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Animal species that store bilins from external sources are very rare. A new example is described here. - Since the primitive marine metazoon Trichoplax adhaerens stains crimsonred when feeding on a phycoerythrin-containing alga. i.e. Pyrenomonas sp. (Cryptophyceae), the question arose whether an algal pigment can be identified as the staining matter. Thin layer chromatography and visible light absorption spectrography of aqueous Trichoplax extract disclosed several bilin components representing chromophores of phycoerythrin, a photosynthetic antenna protein that occurs only in certain algae and cyanobacteria. - Additional experiments showed that a cell-free Trichoplax extract kills and incompletely digests Pyrenomonas algae releasing phycoerythrin into the medium. These digestive faculties of Trichoplax tissue components, probably enzymes, contribute to the animal’s natural feeding mechanisms that proceed extra-as well as intracorporally. While the large apoprotein component of phycoerythrin is metabolized as a nutrient, the remaining chromophore bilins, strikingly coloured tetrapyrroles, are stored within Trichoplax’ distinct cellular inclusions, staining the animal crimson

Phycoerythrin: Release from Cryptophycean Algae and Bilin Storage by the Primitive Metazoon Trichoplax adhaerens (Placozoa)