Title

Morphology And Density Distribution Of Cone Photoreceptor In The Retina Of The Atlantic Stingray, Dasyatis-Sabina

Title - Alternative

J. Morphol.

Keywords

Reef Teleosts; Topography; Streaks; Areae; Anatomy & Morphology

Abstract

Light miscroscopy of the retina in the Atlantic stingray, Dasyatis sabina, reveal two distinct photoreceptor types. Histological criteria establish the two cell types as morphological rods and cones. The retina was studied through a sequential series of vertical sections in a protocol designed to evaluate the entire retina. By performing differential counts in multiple regions and expressing cones as a percent of the total photoreceptors in a domain, it was possible to determine relative cone density and distribution. Cone distribution varies throughout the retina in two patterns. First, relative cone density gradually decreases peripherally. Second, a cone-rich band occurs along the horizontal axis of the eye, extending from ora serrata to ora serrata. This structure appears to be a visual streak. Both distribution patterns are statistically significant and are consistent among animals regardless of age. (C) 1994 Wiley-Liss, Inc.

Publication Title

Journal of Morphology

Volume

221

Issue/Number

3

Publication Date

1-1-1994

Document Type

Article

Language

English

First Page

277

Last Page

289

WOS Identifier

WOS:A1994PD93900003

ISSN

0362-2525

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