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Title: Optics of the ultraviolet reflecting scales of a jumping spider
Authors: Land, M.F.
Horwood, J.
Lim, M.L.M. 
Li, D. 
Keywords: Cosmophasis umbratica
Mating behaviour
Structural colour
Ultraviolet reflection
Issue Date: 7-Jul-2007
Source: Land, M.F., Horwood, J., Lim, M.L.M., Li, D. (2007-07-07). Optics of the ultraviolet reflecting scales of a jumping spider. Proceedings of the Royal Society B: Biological Sciences 274 (1618) : 1583-1589. ScholarBank@NUS Repository.
Abstract: The jumping spider Cosmophasis umbratica from Singapore is strongly sexually dimorphic. The males, but not the females, reflect ultraviolet as well as green-orange light. The scales responsible for this are composed of a chitin-air-chitin sandwich in which the chitin layers are three-quarters of a wavelength thick and the air gap a quarter wavelength (where λ = 600 nm, the peak wavelength of the principal reflection maximum). It is shown that this configuration produces a second reflectance peak at approximately 385 nm, accounting for the observed reflection in the ultraviolet. Other scales have a similar thickness of chitin but lack the air gap and thus produce a dull purple reflection. This novel mechanism provides the spiders with two colour signals, both of which are important in mating displays. © 2007 The Royal Society.
Source Title: Proceedings of the Royal Society B: Biological Sciences
ISSN: 09628452
DOI: 10.1098/rspb.2007.0328
Appears in Collections:Staff Publications

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