Molecular Phylogeny, Evolution of Shell Shape, and DNA Barcoding in Polygyridae (Gastropoda: Pulmonata), an Endemic North American Clade of Land Snails

Perez, Kathryn E.; Defreitas, Nicholas A; Slapcinsky, John; Minton, Russell L.; Anderson, Frank E.; Pearce, Timothy A.

doi:10.4003/006.032.0103

Cited by 24 publications

(17 citation statements)

References 70 publications

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“…Many of the most visible and commonly encountered land snails in North America are polygyrids. Nearly 300 species are described in the family, including five that are considered problematic invasives (Perez et al 2014). We focused our efforts on Praticolella mexicana Perez, 2011, a small, globe-shaped snail (Figure 1) most likely native to Mexico and introduced to the Caribbean and the United States gulf coast (Perez 2011).…”

Section: Introductionmentioning

confidence: 99%

Two complete mitochondrial genomes from Praticolella mexicana Perez, 2011 (Polygyridae) and gene order evolution in Helicoidea (Mollusca, Gastropoda)

Minton¹,

Cruz²,

Farman³

et al. 2016

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Helicoidea is a diverse group of land snails with a global distribution. While much is known regarding the relationships of helicoid taxa, comparatively little is known about the evolution of the mitochondrial genome in the superfamily. We sequenced two complete mitochondrial genomes from Praticolella mexicana Perez, 2011 representing the first such data from the helicoid family Polygyridae, and used them in an evolutionary analysis of mitogenomic gene order. We found the mitochondrial genome of Praticolella mexicana to be 14,008 bp in size, possessing the typical 37 metazoan genes. Multiple alternate stop codons are used, as are incomplete stop codons. Mitogenome size and nucleotide content is consistent with other helicoid species. Our analysis of gene order suggested that Helicoidea has undergone four mitochondrial rearrangements in the past. Two rearrangements were limited to tRNA genes only, and two involved protein coding genes.

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Section: Introductionmentioning

confidence: 99%

Two complete mitochondrial genomes from Praticolella mexicana Perez, 2011 (Polygyridae) and gene order evolution in Helicoidea (Mollusca, Gastropoda)

Minton¹,

Cruz²,

Farman³

et al. 2016

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“…Variations in chromosome number and morphology in the Helicoidea superfamily, and more in general in Eupulmonata, are considered taxonomically relevant and have been highly debated in past studies, with some authors suggesting a progressive reduction of the chromosome number [ 9 , 67 ], while others supporting the opposite hypothesis [ 16 , 60 ]. In this regard, to evaluate the evolutionary trends of karyotype variations in the studied taxa, we superimposed on the evolutionary relationships of the Helicoidea of the Western Palearctic [ 9 , 10 , 14 ] all the available chromosome data as listed in Table S1 , with an updated nomenclature following WoRMS [ 1 ] and MolluscaBase [ 2 ] ( Figure 6 ).…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Helicoidea, due to their peculiar natural history and historical biogeography, are interesting models for studies on evolutionary dynamics, and recent molecular works have started to provide more accurate representations of their evolutionary relationships (e.g., [ 10 , 11 , 12 , 13 ]). This is particularly true for several families and subfamilies, whose phylogenetic relationships have been described in several focused works (e.g., [ 10 , 13 , 14 ]), and more in general for the Helicoidea of the Western Palearctic, whose classification and phylogeny have been recently revised [ 9 ]. In particular, Razkin et al [ 9 ] proposed an updated classification and phylogenetic relationships of the western Palearctic Helicoidea, confirming the taxonomic validity of many morphologically defined families and re-defining the systematic boundaries of many different groups respecting the monophyly of families, subfamilies, and tribes [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Chromosome Diversity and Evolution in Helicoide a (Gastropoda: Stylommatophora): A Synthesis from Original and Literature Data

