Publication: The foveal photoreceptor mosaic in the pipefish, Corythoichthyes paxtoni Syngnathidae, Teleostei
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Date
1999
Authors
Collin, S.P. ; Collin, H.B.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
The foveal and non-foveal retinal regions of
the pipefish, Corythoichthyes paxtoni (Syngnathidae,
Teleostei) are examined at the level of the light and
electron microscopes. The pipefish possesses a deep, pit
(convexiclivate) fovea which, although lacking the
displacement of the inner retinal layers as described in
other vertebrate foveae, is characterised by the exclusion
of rods, a marked increase in the density of photoreceptors
and a regular square mosaic of four double
cones surrounding a central single cone. In the perifoveal
and peripheral retinal regions, the photoreceptor
mosaic is disrupted by the insertion of large numbers of
rods, which reduce spatial resolving power but may
uniformly increase sensitivity for off-axis rays. In
addition to a temporal fovea subtending the frontal
binocular field, there is also a central area centralis
subtending the monocular visual field. Based on
morphological comparisons with other foveate teleosts,
four foveal types are characterised and foveal function
discussed with respect to the theoretical advantage of a
regular square mosaic.
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