“…Although Pigati et al (2010) claim that larger snails would require to scrape limestone to fulfill their need for calcium, none of the large snails from the Megalobulimus genera (e.g. up to 105 mm in length for the Megalobulimus paranaguensis reported by Miranda and Fontenelle 2015) from Macario et al (2016a) work has shown signs of dead carbon incorporation.…”
Section: Resultsmentioning
confidence: 99%
“…Both genera have detritivorous-herbivorous diet, feeding from the leaves of trees and shrubs. They have nocturnal habits, hiding below the leaf coverage in soil during the day and dormancy periods (Bequaert 1948; Morretes 1952; Miranda and Fontenelle 2015; Cavallari pers. communication). Figure 1 Land snails’ abundance at the Usiminas shellmound.…”
Among other zooarchaeological remains, terrestrial snails’ shells from the Thaumastus and Megalobulimus genera are found in some Brazilian shellmounds, presenting a potential substitute for charcoal in radiocarbon dating analyses, as reliable representatives of the atmospheric carbon isotopic ratio. In this paper, we present statistically similar results of both charcoal and land snails samples from the same archaeological contexts in three settlements on the coast of Rio de Janeiro. The Manitiba I shellmound results range from 4.2 to 3.7 ka cal BP (95.4%), contemporary with the Saquarema shellmound, occupied during the period from 4.3 to 3.6 ka cal BP (95.4%). For the Usiminas shellmound, two groups of samples revealed different periods of time for two occupational layers from 2.3 to 2.1 ka cal BP (95.4%) and from 1.6 and 1.3 ka cal BP (95.4%). A model constraining each group of samples to within a single phase has a general agreement of 97% with only two outliers out of 22 dates, yielding minimum individual agreement of 74% and 7% posterior outlier probability for Saquarema shells. These are good examples of sites in which the occupation chronology can be successfully obtained by the radiocarbon dating of land snails.
“…Although Pigati et al (2010) claim that larger snails would require to scrape limestone to fulfill their need for calcium, none of the large snails from the Megalobulimus genera (e.g. up to 105 mm in length for the Megalobulimus paranaguensis reported by Miranda and Fontenelle 2015) from Macario et al (2016a) work has shown signs of dead carbon incorporation.…”
Section: Resultsmentioning
confidence: 99%
“…Both genera have detritivorous-herbivorous diet, feeding from the leaves of trees and shrubs. They have nocturnal habits, hiding below the leaf coverage in soil during the day and dormancy periods (Bequaert 1948; Morretes 1952; Miranda and Fontenelle 2015; Cavallari pers. communication). Figure 1 Land snails’ abundance at the Usiminas shellmound.…”
Among other zooarchaeological remains, terrestrial snails’ shells from the Thaumastus and Megalobulimus genera are found in some Brazilian shellmounds, presenting a potential substitute for charcoal in radiocarbon dating analyses, as reliable representatives of the atmospheric carbon isotopic ratio. In this paper, we present statistically similar results of both charcoal and land snails samples from the same archaeological contexts in three settlements on the coast of Rio de Janeiro. The Manitiba I shellmound results range from 4.2 to 3.7 ka cal BP (95.4%), contemporary with the Saquarema shellmound, occupied during the period from 4.3 to 3.6 ka cal BP (95.4%). For the Usiminas shellmound, two groups of samples revealed different periods of time for two occupational layers from 2.3 to 2.1 ka cal BP (95.4%) and from 1.6 and 1.3 ka cal BP (95.4%). A model constraining each group of samples to within a single phase has a general agreement of 97% with only two outliers out of 22 dates, yielding minimum individual agreement of 74% and 7% posterior outlier probability for Saquarema shells. These are good examples of sites in which the occupation chronology can be successfully obtained by the radiocarbon dating of land snails.
“…Rubin, Likins & Berry 12 claim that major inputs of limestone-derived carbon come from ingestion, followed by dissolution in the gut and diffusion into the hemolymph, or from uptake of limestone dissolved in secretions through the foot 17 38 . Considering the observed results, we excluded the possibility of the incorporation of old carbon by most of the studied herbivorous terrestrial snails of Thaumastus and Megalobulimus 22 39 . According to the distribution of the karst regions in Brazil 40 , most of the studied sites present potential availability of carbonate rocks.…”
In Brazilian archaeological shellmounds, many species of land snails are found abundantly distributed throughout the occupational layers, forming a contextualized set of samples within the sites and offering a potential alternative to the use of charcoal for radiocarbon dating analyses. In order to confirm the effectiveness of this alternative, one needs to prove that the mollusk shells reflect the atmospheric carbon isotopic concentration in the same way charcoal does. In this study, 18 terrestrial mollusk shells with known collection dates from 1948 to 2004 AD, around the nuclear bombs period, were radiocarbon dated. The obtained dates fit the SH1-2 bomb curve within less than 15 years range, showing that certain species from the Thaumastus and Megalobulimus genera are reliable representatives of the atmospheric carbon isotopic ratio and can, therefore, be used to date archaeological sites in South America.
“…As espécies do gênero Megalobulimus, em particular, são popularmente conhecidas como "aruás-do-mato". O conhecimento, principalmente ao que se refere à ecologia e biologia desses animais é escasso, mas sabe-se que possuem baixa densidade populacional e baixo potencial reprodutivo (Miranda & Fontenelle, 2015). Assim, o estudo desses animais emblemáticos da fauna sul-americana é de grande importância para melhor compreensão sobre sua biologia, ecologia e comportamento, sendo sua preservação o objetivo a longo prazo, uma vez que sofrem constantemente com a degradação do ambiente e, possivelmente, pela competição com a espécies exótica Achatina fulica (Férussac, 1821), o caramujo-giganteafricano (Fontenelle & Miranda, 2012).…”
Section: Gastropoda Terrestres E Dulciaquícolasunclassified
“…A subfamília Megalobuliminae, atualmente alocada na família Strophocheilidae (Bouchet, 2017), compreende aproximadamente 80 espécies válidas, com distribuição endêmica para América do Sul e aproximadamente 60 espécies válidas para o Brasil (Simone, 2006;Fontenelle et al, 2019). Os indivíduos pertencentes à família são herbívoros, noturnos, e passam por períodos de dormência; têm por preferência se manterem protegidos e úmidos, cobertos por vegetação ou húmus/solo solto durante o dia (Bequaert, 1948;Miranda & Fontenelle, 2015 Megalobulimus, Strophocheilus, Speironepion Bequaert, 1948, Microborus Pilsbry, 1926, e Chiliborus Pilsbry, 1926. Morretes (1952 Strophocheilinae e Megalobuliminae dentro da superfamília Rhytidoidea (Bouchet et al, 2017).…”
Section: Gênero Megalobulimus Miller 1878unclassified
Levantamento e sinopse taxonômica da malacofauna terrestre e de água doce de quatro munícipios do Centro-Sul Baiano, com ênfase no gênero Megalobulimus Miller, 1878 Survey and taxonomic synopsis of the terrestrial and freshwater malacofauna of four municipalities of the Center-South of Bahia with emphasis on the genus Megalobulimus Miller, 1878
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