| Iapetognathus fluctivagus Temporal range:
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Conodonta |
| Order: | †Proconodontida |
| Family: | †Cordylodontidae |
| Genus: | †Iapetognathus |
| Species: | †I. fluctivagus
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| Binomial name | |
| †Iapetognathus fluctivagus Nicoll, Miller, Nowlan, Repetski & Ethington, 1999
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Iapetognathus fluctivagus is a species of denticulate cordylodan conodonts belonging to the genus Iapetognathus. It existed during the Tremadocian Age (485.4 million years ago) of the Ordovician. It is an important index fossil in biostratigraphy.