 Based on a remarkably well preserved humerus and other traits, the animal is believed to have been an advanced reptile-like amphibian, close to the origin of amniotes.In life "Silvanerpeton" was about 40 cm (1 ft) long.Some paleontologists think it was semi-aquatic as an adult, others believe only young "Silvanerpeton" were aquatic and the adults were fully terrestrial.