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MRC» Hanlon» Skin ultrastructure & neurobiology
SKIN ULTRASTRUCTURE & NEUROBIOLOGY

Photo of Skin Close-up Photo of Skin Close-up Photo of Skin Close-up Photo of Skin Close-up

The colorful and changeable skin of cephalopods is an elegant arrangement of pigments and reflectors. We are interested in their gross and fine morphology, their control and their optical output. A wide variety of techniques is used to accomplish this research: light, electron and confocal microscopy; macrophotography and videography; underwater photography; electrophysiology, neuronal staining and tracing; and spectrometry (in the lab and the field). We collaborate with modelers, materials scientists and engineers to determine how cephalopods may inspire the development of novel materials.

iBioSeminar: Changeable Skin (31:00 min)




READ: How Squid Change Color

Publications on skin ultrastructure and neurobiology:

Izumi, M., Sweeney, A.M., DeMartini, D., Weaver, J. C., Powers, M.L., Tao, A., Silvas, T.V., Kramer, R.M., Crookes-Goodson, W.J., Mäthger, L.M., Naik, R.R., Hanlon, R.T., & Morse, D.E., 2010. Changes in reflectin protein phosphorylation are associated with dynamic iridescence in squid. J. Royal Society Interface 7: 549-560. (PDF)

Mäthger, L.M., Denton, E.J., Marshall, J., & Hanlon, R.T. 2009. Mechanisms and behavioral functions of structural coloration in cephalopods. Journal of the Royal Society Interface 6: S149-S164. (PDF)

Mäthger, L.M., Shashar, N., & Hanlon, R.T. 2009. Do cephalopods communicate using polarized light reflections from their skin? Journal of Experimental Biology 212: 2133-2140. (Featured Commentary) (PDF)

Allen, J.J., Mäthger, L.M., Barbosa, A., & Hanlon, R.T. 2009. Cuttlefish use visual cues to control 3-dimensional skin papillae for camouflage. Journal of Comparative Physiology A 195: 547-555.(PDF)

Miserez, A., Weaver, J.C., Pedersen, P.B., Schneeberk, T., Hanlon, R.T., Kisailus, D., & Birkedal, H. 2008. Microstructural and biochemical characterization of the nano-porous sucker rings from Dosidicus gigas. Advanced Materials 20: 1-6.

Mäthger, L.M., Denton, E.J., Marshall, J., & Hanlon, R.T. 2008. Mechanisms and behavioral functions of structural coloration in cephalopods. Journal of the Royal Society Interface 6: S149-S164.(PDF)

Sutherland, R.L., Mäthger, L.M., Hanlon, R.T., Urbas, A.M., & Stone, M.O. 2008. Cephalopod coloration model. I. Squid chromatophores and iridophores. Journal of the Optical Society of America, 25 (3): 588-599. (PDF)

Sutherland, R.L., Mäthger, L M., Hanlon, R.T., Urbas, A.M., & Stone, M.O. 2008. Cephalopod coloration model. II. Multiple layer skin effects. Journal of the Optical Society of America, 25 (8): 2044-2054. (PDF)

Chiou, T.H., Hanlon, R.T., Mäthger, L.M., & Cronin, T.W. 2007. Spectral and spatial properties of the polarized light reflections on the arms of squid (Loligo pealeii) and cuttlefish (Sepia officinalis L.). Journal of Experimental Biology. 210: 3624-3635.

Mäthger, L.M., & Hanlon, R.T. 2007. Malleable skin coloration in cephalopods: selective reflectance, transmission and absorbance of light by chromatophores and iridophores. Cell and Tissue Research 329: 179-186. (PDF)

Mäthger, L.M., Barbosa, A., Miner, S., & Hanlon, R.T. 2006. Color blindness and contrast perception in cuttlefish (Sepia officinalis). Vision Research 46: 1746-1753. (PDF)

Saidel, W.M., Shashar, N., Schmolesky, M.T., & Hanlon, R.T. 2005. Discriminative responses of squid (Loligo pealeii) photoreceptors to polarized light. Comparative Biochemistry & Physiology A: 142/3: 340-346.(PDF)

Shashar, N., Borst, D.T., Ament, S.A., Saidel, W.M., Smolowitz, R.M., & Hanlon, R.T. 2001. Polarization reflecting iridophores in the arms of the squid Loligo pealeii. Biol. Bull. 201:267-268. (PDF)

Hanlon, R.T., Cooper, K.M., Budelmann, B.U., & Pappas, T.C. 1990. Physiological color change in squid iridophores I. Behavior, morphology and pharmacology in Lolliguncula brevis. Cell Tissue Res. 259(1): 3-14.

Cooper, K.M., Hanlon, R.T., & Budelmann, B.U. 1990. Physiological color change in squid iridophores II. Ultrastructural mechanisms in Lolliguncula brevis. Cell Tissue Res. 259(1): 15-24.

Novicki, A., Budelmann, B.U., & Hanlon, R.T. 1990. Brain pathways of the chromatophore system in the squid Lolliguncula brevis. Brain Res. 519(1- 2): 315-323.

Cooper, K.M., & Hanlon, R.T. 1986. Correlation of iridescence with changes in iridophore platelet ultrastructure in the squid Lolliguncula brevis. J. exp. Biol. 121: 451-455.

Dubas, F., Hanlon, R.T., Ferguson, G.P., & Pinsker, H.M. 1986. Localization and stimulation of chromatophore motoneurones in the brain of the squid, Lolliguncula brevis. J. exp. Biol. 121: 1-25.

Dubas, F., Leonard, R.B., & Hanlon, R.T. 1986. Chromatophore motoneurons in the brain of the squid, Lolliguncula brevis: An HRP study. Brain Res. 374(1): 21-29.

Florey, E., Dubas, F., & Hanlon, R.T. 1985. Evidence for L-glutamate as a transmitter substance of motoneurons innervating squid chromatophore muscles. Comp. Biochem. Physiol. C. 82(2): 259-268.

Hanlon, R.T. 1982. The functional organization of chromatophores and iridescent cells in the body patterning of Loligo plei (Cephalopoda: Myopsida). Malacologia 23(1): 89-119.

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