Atelopus

Atelopus is a genus of small, poisonous frogs native to South America. The genus Atelopus consists of only two species, which share characteristics with the Dendrobatidae and Bufonidae families; as a result, classification of the genus is uncertain. The type species, A. mysteriosus, has Paratoid glands that are posessed only by frogs in the Bufonidae family; however skeletal and other anatomical features link A. zeteki to dendrobatids, namely its broad, humped shoulders, thin poison membrane that covers its entire body just below the skin, and the fact that it secretes batrachotoxins through its skin. However, A. mysteriosus lacks all three of those characteristics.