PrepZii

comparison

Ammonotelic vs Ureotelic vs Uricotelic

Nitrogenous wastes differ in toxicity, water need and animal examples.

Which nitrogenous waste needs excess water for excretion?

Ammonia or $\mathrm{NH_3}$ .

Type	Waste	Water/toxicity recall	Source examples
Ammonotelism	$\mathrm{NH_3}$	Highly toxic, soluble, needs excess water	Aquatic invertebrates, aquatic insects, bony fishes, aquatic amphibians etc.
Ureotelism	Urea	Less toxic; moderate water	Cartilaginous fishes, frogs, toads, alligators, turtles, mammals etc.
Uricotelism	Uric acid	Water insoluble, less toxic; no water needed	Insects, some land crustaceans, land snails, terrestrial reptiles and birds