Publication: The deep-sea teleost cornea, a comparative study of gadiform fishes
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Date
1998
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 corneal structure of three deep-sea
species of teleosts (Gadiformes, Teleostei) from different
depths (250-4000 m) and photic zones are examined at
the leve1 of the light and electron microscopes. Each
species shows a similar but complex arrangement of
layers with a cornea split into dermal and scleral
components. The dermal cornea comprises an epithelium
overlying a basement membrane and a dermal stroma
with sutures and occasional keratocytes. Nezumia
aequalis is the only species to possess a Bowman's
layer, although it is not well-developed. The scleral
cornea is separated from the dermal cornea by a mucoid
layer and, in contrast to shallow-water species, is divided
into three main layers; an anterior scleral stroma, a
middle or iridescent layer and a posterior scleral stroma.
The iridescent layer of collagen and intercalated cells or
cellular processes is bounded by a layer of cells and the
posterior scleral stroma overlies a Descemet's membrane
and an endothelium. In the relatively shallow-water
Microgadus proximus, the keratocytes of the dermal
stroma, the cells of the iridescent layer and the
endothelial cells al1 contain aligned endoplasmic
reticulum, which may elicit an iridescent reflex. No
alignment of the endoplasmic reticulum was found in N.
aequalis or Coryphanoides (Nematonurus) armatus. The
relative differences between shallow-water and deep-sea
corneas are discussed in relation to the constraints of
light, depth and temperature.
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