Petraccioli

Crovato

Guarino

et al. 2021

Animals

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We performed a molecular and a comparative cytogenetic analysis on different Helicoidea species and a review of all the available chromosome data on the superfamily to provide an updated assessment of its karyological diversity. Standard karyotyping, banding techniques, and Fluorescence in situ hybridization of Nucleolus Organizer Region loci (NOR-FISH) were performed on fifteen species of three families: two Geomitridae, four Hygromiidae and nine Helicidae. The karyotypes of the studied species varied from 2n = 44 to 2n = 60, highlighting a high karyological diversity. NORs were on a single chromosome pair in Cernuella virgata and on multiple pairs in four Helicidae, representing ancestral and derived conditions, respectively. Heterochromatic C-bands were found on pericentromeric regions of few chromosomes, being Q- and 4′,6-diamidino-2-phenylindole (DAPI) negative. NOR-associated heterochromatin was C-banding and chromomycin A3 (CMA3) positive. Considering the available karyological evidence on Helicoidea and superimposing the chromosome data gathered from different sources on available phylogenetic inferences, we describe a karyotype of 2n = 60 with all biarmed elements as the ancestral state in the superfamily. From this condition, an accumulation of chromosome translocations led to karyotypes with a lower chromosome number (2n = 50–44). This process occurred independently in different lineages, while an augment of the chromosome number was detectable in Polygyridae. Chromosome inversions were also relevant chromosome rearrangements in Helicoidea, leading to the formation of telocentric elements in karyotypes with a relatively low chromosome count.

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“…Rates of mitochondrial gene evolution for land snails vary considerably, with estimates of 1.6-12.9% per million years for ribosomal genes and 2.8-13% for CO1 (Thomaz et al 1996, Chiba 1999, Van Riel et al 2005. Further, land snails often exhibit high levels of intraspecific genetic divergence and population structure (Guiller et al 1994, Davison et al 2009, Perez et al 2014). An estimated 1.6% divergence per million years has been a proposed standard for other gastropods (Liu and Hershler 2007, Murphy et al 2012, Harris et al 2013.…”

Section: Genetic Diversity Of Helicodiscus Barrimentioning

confidence: 99%

Morphometrics and phylogeography of the cave-obligate land snail Helicodiscus barri (Gastropoda, Stylommatophora, Helicodiscidae)

Gladstone¹,

Niemiller²,

Pieper³

et al. 2019

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Molecular studies have recently led to the detection of many cryptic species complexes within morphologically ambiguous species formerly undescribed by the scientific community. Organisms such as land snails are at a particularly higher risk of species misidentification and misinterpretation, in that gastropod systematics are based almost entirely on external shell morphology. Subterranean ecosystems are associated with especially high degrees of cryptic speciation, largely owing to the abiotic similarities of these systems. In this study, we attempt to diagnose the potential cryptic diversity in the troglobitic land snail Helicodiscus barri. Land snails are generally associated with having low vagility, and as such this species' broad, mosaic distribution indicates the misdiagnosis of this organism as a single species. We analyze both mitochondrial (16S, CO1) and nuclear (28S, H3) genetic data for 23 populations. Phylogeny for H. barri was reconstructed using both maximum-likelihood and Bayesian approaches to assess relationships among populations, and two species delimitation methods (mPTP and ABGD) were used to detect the presence of unique molecular operational taxonomic units (MOTUs). Species delimitation results revealed seven and sixteen MOTUs respectively, suggesting the presence of several cryptic lineages within H. barri. To assess how external shell morphology corresponds with patterns of genetic and environmental variation, two morphometric approaches were used incorporating 115 shells from 31 populations. Both morphometric approaches reveal a significant environmental influence on shell morphology, and one approach showed the significance of MOTU groups. We discuss the delimitation and morphometric results and additionally provide discussion on the taxonomic and conservation implications of this study.A peer-reviewed open-access journal Nicholas S. Gladstone et al. / Subterranean Biology 30: 1-32 (2019) 2

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Molecular Phylogeny, Evolution of Shell Shape, and DNA Barcoding in Polygyridae (Gastropoda: Pulmonata), an Endemic North American Clade of Land Snails

Cited by 24 publications

References 70 publications

Two complete mitochondrial genomes from Praticolella mexicana Perez, 2011 (Polygyridae) and gene order evolution in Helicoidea (Mollusca, Gastropoda)

Two complete mitochondrial genomes from Praticolella mexicana Perez, 2011 (Polygyridae) and gene order evolution in Helicoidea (Mollusca, Gastropoda)

Chromosome Diversity and Evolution in Helicoide a (Gastropoda: Stylommatophora): A Synthesis from Original and Literature Data

Morphometrics and phylogeography of the cave-obligate land snail Helicodiscus barri (Gastropoda, Stylommatophora, Helicodiscidae)

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