Structure and regeneration of the eyes of strombid gastropods

@article{Hughes2004StructureAR,
  title={Structure and regeneration of the eyes of strombid gastropods},
  author={Helen P. I. Hughes},
  journal={Cell and Tissue Research},
  year={2004},
  volume={171},
  pages={259-271}
}
  • H. P. Hughes
  • Published 20 August 1976
  • Biology, Medicine
  • Cell and Tissue Research
SummaryThe tips of the eyestalks of three species of strombid gastropods were amputated and the structure of the fully developed eye investigated. The retina contains at least two types of cell: sensory cells bearing long tufts of microvilli with a central cytoplasmic core, and pigment cells with short microvilli.New eyes became visible at the tips of the eyestalk stump 5–16 days after amputation. When the regenerated eyes first appear, they consist of hollow balls of cells with a pigment lined… 
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It is suggested that the ciliary photoreceptors of these teleplanic veliger larvae are correlated with a long pelagic life in the ocean, which can last up to twelve months, and that structural details of the photoreCEPTors can change during ontogenesis (ciliary vs rhabdomeric).
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The present study confirms earlier results and demonstrates that the distal part of the sensory cells is altered during ontogenesis, and confirms that both the supportive and corneal cells, as well as thedistal supportive cell processes which are restricted to the eyes of adults are involved in lens formation.
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It is supposed that: (a) these cilia have a transportive function for lens material and (b) that the ciliary photoreceptor of Aporrhais sp. and Bittium reticulatum is a functional adaptation to a relatively long larval period.
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  • Biology, Medicine
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The left cerebral ganglion was ablated from 72 anesthetized, adult Melampus bidentatus and dissections of animals sacrificed weekly showed that most nerves and connectives regrew within 30 days, attaching to the swollen end of the major labial nerve.
Role of the Age Factor in Eye Regeneration in the Gastropod Achatina fulica
The dependence of the ability to regenerate the eye on the age of experimental animals was studied in the snail Achatina fulica. The degree of regeneration was estimated by light-microscopic and
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Central visual projections in several gastropod species are identified and it is found that they have connections with other systems and organs that may be involved in the integration of signals from different sensors.
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The results further demonstrate the capacity of regeneration in S. haemastoma, which can be used as a new model in regeneration studies, and provides new data about the incidence of tentacular malformations in marine gastropods.
Restoration of morphological and functional integrity in the regenerating eye of the giant African land snail Achatina fulica
TLDR
Electroretinographic responses revealed that the molecular mechanism of phototransduction is restored, in principle, but that flicker fusion frequency in the regenerated eye is significantly lower than in the normal eye.
The ectopic compound ommatidium-like pallial eyes of three species of Mediterranean (Adriatic Sea) Glycymeris (Bivalvia: Arcoida). Decreasing visual acuity with increasing depth?
TLDR
Comparison eye dimensions suggest a hypothesised trend in eye size differences in relation to depth to be valid, which will be the differences in abilities to create a summed image and thereby reduce visual acuity.
The marine gastropod Conomurex luhuanus (Strombidae) has high-resolution spatial vision and eyes with complex retinas
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Behavioural trials indicate the eyes of conch snail species Conomurex luhuanus provide high-resolution spatial vision, and morphological examination reveals the retina contains more cell types than those of other gastropods.
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