First record of striking sexual dimorphism in two terrestrial caenogastropods

Páll‐Gergely, Barna; Hunyadi, András; Otani, Jamen Uiriamu; Ablett, Jonathan D.

doi:10.1093/mollus/eyaa005

Cited by 8 publications

(9 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sexual dimorphism in animals, a pattern in which males and females of the same species differ in some trait, is a common feature among many gonochoric taxa; it is exhibited in a variety of ways (Berns, 2013;Páll-Gergely et al, 2020). However, in Caenogastropoda, a very large and diverse group which includes H. atacamensis, external sexual dimorphism is commonly absent (Páll-Gergely et al, 2020). In the present study, the analysis of shell variables did not reveal statistically significant differences between males and females.…”

Section: Discussionmentioning

confidence: 99%

Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Collado

Chihuailaf²,

Muñoz-Herrera³

et al. 2021

PeerJ

View full text Add to dashboard Cite

Knowing the reproductive biology of threatened species is essential for conservation and to establish proper management plans. Heleobia atacamensis, a freshwater snail only known from two locations in the Atacama Saltpan, northern Chile, is currently classified as Data Deficient on the IUCN Red List and Critically Endangered by the Ministerio del Medio Ambiente of Chile. Based on size-frequency distribution, multivariate analysis of shell measurements, and microdissections, we studied the reproductive strategy, recruitment period, sex ratio and sexual dimorphism in this species. Heleobia atacamensis is an oviparous species, with direct development (non-planktotrophic). Females lay capsules of a single egg from which a juvenile resembling a miniature adult hatches after intracapsular metamorphosis is completed. The development type was confirmed by the observation of a paucispiral protoconch (= protoconch I) using scanning electron microscopy. Recruitment was observed across the four seasons of the year, with an increment at the end of austral summer. Results also showed that sex ratio was 1:1, whereas sexual dimorphism was not detected using univariate and multivariate analysis of the shell. The reproductive data provided in this study are a starting point for future management plans.

show abstract

Section: Discussionmentioning

confidence: 99%

Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Collado

Chihuailaf²,

Muñoz-Herrera³

et al. 2021

PeerJ

View full text Add to dashboard Cite

show abstract

“…perlucidum population, this may not be noticeable even when comparing the shells of both sexes side by side. Páll-Gergely et al (2020) pointed out that these differences can only be revealed when rigorous statistical methods are used, as is the case in most other studies.…”

Section: Discussionmentioning

confidence: 99%

“…Females have larger shells than males despite shell size variations. To date, only a handful of land snail studies have investigated the size variations between both sexes, and all studies showed that females are more slender and larger than males ( Gofas, 2001 ; Reichenbach, Baur & Neubert, 2012 ; Páll-Gergely et al, 2020 ). Although females can be at least 6% (∼1mm) larger than males in the same L .…”

Section: Discussionmentioning

confidence: 99%

“…Because shell size and shape are often used as diagnostic characteristics in species’ taxonomy, it is important to understand the effects of sexual dimorphism on these traits. Sexual dimorphism can be observed in a shell’s surface ornamentations ( Dutta et al, 2017 ), size ( Jokinen, Guerette & Kortmann, 1982 ; Son, 1997 ; Estebenet & Cazzaniga, 1998 ; Glöer, Albrecht & Wilke, 2007 ; Pastorino, 2007 ; Kurata & Kikuchi, 2000 ; Son & Hughes, 2000 ; Minton & Wang, 2011 ; Ng et al, 2019 ; Páll-Gergely et al, 2020 ), shape ( Jokinen, Guerette & Kortmann, 1982 ; Keawjam, 1987 ; Son & Hughes, 2000 ; Minton & Wang, 2011 ; Márquez & Averbuj, 2017 ), and pigmentation ( Gofas, 2001 ; Schilthuizen, Sipman & Zwaan, 2017 ). The driving forces that cause dimorphisms in shell characteristics are generally related to reproductive selection ( Pastorino, 2007 ; Collin, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

“…To our knowledge, sexual dimorphism in shell size and shape of terrestrial caenogastropod shells has only been studied in five genera: Cochlostoma , Obscurella , Plectostoma , Barnaia, and Streptaulus ( Raven, 1990 ; Gofas, 2001 ; Schilthuizen et al, 2003 ; Reichenbach, Baur & Neubert, 2012 ; Páll-Gergely et al, 2020 ). With the exception of Plectostoma , these species studied so far have elongate conical shells where female shells are more slender than males.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sexual dimorphism in shell size of the land snail Leptopoma perlucidum (Caenogastropoda: Cyclophoridae)

Phung

Choo

Liew

2022

PeerJ

View full text Add to dashboard Cite

Sexual dimorphism in the shell size and shape of land snails has been less explored compared to that of other marine and freshwater snail taxa. This study examined the differences in shell size and shape across both sexes of Leptopoma perlucidum land snails. We collected 84 land snails of both sexes from two isolated populations on two islands off Borneo. A total of five shell size variables were measured: (1) shell height, (2) shell width, (3) shell spire height, (4) aperture height, and (5) aperture width. We performed frequentist and Bayesian t-tests to determine if there was a significant difference between the two sexes of L. perlucidum on each of the five shell measurements. Additionally, the shell shape was quantified based on nine landmark points using the geometric morphometric approach. We used generalised Procrustes and principal component analyses to test the effects of sex and location on shell shape. The results showed that female shells were larger than male shells across all five measurements (all with p-values < 0.05), but particularly in regards to shell height and shell width. Future taxonomic studies looking to resolve the Leptopoma species’ status should consider the variability of shell size caused by sexual dimorphism.

show abstract

Mother snail labors for posterity in bed of mid-Cretaceous amber

Jochum

Neubauer

2021

Gondwana Research

View full text Add to dashboard Cite

First record of striking sexual dimorphism in two terrestrial caenogastropods

Cited by 8 publications

References 12 publications

Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Sexual dimorphism in shell size of the land snail Leptopoma perlucidum (Caenogastropoda: Cyclophoridae)

Mother snail labors for posterity in bed of mid-Cretaceous amber

Contact Info

Product

Resources

About