Shell morphology of the freshwater snail Gundlachia ticaga (Gastropoda: Ancylidae) from four sites in Ilha Grande, southeastern Brazil

Lacerda, Luiz Eduardo Macedo de; Miyahira, Igor Christo; Santos, Sonia Barbosa dos

doi:10.1590/s1984-46702011000300007

Cited by 10 publications

(7 citation statements)

References 9 publications

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“…The shells do not show radial striae and are relatively high (Figure 4j, k), resembling some of the shell variations shown by Lacerda et al (2011). The intensity of the mantle pigmentation is highly variable, and may be absent in the smallest specimens ( Figure 4l); and the right anterior adductor muscle scar may be slightly almond-shaped.…”

Section: Remarksmentioning

confidence: 62%

Diversity and distribution of mollusks along the Contas River in a tropical semiarid region (Caatinga), Northeastern Brazil

Kotzian

Amaral

2013

Biota Neotrop.

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An inventory of macroinvertebrates conducted in the Contas River basin in Northeastern Brazil found 13 species of freshwater mollusks. Most of the community was represented by pulmonate gastropods, including Physa acuta, Drepanotrema anatinum, D. cimex, D. lucidum, Biomphalaria straminea?, Gundlachia radiata?, G. ticaga and Hebetancylus moricandi; the prosobranchs Pomacea archimedis?, Melanoides tuberculata and Littoridina sp. were also found. Bivalves were less diversified, represented only by Pisidium pulchellum? and Eupera simoni?. The taxonomic composition and the small size of many species reflect the intermittent condition of the basin. Additionally, the occurrence of shells of five terrestrial species (Helicina angulata, Gastrocopta pellucida hordeacella?, Beckianum beckianum, Succinea sp. and Systrophiidae gen. et sp. indet.) in the rivers reflects the occasional heavy rainfalls and floods in the region. The invasive gastropod M. tuberculata was the most abundant and widely distributed species. All 13 species were found in the lower course, in the Atlantic Forest region, and most, but not all, were recorded in the upper course, in the Caatinga region. The distribution and the occurrence of the bivalve species exclusively in the Atlantic Forest region indicate that the locally higher annual precipitation provides favorable conditions for the survival of these mollusks, such as a more stable hydroperiod. Resumo: Treze espécies de moluscos de água doce foram encontradas em um inventário de macroinvertebrados realizado ao longo da bacia do Rio de Contas, no Nordeste do Brasil. A maioria da comunidade foi representada por gastrópodes pulmonados, como Physa acuta, Drepanotrema anatinum, D. cimex, D. lucidum, Biomphalaria straminea?, Gundlachia radiata?, G. ticaga e Hebetancylus moricandi, embora prosobrânquios, como Pomacea archimedis?, Melanoides tuberculata e Littoridina sp. também tenham sido encontrados. Bivalves foram menos diversificados, e foram representados por Pisidium pulchellum? e Eupera simoni?. A composição taxonômica e o pequeno tamanho alcançado por muitas espécies refletem a condição intermitente da bacia. Além disso, a ocorrência de conchas de cinco espécies terrestres (Helicina angulata, Gastrocopta pellucida hordeacella?, Beckianum beckianum, Succinea sp. e Systrophiidae gen. et sp. indet.) dentro dos rios reflete as fortes chuvas e inundações que ocorrem ocasionalmente na região. O gastrópode invasor M. tuberculata foi a espécie mais abundante e bem distribuída. Todas as espécies foram encontradas no curso inferior, na região da Mata Atlântica, e a maioria, mas não todas, foram registradas no curso superior, na região da Caatinga. Esta distribuição e a ocorrência das espécies de bivalves exclusivamente na região da Mata Atlântica indicam que a maior precipitação anual desta região fornece condições favoráveis para a sobrevivência destes moluscos, como um hidroperíodo mais estável. Palavras-chave: Região Neotropical, Mata Atlântica, rios intermitentes, moluscos invasores, Bahia.

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Section: Remarksmentioning

confidence: 62%

Diversity and distribution of mollusks along the Contas River in a tropical semiarid region (Caatinga), Northeastern Brazil

Kotzian

Amaral

2013

Biota Neotrop.

