Tag Archives: inventory

El Salvador non-marine molluscs

Ignacio Agudo-Padrón has just published a short paper with a list of land and freshwater species from El Salvador. Although most data are contained in the overview by Thompson (2011), two species are listed now as a new for the territory: Bulimulus corneus (G.B. Sowerby I, 1833) and Orthalicus maclurae Martens, 1893.

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The paper is illustrated with several photographs of live snails (Drymaeus discrepans (G.B. Sowerby I, 1833) above) and the species list contains 30 names, based on an inventory made by the government of El Salvador in 2016.

Reference:
Agudo-Padrón, I., 2019. Los moluscos no marinos ocurrentes en El Salvador, América Central: una breve revisión panorámica introductoria de su actual conocimiento. – Bioma (El Salvador), 5: 48–53.
Thompson, F.G., 2011. An annotated checklist and bibliography of the land and freshwater snails of México and Central América. – Bulletin Florida Museum Natural History, 50(1): 1–303.

Peruvian inventory in Amazonia

An interesting paper appeared recently, although only as ‘advance online’ and not yet in the final paginated version. It concerns an inventory of a protected are in Peruvian Amazonia.
The abstract reads “We investigated the land snail fauna of the Panguana conservation area on the western rim of the Amazonas basin in Peru. A total of 2,322 individuals assigned to 65 land snail species were collected in 32 plots. Ten additional species were found in collections made on previous expeditions to Panguana. On the basis of avail- able data, Panguana is the most species rich locality for land snails in South America. The species density of 75 land snail species in c. 2 km2 of rather homogeneous rainforest is also high on a global scale. The land snail fauna of Panguana is characterized by a very high proportion of species belonging to the carnivorous family Scolodontidae, many of which are likely to be new to science. The fauna includes seven species that are new records for Peru, and the species Hirtudiscus sp., Xenodiscula venezuelensis, Geostilbia aperta, Guppya gundlachii and Thysanophora plagioptycha represent genera not previously recorded from the country. The synanthropic species Allopeas gracile, Opeas hannense, Subulina octona, Geostilbia aperta and Gastrocopta servilis form an ecologically distinct group that occurs mainly in sites strongly modified by humans. The presence of these species on the margin of the Amazon rainforest is evidence of the ongoing homogenization of the global fauna”.

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Both the absolute number and the composition of the fauna is quite outstanding. It also shows that a thorough search by competent malacologists still can bring many new novelties for the Neotropics to the surface. Both as new records for a country and supposedly new species to science.

Reference:
Wendebourg, B. & Hausdorf, B., 2019. The land snail fauna of a South American rainforest biodiversity hotspot: the Panguana conservation area in the Peruvian Amazon. – Journal of Molluscan Studies: 8 pp. doi:10.1093/mollus/eyz014

Land snails from Guadeloupe

Laurent Charles published the preliminary results of his field work on the island of Guadeloupe, Lesser Antilles recently. The text is in French, with a brief summary in English as follows “Guadeloupe malacofauna has been subject to very few studies. After a short reminder of the 19th and 20th centuries studies, I present the first results of the field work undertaken in 2014 and 2015, that lead to recognize at least 73 taxa in the archipelago. I present the main facts on the specific diversity encountered in Guadeloupe and assess endemic, rediscovered and recently introduced species”.

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In the paper is a list of species endemic to Guadeloupe (espèces endémique) or to the Lesser Antilles (espèces endémiques regionales).

Reference:
Charles, L., 2016. Inventaire des mollusques terrestres de Guadeloupe, Petites Antilles: données préliminaires. – MalaCo, 12:47–56. Link

Nicaraguan biodiversity

López et al. (2015) have added a paper on the poorly known malacolofauna of Nicaragua, in which they report on a study of land and freshwater snails in a nature reserve in southern Nicaragua. This lake and the surrounding area lies in a volcanic district, and their inventory totalled up to more than 14,000 specimens belonging to 77 species. They found five species that might be new to science, but didn’t describe these.

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The paper includes two tables, one with the collected samples per family, the second with the species listed alphabetically.

Reference:
López, A., Urcuyo, J. & Vega, G., 2015. Biodiversidad de la fauna malacológica en la laguna de Apoyo, Nicaragua. – Revista Encuentro, 102: 8-18.

Gastropods from Misiones, Argentina

Faunal inventories are the first step for any biodiversity research, and although Argentina recently had a partial update (see Cuezzo et al. 2013), the contribution of Gutiérrez et al. published at the same time is welcomed as well. It focusses on the northeastern part of the country, the Prov. Misiones.

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The abstract reads as follows: “The Atlantic Forest represents one of the global priority eco-regions for biodiversity conservation. In Argentina, this is represented by the Paranense Forest, which occupies much of the Misiones Province. In this paper, an updated list of land mollusks from Misiones Province is presented, and its species richness was evaluated comparing protected and unprotected areas. For this, we reviewed La Plata Museum Mollusk Collection, updated the literature review, and developed some field work between 2009 and 2010. For the areographic work, a grid (50x50km) was applied to a Misiones province map. In this region, large areas of native vegetation constituting the Paranaense Forest still persist, and include protected areas such as the Iguazu National Park and Puerto Peninsula Provincial Park. These areas have been the most explored at the malacological level (both terrestrial and aquatic environments), a fact that is consistent with the greater number of records found, which may also be the explanation for the highest number of species recorded in the region. A database containing 497 records was compiled. The number of species occurring in this Province was increased from 28 to 56; 11 of which were exotic species. A total of 38 of the species occurred in protected areas and 53 in unprotected areas; and 25 species were micro-mollusks. Orthalicidae was the family with the highest species number (10) and the widest distribution, occupying 16/20 sampling units. Megalobulimus was the genus found in a greater number of sampling units (14/20). The highest values of specific richness of land gastropods were found in Northern Misiones (R=32). This richness was similar to that previously reported for the Tucuman Province, although species occurring in both provinces were mostly different. The richness in Misiones Province border areas, as the Republic of Paraguay and the state of Santa Catarina (Brazil), was about twice that found in the province. The present study showed the existence of poorly explored areas at malacological level, especially in Central and Eastern Misiones. Data presented here will allow focus future sampling efforts on such areas, so patterns of species distribution can be better defined.” The main body of the article is in Spanish.

Reference:
Gutiérrez, D.E., Núñez, V., Vogler, R.E., Beltramino, A.A. & Rumi, A. Gasterópodos de la provincia Misiones, Argentina. – Revista de Biología  Tropical 61 (4): 1759-1768.