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A Method for Extracting Pigments from Squid Doryteuthis pealeii

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White reflection from cuttlefish skin leucophores.

Roger T Hanlon¹, Lydia M Mäthger, George R R Bell

¹Marine Biological Laboratory, Woods Hole, MA 02543 United States of America. Department of Microbiology and Molecular Genetics, University of California, Davis, California 95616, United States of America.

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Summary

Cephalopod skin patterns rely on leucophores, which are structural reflectors producing whiteness. Their brightness varies based on the density and arrangement of leucocytes and iridocytes within the skin.

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Area of Science:

* Zoology
* Biophotonics
* Structural coloration

Background:

* Cephalopods exhibit dynamic skin patterns for communication and camouflage, necessitating tunable whiteness.
* Leucophores, dermal aggregates of leucocytes with spherical leucosomes, are responsible for producing whiteness.
* Leucophores often contain iridocytes with plate-like iridosomes, both containing the protein reflectin.

Purpose of the Study:

* To investigate the morphological and spectrographic properties of four distinct leucophore components in *Sepia officinalis*.
* To correlate skin brightness with the density, thickness, and proportion of leucocytes and iridocytes.
* To understand how structural arrangements of spheres and plates generate varying degrees of white structural coloration.

Main Methods:

* Morphological analysis of leucophore components.
* Spectrometric analysis of light reflection properties.
* Correlation of cellular composition with brightness measurements.

Main Results:

* Four white skin patterns (*Sepia officinalis*) were ranked by brightness: white fin spots, white zebra bands, white square, and white head bar.
* Brighter patterns (fin spots, zebra bands) showed higher leucocyte density, more cell layers, and a greater leucocyte-to-iridocyte ratio.
* Duller patterns (square, head bar) exhibited lower cell density, fewer layers, and a lower leucocyte-to-iridocyte ratio.

Conclusions:

* Complex morphological arrangements of leucophores, specifically the differential combination of spheres (leucosomes) and plates (iridosomes), produce varying degrees of white structural coloration.
* The density and proportion of leucocytes and iridocytes are key determinants of skin brightness in cephalopods.
* Leucophores are passive optical elements, reflecting ambient light colors and diffusing wavelengths based on their ultrastructure.