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Skin color in the squids Loligo pealii and Loligo opalescens

I. Chromatophores

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Summary

Rapid, physiological color changes seen in the skin of cephalopods are due to a unique anatomical system composed of chromatophore organs and iridophores. The morphology and ultrastructure of the chromatophores was studied in the squids Loligo pealii Lesueur and Loligo opalescens Berry. A three-dimensional model of a brown chromatophore was reconstructed from serial sections for the electron microscope.

The chromatophore organ is composed of a central nucleated pigment cell, 10–30 obliquely striated muscle cells (radially arranged on the equator of the pigment cell), axons, Schwann cells, and sheath cells. The pigment cell consists of a central aggregation of pigment granules and surrounding peripheral cytoplasmic compartments. These regions are incompletely separated by an electron-dense, sac-like structure, the pigment container. Proximal portions of a muscle cell contact the pigment cell in regions called myo-chromatophore junctions. Neuromuscular and myo-muscular junctions are also present.

The results presented are discussed in terms of previous morphological and physiological studies of chromatophores.

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  1. Department of Anatomy, New York Medical College, New York, N.Y.

    Susan Mirow

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Part of a study submitted in partial fulfillment of the requirement for the degree of Ph. D. (Anatomy), the Graduate School of Basic Medical Sciences, New York Medical College, New York, N.Y. 10029.

The research reported here was in part supported by grants from the Health Research Council of the City of New York (U-1008) and United States Public Health Service, General Research Grant No. FR-05398.

Report on some of this material was given at the Annual Meeting of the American Association of Anatomists, Philadelphia, Pennsylvania, April 19–22, 1971.

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Mirow, S. Skin color in the squids Loligo pealii and Loligo opalescens . Z.Zellforsch 125, 143–175 (1972). https://doi.org/10.1007/BF00306786

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