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Biol Bull 132: 34-37. (February 1967)
© 1967 Marine Biological Laboratory
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NITROGENOUS EXCRETION IN THE TROPICAL SEA URCHIN DIADEMA ANTILLARUM PHILIPPI

JOHN B. LEWIS 1

1 Bellairs Research Institute of McGill University, St. James, Barbados, W. I.

Diadema antillarum is ammonotelic in its excretion of nitrogenous waste products. It excretes approximately 60% of its total nonprotein nitrogen as ammonia and approximately 30% as amino acids. No urea, uric acid or other purine bases were found to be excreted. A progressive increase in tissue ammonia content in the intestine towards the rectum suggests that the hind gut has an excretory function.






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Copyright © 1967 by the Marine Biological Laboratory.