Warrington Rachael (Orcid ID: 0000-0002-3871-5197) Hart Nathan (Orcid ID: 0000-0002-7289-9399) Visual opsin expression and morphological characterisation of retinal photoreceptors in the pouched lamprey ( Geotria australis , Gray) RUNNING TITLE: Characterising G. australis photoreceptors Rachael E. Warrington 1,2,3, *, Wayne I. L. Davies 2,3,4,5,6 , Jan M. Hemmi 2,3 , Nathan S. Hart 2,3,7 , Ian C. Potter 8 , Shaun P. Collin 2,3,5,6 and David M. Hunt 2,5 1 Neuroscience Research Institute, University of California Santa Barbara, CA, 93106, USA. 2 School of Biological Sciences, The University of Western Australia, Crawley, Perth, WA, 6009, Australia. 3 Oceans Institute, The University of Western Australia, Crawley, Perth, WA, 6009, Australia. 4 Umeå Centre for Molecular Medicine, Umeå University, Umeå, 901 87, Sweden. 5 Centre for Ophthalmology and Visual Science, Lions Eye Institute, University of Western Australia, Nedlands, Perth, WA, 6009, Australia. 6 School of Life Sciences, La Trobe University, Bundoora, Melbourne, VIC, 3086, Australia. 7 Department of Biological Sciences, Macquarie University, North Ryde, NSW, 2109, Australia. 8 Centre for Sustainable Aquatic Ecosystems, Murdoch University, Murdoch, Perth, WA, 6150, Australia. * Author for correspondence (rachaelwarrington@hotmail.com) This article is protected by copyright. All rights reserved. RESEARCH ARTICLE The Journal of Comparative Neurology Research in Systems Neuroscience DOI 10.1002/cne.25092 This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/cne.25092 © 2020 Wiley Periodicals, Inc. Received: Aug 20, 2020; Revised: Dec 09, 2020; Accepted: Dec 09, 2020