| Cronopio dentiacutus Temporal range:
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|---|---|
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| Skull diagram. Scale bar = 5 mm | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Clade: | Cladotheria |
| Clade: | †Meridiolestida |
| Genus: | †Cronopio Rougier et al. 2011 |
| Species: | †C. dentiacutus
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| Binomial name | |
| †Cronopio dentiacutus Rougier et al. 2011
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Cronopio is an extinct genus of small insectivorous mammal known from the early Late Cretaceous of the Río Negro region in Argentina. Its only species is Cronopio dentiacutus.[1] It belongs to the Meridiolestida, an extinct group of mammals widespread in South America during the Late Cretaceous, which are more closely related to modern marsupials and placental mammals than to monotremes.
- ^ Guillermo W. Rougier; Sebastián Apesteguía; Leandro C. Gaetano (2011). "Highly specialized mammalian skulls from the Late Cretaceous of South America". Nature. 479 (7371): 98–102. Bibcode:2011Natur.479...98R. doi:10.1038/nature10591. PMID 22051679. S2CID 4380850, supplementary information.