The presence of sphingomyelin as phospholipid in lower animals is quite rare but characteristic of higher animals． This paper describes isolation and structural characterlzation of a sphingomyeiin from the marine crab, Erimacrus isenbeekii． The chemical structure was completely characterized by aliphatic analyses, hydrogen fluoride degradation, acid hydrolysis, enzymatic hydrolysis, infrared analysis and matrix-assisted laser desorption ionization timeof-
flight mass spectrometry． The caramide moiety of the sphingomyelin consisted primarily of C18:0, C20:0, C22:0 and C22:1 fatty acids, and dihydroxy-C14:1, -14:0 and -C16:1 sphingoids．
ケガニ、Erimacrus isenbeckii (節足動物、甲殻類)におけるスフィンゴミエリンの存在
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