The mode of preservation of the best- preserved fossil of Hylonomus is interesting. It was found inside the hollow stump of a dead lycopod tree that had grown within the coal forests. Such a stump would be colonized by insects, and insect-eating animals would seek rhem out. The skeleton of Hylonomus was found curled up in the fossil of such a stump. It may be that the Hylonomus individual climbed into the stumps to feed on the insects, or it is possible that it fell in and could not escape. Nevertheless its presence in the stump is taken as an indication that these were land- living animals. (walking dinosaur costume)
Features: Long regarded as the earliest reptile known, Hylonomus has the appearance, and probably had the lifestyle, of a modern lizard. There are five long toes on each foot and the tail is long and the neck short. Its insectivorous diet is shown by the short conical teeth, although the teeth at the front are a little longer than the rest. Tooth specialization such as this is usually only found on more advanced reptiles. The legs are held out to the side in the typical sprawling posture of lizards. Animatronic Dinosaur
Below: A similar-looking animal. Palaeothyris, is also known from the Joggins area of Nova Scotia. Another, Petrolacosaurus, comes from the late Carboniferous of Texas. USA.