Revalidation of Omalonyx convexus (Heynemann 1868) and emendation of the type locality of Omalonyx unguis (Orbigny 1837): (Mollusca: Gastropoda: Pulmonata: Succineidae)

Arruda, Janine Oliveira; Thomé, José Willibaldo

doi:10.1127/arch.moll/0003-9284/137/159-166

Cited by 9 publications

(23 citation statements)

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“…Morphological identification of specimens collected in our malacological surveys was based on characteristics of the reproductive system according to the following literature: O. convexus (Hylton-Scott & Lapuente 1968, Hylton-Scott 1971, Tillier 1981, Arruda & Thomé 2008b, O. unguis (Coscarelli & Vidigal 2011), O. matheroni, O. pattersonae and O. geayi (Tillier 1981). Specific identification provided in the papers (literature review) and on the labels (museum specimens) was also used in this work.…”

Section: Methodsmentioning

confidence: 99%

“…Corrientes is a city on the riverbank of the Paraná River in Argentina, very close to the frontier with Paraguay, which is defined by the Paraná River itself. Later, Asunción, in Paraguay, was considered to be the type locality for O. unguis (Arruda & Thomé 2008b).…”

Section: Literature Review: Omalonyx In Other South American Countriementioning

confidence: 99%

“…Based on specimens from the MCZ (lot number unavailable), Parodiz (1963) registered the occurrence of Omalonyx in Rio de Janeiro (O. unguis) and Camaquã, Rio Grande do Sul. The specimens from Camaquã were later identified as O. convexus (Arruda & Thomé 2008b . In a taxonomical review using specimens from institutional collections, Tillier (1981) studied animals from eight localities in Brazil.…”

Section: Literature Review: Omalonyx In Brazilmentioning

confidence: 99%

“…However, no other information about the locality was provided, and the morphology described in Gibbons (1879) is not compatible with O. unguis; thus these records were not included in Table 2. Omalonyx convexus was described by Martens (1968) as Succinea convexa from specimens collected in Porto Alegre, Rio Grande do Sul State, in southern Brazil (type locality), and it was later included in the genus Omalonyx (Arruda & Thomé 2008b). The map provided by Arruda and Thomé (2008b) shows overlapping distribution of O. convexus and O. unguis in the Argentinean region of the Paraná River basin (in Figure 1 the Paraná River basin is included in the Del Plata hydrographic region) and adjacent localities in Uruguay.…”

Section: Literature Review: Omalonyx In Brazilmentioning

confidence: 99%

“…Omalonyx convexus was described by Martens (1968) as Succinea convexa from specimens collected in Porto Alegre, Rio Grande do Sul State, in southern Brazil (type locality), and it was later included in the genus Omalonyx (Arruda & Thomé 2008b). The map provided by Arruda and Thomé (2008b) shows overlapping distribution of O. convexus and O. unguis in the Argentinean region of the Paraná River basin (in Figure 1 the Paraná River basin is included in the Del Plata hydrographic region) and adjacent localities in Uruguay. Omalonyx brasiliensis was described by Simroth (1896) based on specimens collected by H. von Ihering in Rio Grande do Sul State.…”

Section: Literature Review: Omalonyx In Brazilmentioning

confidence: 99%

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Predicting the distribution of Omalonyx (Mollusca: Pulmonata: Succineidae) species from literature review, museum databases and new sampling efforts in Brazil

et al. 2018

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Accurate distributional information is crucial for studies on systematics, biodiversity and conservation. To improve the knowledge regarding the geographical distribution of Omalonyx in South America, we present updated information based on data from a literature review, institutional collections and malacological surveys. All this information composed the dataset used to predict species distribution employing the Maximum Entropy Algorithm (MaxEnt). The model was run using data on species distribution, altitude and bioclimatic variables (WorldClim database). The model had consistent performance, and areas presenting similar conditions to areas where the species were recorded were considered areas of occurrence. The predicted occurrence areas included those that were already surveyed and those that are considered potential occurrence areas. The results demonstrate that the genus has widespread distribution in the Neotropical region and occurs in the tropical, temperate and arid regions of South America and Lesser Antilles. Omalonyx spp. were recorded in all South American countries and hydrographic regions. However, in some countries, there were only isolated records (ex: Colombia and Ecuador). Here, we also present the first record of Omalonyx spp. in four Brazilian States (Acre, Rondônia, Piaui, and Amapá). The genus was found in all hydrographic regions within Brazil and among 27 federative unities; it was absent from only two unities (Roraima State and Distrito Federal). This work contributes to the knowledge on Omalonyx spp. distribution and provides an important basis for the work of ecologists and taxonomists.

