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Evolution of the vertebrate eye: opsins, photoreceptors, retina and eye cup
A wide range of findings are reviewed that capture glimpses of the gradations that appear to have occurred during eye evolution, and a scenario for the unseen steps that have led to the emergence of the vertebrate eye is provided.
Behavioural ecology and retinal cell topography
- S. Collin
Although processing at the level of the photoreceptors may not necessarily change the neural image, it is the ganglion cells which ultimately define the perception of a species’ environment received by the central nervous system.
The eyes of deep-sea fish II. Functional morphology of the retina
The influence of ontogeny and light environment on the expression of visual pigment opsins in the retina of the black bream, Acanthopagrus butcheri
An increased proportion of long wavelength-sensitive double cones was found in fishes reared in the short wavelength-reduced conditions and in wild-caught animals, indicating that the expression of cone opsin genes is also regulated by environmental light.
Retinal ganglion cell topography in teleosts: A comparison between nissl‐stained material and retrograde labelling from the optic nerve
In the three species studied 92%, 80%, and 66% were found to be the maximum proportion of true ganglion cells in the area centralis, horizontal streak, and periphery, respectively, which is the major contribution to this discrepancy from peripheral nonspecialized regions of the retina.
The Retinal Wholemount Technique: A Window to Understanding the Brain and Behaviour
- J. Ullmann, Bret A. Moore, S. Temple, E. Fernández-Juricic, S. Collin
- BiologyBrain, Behavior and Evolution
- 6 December 2011
The present study examines all aspects of the wholemount technique, including enucleation, fixation, retinal extraction, flattening, staining, visualization of labelled cells and stereological mapping of cell density.
Volumetric analysis of sensory brain areas indicates ontogenetic shifts in the relative importance of sensory systems in elasmobranchs
The first evidence for shifts in the size of sensory brain areas in elasmobranchs is provided and it is suggested that vision is relatively more important than olfaction in juvenile elasmOBranchs and vice versa in adults.
Molecular ecology and adaptation of visual photopigments in craniates
This review discusses the origins and spectral tuning of photopigments that first arose in the agnathans to sample light within the ancient aquatic landscape of the Early Cambrian, detailing the molecular changes that subsequently occurred in each of the opsin classes independently within the main branches of extant jawed gnathostomes.
A web‐based archive for topographic maps of retinal cell distribution in vertebrates
- S. Collin
- BiologyClinical & experimental optometry
- 1 January 2008
The launch of a web‐based archive of previously published topographic maps of retinal cell distribution in vertebrates is announced, which is a unique collection of most of the currently available retinal maps, which also presents relevant information, where known, about eye size,retinal cell density, retinal orientation, cell number, spatial resolving power and the type of specialisation.
The biology of extinct and extant sawfish (Batoidea: Sclerorhynchidae and Pristidae)
- B. Wueringer, L. Squire, S. Collin
- Environmental ScienceReviews in Fish Biology and Fisheries
- 19 March 2009
Close examination of the morphology of pectoral fin basals and the internal structure of the rostrum reveals that sclerorhynchids and pristids evolved independently from rhinobatids, whereas pristiophorids are squalomorph sharks.