Amongst the amphibians, a few genera referred to the Seymouriamorpha show many developments that suggest they were evolving towards the reptilian condition. Some palaeontologists believe that these animals have attained the ‘half-way’ stage in the evolution of the first reptiles. Others, however, including A. L. Panchen, claim that Kotlassia prima and its relatives retain a lateral-line system and a tadpole stage in the early part of their life cycle. Kotlassia prima, known from the Upper Permian, is one of the last survivors of this important stock. See also seymouria.
Subjects: Earth Sciences and Geography.