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Proc Biol Sci
2018 Jan 31;2851871:. doi: 10.1098/rspb.2017.2590.
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Whole-body photoreceptor networks are independent of ''lenses'' in brittle stars.
Sumner-Rooney L, Rahman IA, Sigwart JD, Ullrich-Lüter E.
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Photoreception and vision are fundamental aspects of animal sensory biology and ecology, but important gaps remain in our understanding of these processes in many species. The colour-changing brittle star Ophiocoma wendtii is iconic in vision research, speculatively possessing a unique whole-body visual system that incorporates information from nerve bundles underlying thousands of crystalline ''microlenses''. The hypothesis that these might form a sophisticated compound eye-like system regulated by chromatophores has been extensively reiterated, with investigations into biomimetic optics and similar supposedly ''visual'' structures in living and fossil taxa. However, no photoreceptors or visual behaviours have ever been identified. We present the first evidence of photoreceptor networks in three Ophiocoma species, both with and without microlenses and colour-changing behaviour. High-resolution microscopy, immunohistochemistry and synchrotron tomography demonstrate that putative photoreceptors cover the animals'' oral, lateral and aboral surfaces, but are absent at the hypothesized focal points of the microlenses. The structural optics of these crystal ''lenses'' are an exaptation and do not fulfil any apparent visual role. This contradicts previous studies, yet the photoreceptor network in Ophiocoma appears even more widespread than previously anticipated, both taxonomically and anatomically.
Aizenberg,
Calcitic microlenses as part of the photoreceptor system in brittlestars.
2001, Pubmed,
Echinobase
Aizenberg,
Calcitic microlenses as part of the photoreceptor system in brittlestars.
2001,
Pubmed
,
Echinobase Bielecki,
Ocular and extraocular expression of opsins in the rhopalium of Tripedalia cystophora (Cnidaria: Cubozoa).
2014,
Pubmed Blevins,
Spatial vision in the echinoid genus Echinometra.
2004,
Pubmed
,
Echinobase Bok,
Here, There and Everywhere: The Radiolar Eyes of Fan Worms (Annelida, Sabellidae).
2016,
Pubmed Burke,
A genomic view of the sea urchin nervous system.
2006,
Pubmed
,
Echinobase D'Aniello,
Opsin evolution in the Ambulacraria.
2015,
Pubmed
,
Echinobase Delroisse,
High opsin diversity in a non-visual infaunal brittle star.
2014,
Pubmed
,
Echinobase Delroisse,
De Novo Adult Transcriptomes of Two European Brittle Stars: Spotlight on Opsin-Based Photoreception.
2016,
Pubmed
,
Echinobase Garm,
Visual navigation in starfish: first evidence for the use of vision and eyes in starfish.
2014,
Pubmed
,
Echinobase Gorzelak,
Microlens arrays in the complex visual system of Cretaceous echinoderms.
2014,
Pubmed
,
Echinobase Jackson,
Orientation to Objects in the Sea Urchin Strongylocentrotus purpuratus depends on apparent and not actual object size.
2011,
Pubmed
,
Echinobase Land,
Image formation by a concave reflector in the eye of the scallop, Pecten maximus.
1965,
Pubmed Lesser,
Sea urchin tube feet are photosensory organs that express a rhabdomeric-like opsin and PAX6.
2011,
Pubmed
,
Echinobase Leung,
Unconventional Roles of Opsins.
2017,
Pubmed Müller,
A cryptochrome-based photosensory system in the siliceous sponge Suberites domuncula (Demospongiae).
2010,
Pubmed Nilsson,
Advanced optics in a jellyfish eye.
2005,
Pubmed Nilsson,
The evolution of eyes and visually guided behaviour.
2009,
Pubmed O'Hara,
Restructuring higher taxonomy using broad-scale phylogenomics: The living Ophiuroidea.
2017,
Pubmed Petie,
Crown-of-thorns starfish have true image forming vision.
2016,
Pubmed
,
Echinobase Raible,
Opsins and clusters of sensory G-protein-coupled receptors in the sea urchin genome.
2006,
Pubmed
,
Echinobase Ramirez,
Understanding the dermal light sense in the context of integrative photoreceptor cell biology.
2011,
Pubmed Ramirez,
The Last Common Ancestor of Most Bilaterian Animals Possessed at Least Nine Opsins.
2016,
Pubmed Richter,
Invertebrate neurophylogeny: suggested terms and definitions for a neuroanatomical glossary.
2010,
Pubmed Schindelin,
Fiji: an open-source platform for biological-image analysis.
2012,
Pubmed Speiser,
A chiton uses aragonite lenses to form images.
2011,
Pubmed Sumner-Rooney,
Whole-body photoreceptor networks are independent of 'lenses' in brittle stars.
2018,
Pubmed
,
Echinobase Ullrich-Lüter,
Unique system of photoreceptors in sea urchin tube feet.
2011,
Pubmed
,
Echinobase Vukusic,
Photonic structures in biology.
2003,
Pubmed Whitfield,
Presumptive ciliated receptors associated with the fibrillar glands of the spines of the echinoderm Amphipholis squamata.
1983,
Pubmed
,
Echinobase Yerramilli,
Spatial vision in the purple sea urchin Strongylocentrotus purpuratus (Echinoidea).
2010,
Pubmed
,
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