Abstract
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.
Highlights
Omalonyx (d’Orbigny, 1837) is a genus of the family Succineidae, which includes semi-slugs that live generally in backwater areas, on floating macrophytes and on riparian vegetation (Arruda and Thomé 2011, Garcia et al 2012)
We examined morphological characteristics of the reproductive system and used DNA sequences from cytochrome oxidase subunit I (COI) gene for species-specific identification
Individuals were captured during the sunset while they were involved in full activity on the leaves and flowers of Eichornia crassipes (Pontederiaceae) and on riparian vegetation (Figs 1–4)
Summary
Omalonyx (d’Orbigny, 1837) is a genus of the family Succineidae, which includes semi-slugs that live generally in backwater areas, on floating macrophytes and on riparian vegetation (Arruda and Thomé 2011, Garcia et al 2012). This genus has a reduced fingernail-shaped shell with specimens usually exhibiting a light to mediumbrown coloration, dark scattered spots, and 2 dark dorsal longitudinal bands (Arruda et al 2006, Cuezzo 2009). Omalonyx spp. act as intermediate hosts of nematodes and trematodes, with recorded cases in Brazil of specimens of Omalonyx sp. infected with bird flukes of the genus Leucochloridium
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