Sometimes taxonomists create new names for groups that already have a name. They may do this because they are unaware of the original name, or they may think the organism before them belongs to a different group when in fact it does not. If two or more names are found to apply to the same group, they are considered synonyms. In most cases, the first name takes priority and is considered to be the valid or accepted name. However, there can be exceptions, and it's not always easy to determine which of a series of synonyms should be considered valid or accepted. Here we list the synonyms provided to EOL by our classification partners. We also include other versions of the name that most likely refer to the same group, for example, misspellings in the literature or different variations of the authorship associated with the name.

Preferred marks the preferred name from each source.

Integrated Taxonomic Information System (ITIS)

Name Relationship
Physeter Linnaeus, 1758 Preferred
Catodon Linnaeus, 1761 Junior synonym
Meganeuron Gray 1865
Megistosaurus Anonymous in Harlan, 1828


Name Relationship
Physeter Linnaeus, 1758 Preferred
Physeter catodon Linnaeus, 1758 Valid

Paleobiology Database

Name Relationship
Physeter Linnaeus, 1758 Preferred
Physeter macrocephalus Linnaeus, 1758 Synonym
Physeter microps Linnaeus, 1758
Catodon trumpo Lacepede 1804
Catodon svineval Lacepede 1804
Physalus cylindricus Lacepede 1804
Physeter orthodon Lacepede 1804
Physeter mular Lacepede 1804
Physeter tursio Linnaeus, 1758
Catodon australis MacLeay 1851
Meganeuron krefftii Gray 1866
Megistosaurus ensiformis Godman 1827
Physeter australasianus Desmoulins, 1822
Physeter australis Gray, 1846
Catodon Colneti Gray, 1850
Catodon polycyphus (Quoy and Gaimard 1824)


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