The Evolution of Eyes in the Bivalvia: New Insights*

@inproceedings{Morton2008TheEO,
  title={The Evolution of Eyes in the Bivalvia: New Insights*},
  author={B. Morton},
  year={2008}
}
Abstract: Two types of multi-cellular eyes have been identified in the Bivalvia. Paired cephalic eyes occurring internally above the anterior end of the ctenidia are seen only in representatives of the Arcoidea, Limopsoidea, Mytiloidea, Anomioidea, Ostreoidea, and Limoidea. These eyes, comprising a pit of photo-sensory cells and a simple lens, are thought to represent the earliest method of photoreception. Many shallow-water marine, estuarine, and freshwater bivalves also possess simple… Expand
Development of the pallial eye in Nodipecten nodosus (Mollusca: Bivalvia): insights into early visual performance in scallops
TLDR
Whereas the pallial eyes from adult scallops are a complex visual system based on a mirror mechanism to form a focused image on the retina, early eye condition suggests a simple degree of directional photoreception, with no spatial vision. Expand
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TLDR
The observed patterns suggest that eye evolution in pteriomorphians might have evolved in association with light‐guided behaviors, such as phototaxis, body posture, and alarm responses, in lineages that shift to burrowing lifestyles and deep‐sea habitats. Expand
Three-dimensional reconstructions of pallial eyes in Pectinidae (Mollusca: Bivalvia)
TLDR
It is shown how morphological characteristics such as the hyperbolic shape of the lens can be overlooked if only single sections are investigated and how three-dimensional reconstructions of microtome sections enable the comparison of whole eyes and structures in contrast to single-section analysis. Expand
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TLDR
Because most bivalves lack complex eyes and ganglia and are unable to swim, scallops may be a promising system in which to study the co-evolution of image-forming eyes, centralised nervous systems and new forms of locomotion. Expand
The ectopic compound ommatidium-like pallial eyes of three species of Mediterranean (Adriatic Sea) Glycymeris (Bivalvia: Arcoida). Decreasing visual acuity with increasing depth?
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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. Expand
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TLDR
The hypothesis that image-forming eyes have contributed to the diversification of taxa in the geological past is tested and more finely resolved patterns support the hypothesis that good vision is a key trait that promoted preferential diversification. Expand
On the Evolutionary Significance of the Mantle Margin in Pteriomorphian Bivalves
TLDR
The present work discusses how the mantle margin can be used as a model for investigating the evolution of the marine epifaunal benthos as many species in this community have undergone similar selective pressures and developed comparable morphological adaptations, such as ciliated tentacular organs. Expand
Photoreception and the Polyphyletic Evolution of Photoreceptors (with Special Reference to Mollusca)*
TLDR
It is proposed that the evolutionary pathway of photoreceptors reflects two different, successive processes: the (monophyletic?) differentiation ofPhotoreception as such, mediated by a specific transcription factor gene (such as Pax-6 or sine oculis) and the genetic information of that induction factor (normative unit for photoreception). Expand
Mantle margin morphogenesis in Nodipecten nodosus (Mollusca: Bivalvia): new insights into the development and the roles of bivalve pallial folds
TLDR
Analysis of the mantle margin of the scallop Nodipecten nodosus shows that the middle mantle fold forms from the outer surface of the inner fold after metamorphosis and that the initial unfolded mantle margin may represent a common condition among bivalves. Expand
The biology and functional morphology of Septifer bilocularis and Mytilisepta virgata (Bivalvia: Mytiloidea) from corals and the exposed rocky shores, respectively, of Hong Kong
TLDR
It is argued that species of Septifer can be retained within the Septiferinae, as currently defined, whereas M. virgata, as the type species, should possibly be placed in its own subfamily – the Mytiliseptiferinee – and, again possibly, allied with the Brachidontiinae. Expand
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References

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  • Geological Society, London, Special Publications
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TLDR
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