Morphometric methods for the analysis and classification of gastropods: a comparison using Littorina littorea

Doyle, Darragh; Gammell, Martin P.; Nash, Róisín

doi:10.1093/mollus/eyy010

Cited by 23 publications

(31 citation statements)

References 56 publications

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“…Geometric morphometrics is a recent morphometric analysis method that is based on digitised landmarks of shells which was first introduced by Johnston et al (1991) . The use of geometric morphometrics has increased as an alternative for shell morphometric analysis that is widely accepted ( Doyle et al 2018 ; Dillon & Jacquemin 2015 ; Farman & Almukhtar 2015 ; Cruz et al . 2012 ).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, genetic analysis is very costly compared to morphometric analysis that requires analysis of data using available software and hardware such as thermal cycler and DNA sequencer. The usage of morphometric analysis has obtained wide acceptance in the current biological scene as it is increasingly used as a necessary complement to molecular studies due to its reasonable cost and tolerable resolving power of discrimination ( Doyle et al 2018 ). Therefore, morphometric and morphology studies are faster compared to genetic analysis that usually takes more time to produce results.…”

Section: Introductionmentioning

confidence: 99%

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Conchology Variations in Species Identification of Pachychilidae (Mollusca, Gastropoda, Cerithiodea) through Multivariate Analysis

Hamli

Hamed

Azmai

et al. 2020

TLSR

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Pachychilidae is one of the freshwater gastropod family which was previously known under the Potamididae and Thiaridae families. Studies on freshwater gastropods especially on conchcology examinantions are still inadequate compared to marine gastropods. Morphological and morphometric studies of gastropods are practically used to identify and differentiate between species and necessary to complement molecular studies due to its low cost and tolerable resolving power of discrimination. The aim of the current study is to provide information on morphological and morphometric characteristics of Pachychilidae in Bintulu, Sarawak stream. A total of 20 individuals from each species of Sulcospira testudinaria , Sulcospira schmidti, Brotia siamensis, and Tylomelania sp . from Pachychilidae familiy were collected at three different sites from a small stream within the Bintulu area. Fourteen measurement of shell morphometrics were converted into proportioned ratios and analysed for univariate and multivariate analysis. Three shell morphometric (Aperture width, AW; Whorl width, WW2; and, Interior anterior length, AINL) of Pachychilidae indicated significant differences ( P < 0.05) between species. However, multivariate analysis revealed that these shell morphometrics are pre-eminent factors to discriminate genus Sulcospira, Brotia and Tylomelania , as well as between Sulcospira species. This current study also suggests that these three characteristics are unique to Sulcospira species due to strong distinction among species. Findings on these three characteristics are significant for Sulcospira spp. as this study is the first shell morphometric report on the Pachychilidae species in Sarawak.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conchology Variations in Species Identification of Pachychilidae (Mollusca, Gastropoda, Cerithiodea) through Multivariate Analysis

Hamli

Hamed

Azmai

et al. 2020

TLSR

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“…Elliptic Fourier analysis was used to describe and quantify shell morphology (Williams et al 2012, Doyle et al 2018, Jackson & Claybourn 2018. Images of S. quadrata shells were acquired using a digital camera (K-S2, Ricoh, Japan), from which elliptic Fourier analysis was performed using SHAPE (Iwata & Ukai 2006).…”

Section: Quantification Of Shell Morphologymentioning

confidence: 99%

Phenotypic divergence in viviparid snails in a recently converted freshwater lagoon

Kagawa

Saito

Uchida

et al. 2019

Plankton Benthos Res

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Freshwater mollusks often show high intraspecific variability in shell morphology, which may cause incongruences between molecular phylogeny and morphology-based species taxonomy. However, it remains unclear how morphological variations in freshwater snails are associated with different habitats such as rivers, ponds, and lakes. In the present study, we investigated the morphological variation in the shells of the viviparid freshwater snail Sinotaia quadrata in the Kahoku Lagoon in Japan, which was converted from a brackish to a freshwater lagoon 60 years ago. This newly established freshwater habitat is particularly well-suited for studies on how morphology is associated with environments. We found clear differences in shell morphologies between the S. quadrata populations sampled inside and outside of the lagoon. The S. quadrata sampled in the lagoon had thicker and more elongated shells with wider apertures than those sampled outside of the lagoon. No relationship was found between shell morphology and the distance between sampling sites. This suggests that the divergence in shell morphology occurred over a fairly short time period by rapid adaptation or phenotypic plasticity. Although it is unclear whether these differences are caused by phenotypic plasticity or adaptation, the present findings suggest that the shell morphologies of freshwater snails easily change under the influence of the environment. The high flexibility in shell morphology should be carefully considered when managing or studying freshwater mollusks.

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“…Morphometry aims to quantify, analyse and describe the variations found in biological forms (Roth & Mercer, 2000). Despite the recent advances in genetics, morphological evaluation has still been an important tool for grouping and classifying species (Doyle et al ., 2018). In addition, morphometric data may offer an economical alternative to infer the fundamental biological parameters of populations, because body shape is a product of individual ontogeny (Walker & Grahame, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The intraspecific shell shape variation among littorinids has been described for different species such as Littorina spp. (Johannesson, 2003), Littorina saxatilis (Rolán-Alvarez, 2007), Littorina littorea (Doyle et al ., 2018), Echinolittorina australis (Johnson & Black, 1999), Littoraria angulifera (Merkt & Ellison, 1998; Tanaka & Maia, 2006) and Littoraria scabra (Silva et al ., 2013).…”

Section: Introductionmentioning

confidence: 99%

Morphometric analysis of the shell of the intertidal gastropod Echinolittorina lineolata (d'Orbigny, 1840) at different latitudes along the Brazilian coast

2020

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Morphometric analysis is one of the tools widely used to quantify, analyse and describe the variations in the biological forms of animals. In this study, we examined the linear morphometric variations of the shell of the small intertidal gastropod Echinolittorina lineolata and compared the patterns to identify variations among populations and between sexes. The individuals were collected from latitudes 3°S, 14°S, 21°S and 23°S along the Brazilian coast. Traditional morphometric analysis was performed, and the morphometric variables of the shells, namely, the length and width of the shell and the length and width of the shell opening were obtained. The observed size pattern was influenced by latitude, as well as by local spatial responses to factors such as the substrate changing the morphometric variables of the snail. Of the morphometric variables, the length and the width of the shell were the most representative variables that influenced the gastropods in the different latitudes. These variables were also different in males and females, with females having larger shell lengths and widths across all latitudes.

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Morphometric methods for the analysis and classification of gastropods: a comparison using Littorina littorea

Cited by 23 publications

References 56 publications

Conchology Variations in Species Identification of Pachychilidae (Mollusca, Gastropoda, Cerithiodea) through Multivariate Analysis

Conchology Variations in Species Identification of Pachychilidae (Mollusca, Gastropoda, Cerithiodea) through Multivariate Analysis

Phenotypic divergence in viviparid snails in a recently converted freshwater lagoon

Morphometric analysis of the shell of the intertidal gastropod Echinolittorina lineolata (d'Orbigny, 1840) at different latitudes along the Brazilian coast

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