Hylonomus

Hylonomus; Temporal range:
	Model
Scientific classification
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.

[M2021-1] 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.

[2] Genus Hylonomus Etymology

[3] 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.

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