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1 August 2001 Morphology and Topographical Organization of the Retina of Juvenile Loggerhead Sea Turtles (Caretta caretta)
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The vertical organization and spatial variation of the main features of the retina of juvenile loggerhead sea turtles (Caretta caretta) were studied. Eyes were sectioned into 5-μm slices and examined using light microscopy techniques. Within each section, photoreceptor cells and ganglion cells were identified and counted. The topographical organization of cells along the retina was examined for the presence of an area centralis. The results show that the basic organization of the loggerhead retina closely follows the general vertebrate model. The retina is duplex in nature, containing both cone and rod cells throughout the photoreceptor layer. Moreover, the organization of the neural layers indicates that this eye is adapted for both high spatial resolution and low light sensitivity. A higher concentration of both cone photoreceptor cells and ganglion cells occurs dorsal to the equator of the eye, and their numbers are positively correlated. These findings suggest that loggerhead sea turtles possess a horizontal streak in the dorsal region of the retina, an attribute that could be beneficial for the loggerhead's benthic lifestyle.

The American Society of Ichthyologists and Herpetologists
Soraya Moein Bartol and John A. Musick "Morphology and Topographical Organization of the Retina of Juvenile Loggerhead Sea Turtles (Caretta caretta)," Copeia 2001(3), 718-725, (1 August 2001).[0718:MATOOT]2.0.CO;2
Accepted: 19 March 2001; Published: 1 August 2001

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