Wikispecies has information related to Protognathus.
Protognathus may refer to:
- Protognathus, genus of ground beetle described in 1950 but later considered as a synonym of Pseudognathaphanus.
- Protognathosaurus, genus of sauropod that is originally described as Protognathus.
- Protognathodus, genus of conodont, sometimes described as Protognathus.
- Protognathinus, genus of extinct beetle that is sometimes misspelled as Protognathus.
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