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KARRER1) et al. confirmed the existence of astaxanthin in red sea sponge , Axinella cristaglli. DRUMM et al.2,3) reported the presence of echinenone, γ-carotene in Hymeni acidon sanguineum. In 1957 YAMAGUCHI4) first isolated the aromatic carotenoids, reniera tene, isorenieratene and renierapurprin from Rerriera japonica. The existence of mono-hydroxy-β-isorenieratene and β-renieratene was recently isolated by SMITH5). A new undescribed aromatic carotenoid was isolated from the sea sponge, Tedania digitata.

Biochemical studies on the carotenoids in porifera. The structure of a new carotenoid, Tedaniaxanthin in sea sponge, Tedania digitata.