Arenactinia
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| Arenactinia | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Cnidaria |
| Subphylum: | Anthozoa |
| Class: | Hexacorallia |
| Order: | Actiniaria |
| Family: | incertae sedis |
| Genus: | †Arenactinia Barroso et al., 2025 |
| Species: | †A. ipuensis |
| Binomial name | |
| †Arenactinia ipuensis Barroso et al., 2025 | |
 | |
| Parnaíba Basin | |
Arenactinia is a genus of sea anemone that lived during the early Silurian period. Its early appearance suggest that this genus may be related to the adaptive radiation of marine ecosystems following the Late Ordovician Extinction. This genus contains one species, Arenactinia ipuensis.[1]
It was discovered in South America in the Ipu formation in the Parnaiba Basin of Brazil.[1]