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The carotenoids from sea sponge Gelliodes callista were investigated. A new carotenoidgelliodesxanthin has been isolated and the structure 3-hydroxy-4-oxo-3', 4'-didehydro-2'-apo-β, φ-caroten-2'-al was proposed from the basis of the specCral data. Gelliodenone which seems to be an artifact carotenoid of gelliodesxanthin was also isolated and the structure was elucidated as 3-hydroxy-3', 4'-didehydro-16'-methyl-17'-nor-β, φ-carotene-4, 16'-dione. Besides gelliodesxanthin, β-carotene, spheroidenone, echinenone, canthaxanthin astaxanthin, β-doradexanthin, zeaxanthin, alloxanthin, fucoxanthin and idoxanthin were identified.

A new aldehydic carotenoid gelliodesxanthin from sea sponge Gelliodes callista.