Examples of representing beings: frogs, toads, salamanders. Basic morphology: two pairs of limbs, eyelids, hydrodynamic larvae. Skin: moist and permeable, mucous glands. Respiration: cutaneous and pulmonary, branchial in larval stage. Circulation: closed, incomplete, heart with three chambers without interventricular septum. Nitrogen waste: urea. Thermal control: heterothermic. Types of reproduction: **, water dependant, external fecundation and aquatic larval stage.
