Ultraviolet polarisation sensitivity in the stomatopod crustacean <Emphasis Type="Italic">Odontodactylus scyllarus</Emphasis> |
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Authors: | Sonja Kleinlogel N Justin Marshall |
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Institution: | 1.Sensory Neurobiology Group, School of Biomedical Sciences,University of Queensland,Brisbane,Australia;2.Max-Planck-Institut für Biophysik,Frankfurt am Main,Germany |
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Abstract: | The ommatidia of crustacean eyes typically contain two classes of photoreceptors with orthogonally oriented microvilli. These
receptors provide the basis for two-channel polarisation vision in the blue–green spectrum. The retinae of gonodactyloid stomatopod
crustaceans possess a great variety of structural specialisations for elaborate polarisation vision. One type of specialisation
is found in the small, distally placed R8 cells within the two most ventral rows of the mid-band. These ultraviolet-sensitive
photoreceptors produce parallel microvilli, a feature suggestive for polarisation-sensitive photoreceptors. Here, we show
by means of intracellular recordings combined with dye-injections that in the gonodactyloid species Odontodactylus scyllarus, the R8 cells of mid-band rows 5 and 6 are sensitive to linear polarised ultraviolet light. We show that mid-band row 5 R8
cells respond maximally to light with an e-vector oriented parallel to the mid-band, whereas mid-band row 6 R8 cells respond maximally to light with an e-vector oriented
perpendicular to the mid-band. This orthogonal arrangement of ultraviolet-sensitive receptor cells could support ultraviolet
polarisation vision. R8 cells of rows 5 and 6 are known to act as quarter-wave retarders around 500 nm and thus are the first
photoreceptor type described with a potential dual role in polarisation vision. |
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