Dermochelys coriacea

Leatherback turtle, Dermochelys coriacea adult male found drowned in fishing net west coast of Britain adipose tissue vs. liver ... 

Lutcavage, M., and Lutz, P. L. (1986). Metabohc rate and food energy requirements of the leatherback sea mrde, Dermochelys coriacea. Copeia 1986, 796—798. 

Arsenocholine also occurs commonly in marine animals, usually as a trace constituent. One exception is the turtle Dermochelys coriacea where arsenocholine was a significant arsenic constituent in the liver (19). Arsenocholine has been found in terrestrial organisms and can occur as the major arsenical in some species. For example, it is the major arsenical in the fungus Sparassis crispa, although the concentration of total arsenic in S. crispa is quite low ( 1 p,g As/g dry mass) (20). 

Marine mammals examined so far have contained only low levels of arsenic, but in all cases, arsenobetaine was the dominant arsenical present (100). The liver of the turtle Dermochelys coriacea is unusual among marine animals because it contains arsenocholine at significant levels (19). 

JS Edmonds, Y Shibata, RIT Prince, KA Erancesconi, M Morita. Arsenic compounds in tissues of the leatherback turtle Dermochelys coriacea. J Marine Biol Assoc UK 74 463-466, 1994. 

---