Hylonomus

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Hylonomus
Fossil range: Early Pennsylvanian (Late Carboniferous)

The primitive sauropsid, Hylonomus lyelli

Kingdom:	Animalia
Phylum:	Chordata
Subphylum:	Vertebrata
Class:	Sauropsida
Subclass:	Anapsida
Order:	Captorhinida
Family:	Protorothyrididae
Genus:	Hylonomus
Species:	H. lyelli

Binomial name

Hylonomus lyelli

Hylonomus (hylo- "forest" + nomos "wanderer")^[1] was an early reptile. It lived 315 million years ago during the Carboniferous period. As of 2006 it is the earliest confirmed reptile (Westlothiana is older but may be an amphibian). It was 20 cm long (including the tail) and probably would have looked rather similar to modern lizards. It had small sharp teeth and probably ate small invertebrates, such as millipedes or early insects. It is a precursor of later reptiles. Fossils of the basal pelycosaur Archaeothyris and the basal diapsid Petrolacosaurus are also found in the same region of Nova Scotia.

Fossils of Hylonomus have been found in the remains of fossilized tree stumps in Joggins, Nova Scotia. It's thought that after harsh weather, the tree tops would crash down and the stumps became hollowed out due to rot. Hylonomus individuals seeking shelter would enter but get trapped, starving to death.

Fossilized footprints found in New Brunswick have been attributed to Hylonomus.^[2]

This animal was discovered by Sir William Dawson in the 1800s. The name comes from the Greek word for wood, the Latin for mouse (forest mouse), and the name of the geologist, and Dawson's teacher, Sir Charles Lyell.