Nectridea is an extinct order of lepospondyl amphibians from the Carboniferous and Permian periods, which included animals such as Diplocaulus. In appearance, they would have resembled modern newts or aquatic salamanders. They had long flattened tails to aid in swimming, and well developed hind limbs, with a full set of five toes each. The forelimbs were somewhat reduced however, and typically had only four toes each.