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A red seaweed  Croisettea  sp. from Indonesia is reported for the first time. The species was collected from the south coastal area of Yogyakarta, Indonesia. The molecular identification was carried out by amplification of mitochondria gene ( cox ). The phylogenetic analysis revealed that the red seaweed belongs to the family Kallymeniaceae from the genus  Croisettea  with 93.3% similarity to  Croisettea tasmanica . The ash and protein contents were 16.12% and 14.51% of the dry weight, respectively. Analysis of FT-IR spectra indicated that the seaweed contained galactan sulphate with gelling property. The spectra of GC-MS showed the presence of saturated fatty acids (palmitic acid and stearic acid) and unsaturated fatty acid (oleic acid) and phthalate ester derivative. The spectra of  1  H-NMR confirmed the presence of the phthalate derivative Bis(2-ethylhexyl phthalate).

First report on chemistry of a red seaweed Croisettea sp. from the coastal area of Yogyakarta, Indonesia