Abstract
THE dark integumental pigments of some invertebrates1,2 have proved not to be closely related to the very insoluble and inert melanins, and this appears to be true also of the black pigment of the typical form of the planarian, Polycelis nigra (Müller). It may be called a body-pigment since in these flattened, mesenchymatous animals it is less clearly restricted to the integument than in the coelomates; nevertheless it is responsible for the visible colour of the animal and probably corresponds functionally to the integumental pigment of other groups.
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NEEDHAM, A. Body-pigment of Polycelis. Nature 206, 209–210 (1965). https://doi.org/10.1038/206209a0
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DOI: https://doi.org/10.1038/206209a0
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