| Hylonomus Temporal range:
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|---|---|
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| Model | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Eureptilia |
| Genus: | †Hylonomus Dawson, 1860 |
| Type species | |
| †Hylonomus lyelli Dawson, 1860
| |
Hylonomus (/haɪˈlɒnəməs/; hylo- "forest" + nomos "dweller")[2] is an extinct genus of reptile that lived 318 million years ago during the Bashkirian stage of the Late Carboniferous. It is the earliest known crown group amniote and the oldest known unquestionable reptile, with the only known species being Hylonomus lyelli.[3][1] Despite being amongst the oldest known reptiles, it is not the most primitive member of the group, being a eureptile more derived than either parareptiles or captorhinids.
- ^ a b Marjanović, D. (2021). "The Making of Calibration Sausage Exemplified by Recalibrating the Transcriptomic Timetree of Jawed Vertebrates". Frontiers in Genetics. 12. 521693. doi:10.3389/fgene.2021.521693. PMC 8149952. PMID 34054911.
- ^ Genus Hylonomus Etymology
- ^ Carpenter, D. K.; Falcon-Lang, H. J.; Benton, M. J.; Grey, M. (2015). "Early Pennsylvanian (Langsettian) fish assemblages from the Joggins Formation, Canada, and their implications for palaeoecology and palaeogeography". Palaeontology. 58 (4): 661–690. doi:10.1111/pala.12164.