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A ureotelic organism excretes excess nitrogen as urea. It is one of the three major forms of excretion of nitrogenous waste in organisms, the others being ammonotelism and uricotelism.[1]

Urea is less toxic than the ammonia excreted by ammonotelic organisms. It requires 0.05 L of water to excrete 1 g of nitrogen, approximately only 10% of that required in ammonotelic organisms. Ureotelic organisms include cartilaginous fish, some bony fish, adult amphibians, and mammals, among others.[1] Humans can be described as being ureotelic organisms.[2]

See also[edit]


  1. ^ a b S. Sreekumar (2010). Basic Physiology. PHI Learning Pvt. Ltd. p. 180–181. ISBN 9788120341074. 
  2. ^ Definition: ureotelic from Online Medical Dictionary