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“…Physa acuta attained high population sizes and occurs with other molluscs on this stream like M. tuberculata, B. tenagophila, G. ticaga, O. matheroni, F. fragilis, andP. punctiferum (Santos et al, 2007, 2010;Lacerda et al, 2011;Braga et al, 2014). The effect of P. acuta over the other molluscs was not evaluated in this study, but a negative effect of the invasive M. tuberculata over P. punctiferum was previously observed on the same stream (Braga et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Despite these two last species were native elsewhere in the state of Rio de Janeiro, their local introduction was observed or inferred to Ilha Grande. There are also some native molluscs reported to the island: Uncancylus concentricus (d´Orbigny, 1835), Gundlachia ticaga (Marcus and Marcus, 1962), and Pisidium punctiferum (Guppy, 1867) (Santos et al, 2007(Santos et al, , 2009Lacerda et al, 2011Lacerda et al, , 2015Braga et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

The introduction of Physa acuta (Gastropoda: Physidae) on Ilha Grande, Southeast Brazil, from initial stages to an established population

et al. 2023

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This study presents a four-year follow-up of an introduced population of Physa acuta Draparnaud, 1805, from initial stages to an established population. This introduction occurred on a small impacted stream of Vila do Abraão, the main village of Ilha Grande (Angra dos Reis, Rio de Janeiro, Brazil). The population size increased during the study, and presented a relationship to environmental factors, especially with rainfall. On the initial stages of introduction prevailed the smaller specimens, but on the overall, predominated the intermediate size classes. After less than a year, P. acuta becomes established on this stream and was possibly affecting the other species found on the stream. The information presented here is useful to understand the invasion process of invasive snails, as well as directing conservation efforts.

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“…Traditional shell morphometrics in molluscs is a common tool that has been used for various purposes: to show local or regional conchological variation (e.g. Chiu et al ., 2002; Preston & Roberts, 2007; Lacerda et al ., 2011); to explore ecological relationships, usually linking morphological variation to a specific set of environmental conditions (e.g. Branch & Marsh, 1978; McMahon & Whitehead, 1987; Lam & Calow, 1988; Matos et al ., 2020); to distinguish species, mainly in Gastropoda (e.g.…”

Section: Introductionmentioning

confidence: 99%

Morphometry of the shell in Scaphopoda (Mollusca): a tool for the discrimination of taxa

Souza

Caetano

2020

J. Mar. Biol. Ass.

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The alpha taxonomy of scaphopods is based mainly on the shell morphology, as it is for most molluscs. In the last three decades, the employment of morphometric variables of the shell in combination with statistics has considerably increased to aid species discrimination, but this has not been used above species level. In this study, a traditional morphometric approach was used to distinguish congeners, genera and families within the orders Dentallida and Gadilida. We studied 28 species of scaphopods from Brazil, belonging to 12 genera and five families. Twelve morphometric variables were measured, and a correlation test was done to select a set of variables without correlation as input data to perform a discriminant analysis. In the analysis of congeners, the discrimination power was high in both orders. Among the genera studied, the robustness of the analysis was drastically reduced in Dentaliida, while Gadilida maintained a high percentage of correct classifications. At the family level, both orders presented high percentages of correct classification, but the imbalance of cases for each taxon masks an inconsistent result. Based on our results, the morphometric approach was a useful tool to discriminate congeneric species of both orders and to discriminate the genera of Gadilida.

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Shell morphology of the freshwater snail Gundlachia ticaga (Gastropoda: Ancylidae) from four sites in Ilha Grande, southeastern Brazil

Cited by 10 publications

References 9 publications

Diversity and distribution of mollusks along the Contas River in a tropical semiarid region (Caatinga), Northeastern Brazil

Diversity and distribution of mollusks along the Contas River in a tropical semiarid region (Caatinga), Northeastern Brazil

The introduction of Physa acuta (Gastropoda: Physidae) on Ilha Grande, Southeast Brazil, from initial stages to an established population

Morphometry of the shell in Scaphopoda (Mollusca): a tool for the discrimination of taxa

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