Opalios
| Opalios Temporal range: Late Cretaceous (Cenomanian), | |
|---|---|
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Monotremata |
| Superfamily: | Ornithorhynchoidea |
| Family: | †Opalionidae Flannery et al., 2024 |
| Genus: | †Opalios Flannery et al., 2024 |
| Species: | †O. splendens |
| Binomial name | |
| †Opalios splendens Flannery et al., 2024 | |
Opalios (meaning "opal") is an extinct genus of monotreme mammal from the Late Cretaceous (Cenomanian) Griman Creek Formation of Australia. The genus contains a single species, O. splendens, known from a fragmentary left dentary.