Molecular phylogeny of the land snail genus<i>Alopia</i>(Gastropoda: Clausiliidae) reveals multiple inversions of chirality

Fehér, Zoltán; Németh, László; Nicoară, Alexandru; Szekeres, Miklós

doi:10.1111/zoj.12002

Cited by 22 publications

(47 citation statements)

References 39 publications

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“…The deep split between A. straminicollis and A. livida was also shown in the mitochondrial gene tree of Fehér et al. () that furthermore demonstrated that these taxa are among the phylogenetically most distant Alopia taxa. However, Fehér et al.…”

Section: Discussionmentioning

confidence: 61%

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High gene flow despite opposite chirality in hybrid zones between enantiomorphic door snails

et al. 2017

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We studied differentiation and geneflow patterns between enantiomorphic door-snail species in two hybrid zones in the Bucegi Mountains (Romania) to investigate the effects of intrinsic barriers (complications in copulation) and extrinsic selection by environmental factors. A mitochondrial gene tree confirmed the historical separation of the examined populations into the dextral Alopia livida and the sinistral Alopia straminicollis in accordance with the morphological classification, but also indicated gene flow between the species. By contrast, a network based on amplified fragment length polymorphisms (AFLP) markers revealed local groups of populations as units independent of their species affiliation. Admixture analyses based on AFLP data showed that the genomes of most individuals in the hybrid zones are composed of parts of the genomes of both parental taxa. The introgression patterns of a notable fraction of the examined markers deviated from neutral introgression. However, the patterns of most non-neutral markers were not concordant between the two hybrid zones. There was also no concordance between non-neutral markers in the two genomic clines and markers that were correlated with environmental variables or markers that were correlated with the proportion of dextral individuals in the populations. Neither extrinsic selection by environmental factors nor intrinsic barriers resulting from positive frequency-dependent selection of the prevailing coiling direction were sufficient to maintain the distinctness of A. straminicollis and A. livida. Despite being historically separated units, we conclude that these taxa now merge where they come into contact.

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Section: Discussionmentioning

confidence: 61%

“…However, Fehér et al. () did not find that there is nevertheless an extensive exchange of mitochondrial haplotypes between these taxa, likely because they sampled only few specimens per species.…”

Section: Discussionmentioning

confidence: 99%

High gene flow despite opposite chirality in hybrid zones between enantiomorphic door snails

et al. 2017

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“…Thus, the effective small population size in terrestrial pulmonates can result in an isolated group of individuals differing merely in chirality, either in alloparty or parapatry. In high‐spired pulmonates, such as the present Cristataria , as well as Alopia , Albinaria (Fehér et al., ; Kornilios et al., ) and Partula (Johnson et al., ), gene flow would continue between enantiomorphic pairs of populations where they meet because of their copulation mode, unless additional reproductive barriers evolve. Such taxon pairs may accordingly represent chiral morphs or subspecies, as suggested in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…Using a clock‐like mutation rate of 8.6% per million years, Fehér et al. () estimated that the earliest divergence in Alopia took place between 0.8 and 1.6 million years ago (Mya) during the mid‐Pleistocene. According to the same study, the divergences within the subgenera of Carinigera , Carinigera and Nymphogena , respectively, occurred 2.2–5.0 Mya and 2.3–5.4 Mya, in the late Pliocene.…”

Section: Discussionmentioning

confidence: 99%

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Evolution of a dextral lineage by left-right reversal inCristataria(Gastropoda, Pulmonata, Clausiliidae)

Páll‐Gergely

Szekeres

Fehér

et al. 2019

J Zool Syst Evol Res

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It has long been debated whether mirror image‐like similarity in shell morphology between enantiomorphic pairs of dextral and sinistral taxa represents their sister relationship, or each of them is closer related to other congeners with the same coiling direction. The obligate rock‐dwelling genus Cristataria Vest, 1867 of the eastern Mediterranean region belongs to the Alopiinae subfamily of door snails (Clausiliidae). Cristataria and a few other genera of this subfamily include enantiomorphic pairs that are conchologically very similar to each other. Dextral C. colbeauiana (Pfeiffer, 1861) and its sinistral counterpart of such an enantiomorphic pair occur nearby one another in southern Turkey. However, the latter has been classified either as the sinistral subspecies C. colbeauiana inversa Szekeres, 1998 or as a form of sinistral C. leprevieri (Pallary, 1922). To examine the phylogenetic relationship of this enantiomorphic pair, we carried out molecular phylogenetic analysis of all the Turkish and two other Cristataria taxa based on both mitochondrial and nuclear DNA markers. Our results show that dextral C. colbeauiana and its sinistral counterpart are closest related to one another. This supports the classification of this enantiomorphic pair as dextral C. colbeauiana colbeauiana and sinistral C. colbeauiana inversa. Our results also reveal that these taxa and C. intersita Németh & Szekeres, 1995, sharing a characteristic collar behind the aperture of the shell, represent a monophyletic lineage. By contrast, the Cristataria species of non‐collared shells belong to another clade.

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Single-gene speciation: Mating and gene flow between mirror-image snails

et al. 2017

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Impact SummaryAlthough most snails have a right-handed spiraling shell, rare "mirror-image" individuals have a shell that coils to the left. This curious inherited condition has attracted attention because the genitals of mirror image snails are on different sides of the head, and so mating is difficult or impossible. If they are unable to mate, then does a change in the direction of the shell coil make a new species? In investigating a Japanese snail genus, Euhadra, we were surprised to find that different-coiling individuals can sometimes mate, against expectations, and that there is evidence for this in their genetic make-up. It turns out that the mating problem is mainly behavioral, rather than a physical incompatibility. This new work therefore suggests that the two types of Japanese snail should be considered a single species, and has implications for the classification of other snail species. As it is has previously been shown that the same sets of genes that make mirror image snails are also involved in making mirror image bodies in other animalsincluding humans-then further research using the natural variation snails could offer the chance to develop an understanding of how organs are placed in the body and why this process can sometimes go wrong.

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Molecular phylogeny of the land snail genusAlopia(Gastropoda: Clausiliidae) reveals multiple inversions of chirality

Cited by 22 publications

References 39 publications

High gene flow despite opposite chirality in hybrid zones between enantiomorphic door snails

High gene flow despite opposite chirality in hybrid zones between enantiomorphic door snails

Evolution of a dextral lineage by left-right reversal inCristataria(Gastropoda, Pulmonata, Clausiliidae)

Single-gene speciation: Mating and gene flow between mirror-image snails

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