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The ultrastructure of erythrophores and melanophores present in the skin of adult Tilapia mossambica is described. A comparison of the two types of chromatophores indicates that both show a smooth endoplasmic reticulum, pinocytotic vesicles, microtubules and complexly branching cell processes. However, differences in the form, consistency and distribution of erythrosomes and melanosomes are noted. It is suggested that erythrophores be defined as chromatophores including carotenoid derivatives as the main pigment in their erythrosomes.
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W. J. R. Lanzing (1975) studied this question.
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