The convoluted evolution of snail chirality

@article{Schilthuizen2005TheCE,
  title={The convoluted evolution of snail chirality},
  author={Menno Schilthuizen and Angus Davison},
  journal={Naturwissenschaften},
  year={2005},
  volume={92},
  pages={504-515}
}
The direction that a snail (Mollusca: Gastropoda) coils, whether dextral (right-handed) or sinistral (left-handed), originates in early development but is most easily observed in the shell form of the adult. Here, we review recent progress in understanding snail chirality from genetic, developmental and ecological perspectives. In the few species that have been characterized, chirality is determined by a single genetic locus with delayed inheritance, which means that the genotype is expressed… 

Chiral Speciation in Terrestrial Pulmonate Snails

The fossil record and the recent fauna suggest that successful reversals in coiling direction occurred with a frequency of once every three to four million years for the Clausiliidae, and Turkey is nevertheless exceptional by both a high percentage of sinistral species and a high number of speciation events resulting in mirror image species.

The ecology of shell shape difference in chirally dimorphic snails

It is confirmed that hatchlings also differ in shell shape and field studies to compare dextral and sinistral juveniles and adults for direction and rate of dispersal within the vegetation and micro-niche occupation failed to detect any difference in both ecological traits.

Shells and heart: Are human laterality and chirality of snails controlled by the same maternal genes?

It is proposed that an evolutionarily conserved genetic basis of chirality (the same that controls left–right asymmetry in snails) is a major synapomorphy of the Bilateria.

Mapping of dextral : sinistral proportions in the chirally dimorphic land snail Amphidromus inversus

This study mapped the proportions of sinistrals in 56 demes in A. inversus on the Malaysian island of Kapas and found no overwhelming evidence for a role for drift in explaining the deviations from equal S:D proportions.

Fine Mapping of the Pond Snail Left-Right Asymmetry (Chirality) Locus Using RAD-Seq and Fibre-FISH

The power of new genomic approaches for identification of the chirality gene, “D” is demonstrated and combining genomic technologies, such as RAD-Seq and high resolution FISH, is a robust approach for mapping key loci in non-model systems.

Multiple reversals of chirality in the land snail genus Albinaria (Gastropoda, Clausiliidae)

The fragmented population structure in Albinaria facilitates genetic drift and contributes to fixation of the opposite chirality and overcoming of the mating disadvantage of left–right reversal.

Speciation and Gene Flow between Snails of Opposite Chirality

The results imply that speciation by chiral reversal is only meaningful in the context of a complex biogeographical process, and so must usually involve other factors.

Sinistral snail shells in the sea: developmental causes and consequences

The common and widespread – while geologically short-lived – fossil shells of C. adversarius show large amounts of variability in form and this variation may be related, at least in part, to a pleiotropic effect associated with the reversed coiling direction of this species.

Opposite shell-coiling morphs of the tropical land snail Amphidromus martensi show no spatial-scale effects

Testing morph-clustering of empty shells at two spatial scales in Amphidromus martensi populations in northern Borneo shows that consistent clustering or separation of morphs cannot be clearly detected at any spatial scale and that predation is not frequency-dependent.
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