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The sterol composition of Hymeniacidon sanguinea and Halichondria panicea from the Black Sea was investigated. Both sponges contain similar mixtures of stanols and of dietary Δ 5 -sterols. Main sterols appeared to be C 27 -sterols, which could be connected with a common diet for the both sponges. Saturated short side chain sterols have been found in Hymeniaci­don sanguinea. Three of them were novel for sponges. A possibility for the transformation of some dietary sterols into stands is discussed.

Sterol Composition of the Black Sea Sponges Hymeniacidon sanguinea (Grant) and Halichondria panicea (Pallas)