title: The spectral sensitivity of the lens eyes of a box jellyfish, Tripedalia cystophora (Conant).
abstract: Box jellyfish, or cubomedusae (class Cubozoa), are unique among the Cnidaria in possessing lens eyes similar in morphology to those of vertebrates and cephalopods. Although these eyes were described over 100 years ago, there has been no work done on their electrophysiological responses to light. We used an electroretinogram (ERG) technique to measure spectral sensitivity of the lens eyes of the Caribbean species Tripedalia cystophora. The cubomedusae have two kinds of lens eyes, the lower and upper lens eyes. We found that both lens eye types have similar spectral sensitivities, which likely result from the presence of a single receptor type containing a single opsin. The peak sensitivity is to blue-green light. Visual pigment template fits indicate a vitamin A-1 based opsin with peak sensitivity near 500 nm for both eye types.
authors.affiliation: Hopkins Marine Station, Department of Biological Sciences, Stanford University, Oceanview Boulevard, Pacific Grove, California 93950, USA. Melissa.Coates@cob.lu.se
authors.forename: Melissa M
authors.initials: MM
authors.lastname: Coates
authors.forename: Anders
authors.initials: A
authors.lastname: Garm
authors.forename: Jamie C
authors.initials: JC
authors.lastname: Theobald
authors.forename: Stuart H
authors.initials: SH
authors.lastname: Thompson
authors.forename: Dan-Eric
authors.initials: DE
authors.lastname: Nilsson
mesh_terms: D000818:Animals; D037462:Cubozoa / Q000502:physiology*; D004596:Electroretinography; D007908:Lens, Crystalline / Q000502:physiology*; D017956:Photoreceptor Cells, Invertebrate / Q000502:physiology*; D017299:Rod Opsins / Q000502:physiology*; D013057:Spectrum Analysis
chemical_list: D017299:Rod Opsins