Abstract
Box jellyfish, or cubomedusae, possess an impressive total of 24 eyes of four morphologically different types. Compared to other cnidarians they also have an elaborate behavioral repertoire, which for a large part seems to be visually guided. Two of the four types of cubomedusean eyes, called the upper and the lower lens eye, are camera type eyes with spherical fish-like lenses. Here we explore the electroretinograms of the lens eyes of the Caribbean species, Tripedalia cystophora, and the Australian species, Chiropsalmus sp. using suction electrodes. We show that the photoreceptors of the lens eyes of both species have dynamic ranges of about 3 log units and slow responses. The spectral sensitivity curves for all eyes peak in the blue-green region, but the lower lens eye of T. cystophora has a small additional peak in the near UV range. All spectral sensitivity curves agree well with the theoretical absorbance curve of a single opsin, strongly suggesting color-blind vision in box jellyfish with a single receptor type. A single opsin is supported by selective adaptation experiments.








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Acknowledgments
We would like to thank Peter Ekström, Megan O’Connor, and Linda Parkefelt, Lund University, for commenting on the manuscript. Dan Nilsson acknowledges the grant nr 621–2002-4873 from the Swedish Research Council, Anders Garm likewise acknowledges grant nr 21-04-0423 from the Danish Research Council and Melissa Coates acknowledges the NSF pre-doctoral fellowship program. All the experiments comply with the “Principles of animal care”, publication No. 86-23, revised 1985 of the National Institute of Health, and also with the current laws of Puerto Rico.
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Garm, A., Coates, M.M., Gad, R. et al. The lens eyes of the box jellyfish Tripedalia cystophora and Chiropsalmus sp. are slow and color-blind. J Comp Physiol A 193, 547–557 (2007). https://doi.org/10.1007/s00359-007-0211-4
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DOI: https://doi.org/10.1007/s00359-007-0211-4