T | Mi-l | T | Mi-u |
| SIRENIA | Halitherium | T | Ol-l | T | Ol-u |
| SIRENIA | Hesperosiren | T | Mi-l | T | Mi-l |
| SIRENIA | Hydrodamalis | T | Plio-l | R | |
| SIRENIA | Indosiren | T | Mi-u | T | Mi-u |
| SIRENIA | Ishatherium | T | Eo-m | T | Eo-m |
| SIRENIA | Lophiodolus | T | Ol-l | T | Ol-l |
| SIRENIA | Manatus | Q | Plei | R | |
| SIRENIA | Metaxytherium | T | Mi-l-u | T | Mi-u-l |
| SIRENIA | Miosiren | T | Plio-l | T | Plio-l |
| SIRENIA | Paralitherium | T | Eo-u | T | Eo-u |
| SIRENIA | Potamosiren | T | Mi-l | T | Mi-l |
| SIRENIA | Prohalicore | T | Mi-m | T | Mi-m |
| SIRENIA | Prorastomus | T | Eo-l | T | Eo-u |
| SIRENIA | Protosiren | T | Eo-m-l | T | Eo-m-u |
| SIRENIA | Prototherium | T | Eo-u | T | Eo-u |
| SIRENIA | Ribodon | T | Mi-u-u | T | Mi-u-u |
| SIRENIA | Rytiodus | T | Mi-l | T | Mi-l |
| SIRENIA | Scaldicetus | T | Mi-l | T | Mi-u |
| SIRENIA | Sirenavus | T | Eo-m-l | T | Eo-m-l |
| SIRENIA | Thalattosiren | T | Mi-l | T | Mi-l |
| SIRENIA | Trichechus | T | Plio | R | |
| SIRENIA | Xenosiren | T | Plio-l | T | Plio-l |
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FOP = Period of first occurrence
FOS = Stage of first occurrence
LOP = Period of last occurrence
LOS = Stage of last occurrence
Stage abbreviations follow Sepkoski (2002).