Visual fields and eye morphology support color vision in a color-changing crab-spider |
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| Authors: | Teresita C. Insausti Jérémy Defrize Claudio R. Lazzari Jérôme Casas |
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| Affiliation: | 1. Pós-graduação em Ecologia e Conservação de Recursos Naturais, Instituto de Biologia, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brazil;2. Núcleo de Extensão e Pesquisa em Ecologia e Evolução (NEPEE), Departamento de Ciências Biológicas, Universidade do Estado de Minas Gerais, Ituiutaba, Minas Gerais, Brazil;3. Instituto de Biologia, Universidade Federal de Uberlândia, Uberlândia, Minas Gerais, Brazil;1. Institute of Marine Science and Fishing Technology of Nha Trang University, 9 Nguyen Dinh Chieu Street, Nha Trang City, Viet Nam;2. Department of Undergraduate Studies of Nha Trang University, 2 Nguyen Dinh Chieu Street, Nha Trang City, Viet Nam;1. Institute of Neuroscience, Henry Wellcome Building, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK;1. INRA CASBAH group, Neuro-PSI Institute, CNRS, University Paris-Saclay, Gif-sur-Yvette, France;2. BioEmergences, Multilevel Dynamics in Morphogenesis, CNRS, Gif-sur-Yvette, France;3. Department of Molecular Cell and Developmental Biology, University of California Los Angeles, Los Angeles, USA |
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| Abstract: | Vision plays a major role in many spiders, being involved in prey hunting, orientation or substrate choice, among others. In Misumena vatia, which experiences morphological color changes, vision has been reported to be involved in substrate color matching. Electrophysiological evidence reveals that at least two types of photoreceptors are present in this species, but these data are not backed up by morphological evidence. This work analyzes the functional structure of the eyes of this spider and relates it to its color-changing abilities. A broad superposition of the visual field of the different eyes was observed, even between binocular regions of principal and secondary eyes. The frontal space is simultaneously analyzed by four eyes. This superposition supports the integration of the visual information provided by the different eye types. The mobile retina of the principal eyes of this spider is organized in three layers of three different types of rhabdoms. The third and deepest layer is composed by just one large rhabdom surrounded by dark screening pigments that limit the light entry. The three pairs of secondary eyes have all a single layer of rhabdoms. Our findings provide strong support for an involvement of the visual system in color matching in this spider. |
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