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Section: Methodsmentioning

confidence: 99%

Section: Literature Review: Omalonyx In Other South American Countriementioning

confidence: 99%

Section: Literature Review: Omalonyx In Brazilmentioning

confidence: 99%

Section: Literature Review: Omalonyx In Brazilmentioning

confidence: 99%

Section: Literature Review: Omalonyx In Brazilmentioning

confidence: 99%

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Predicting the distribution of Omalonyx (Mollusca: Pulmonata: Succineidae) species from literature review, museum databases and new sampling efforts in Brazil

et al. 2018

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Integrative taxonomy of the neotropical genus Omalonyx (Elasmognatha: Succineidae)

et al. 2018

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The genus Omalonyx d'Orbigny, 1837, includes neotropical semi‐aquatic succineid slugs and comprises six recognized species to date. Field surveys across continental South America recovered five of the six recognized species. According to the morphological characters traditionally included in Omalonyx descriptions, the specimens were tentatively identified as O. matheroni, O. pattersonae, O. convexus, O. geayi and O. unguis. Employing sequences of mitochondrial cytochrome oxidase I (COI) alone or combined with the nuclear second internal transcribed spacer (ITS2) in discovery methods of species delimitation (GMYC and STACEY) led to species delimitation hypotheses that, except for unambiguously supporting O. convexus, have no correspondence to morphologically based assignments. To choose the delimitation model that best fit our data, the hypotheses recovered by GMYC, STACEY and morphology and created by merging species recovered by those methods had their marginal likelihood estimated and compared using the Bayes factors. The best‐supported hypothesis distinguished two species besides O. convexus: one widespread over most of South America and the other restricted to Rio de Janeiro State, Brazil. Furthermore, the pattern of genetic structuring supports pathways connecting the Amazonian and Atlantic forests. This pattern is similar to that observed in terrestrial taxa (e.g., forest‐dwelling small mammals) and is different from the pattern for fully aquatic taxa.

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First record of the semi-slug Omalonyx unguis (d’Orbigny, 1837) (Gastropoda, Succineidae) in the Misiones Province, Argentina

Guzmán¹,

Serniotti²,

Vogler³

et al. 2018

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Omalonyx unguis (d’Orbigny, 1837) is a semi-slug inhabiting the Paraná river basin. This species belongs to Succineidae, a family comprising a few representatives in South America. In this work, we provide the first record for the species from Misiones Province, Argentina. Previous records available for Omalonyx in Misiones were identified to the genus level. We examined morphological characteristics of the reproductive system and used DNA sequences from cytochrome oxidase subunit I (COI) gene for species-specific identification. These new distributional data contribute to consolidate the knowledge of the molluscan fauna in northeastern Argentina.

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Revalidation of Omalonyx convexus (Heynemann 1868) and emendation of the type locality of Omalonyx unguis (Orbigny 1837): (Mollusca: Gastropoda: Pulmonata: Succineidae)

Cited by 9 publications

References 0 publications

Predicting the distribution of Omalonyx (Mollusca: Pulmonata: Succineidae) species from literature review, museum databases and new sampling efforts in Brazil

Predicting the distribution of Omalonyx (Mollusca: Pulmonata: Succineidae) species from literature review, museum databases and new sampling efforts in Brazil

Integrative taxonomy of the neotropical genus Omalonyx (Elasmognatha: Succineidae)

First record of the semi-slug Omalonyx unguis (d’Orbigny, 1837) (Gastropoda, Succineidae) in the Misiones Province, Argentina

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Revalidation of Omalonyx convexus (Heynemann 1868) and emendation of the type locality of Omalonyx unguis (Orbigny 1837): (Mollusca: Gastropoda: Pulmonata: Succineidae)

Cited by 9 publications

References 0 publications

Predicting the distribution of Omalonyx (Mollusca: Pulmonata: Succineidae) species from literature review, museum databases and new sampling efforts in Brazil

Predicting the distribution of Omalonyx (Mollusca: Pulmonata: Succineidae) species from literature review, museum databases and new sampling efforts in Brazil

Integrative taxonomy of the neotropical genus Omalonyx (Elasmognatha: Succineidae)

First record of the semi-slug Omalonyx unguis (d&rsquo;Orbigny, 1837)&nbsp;(Gastropoda, Succineidae) in the Misiones Province, Argentina

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First record of the semi-slug Omalonyx unguis (d’Orbigny, 1837) (Gastropoda, Succineidae) in the Misiones Province, Argentina