Water mites from stagnant waters of Paraguay

Near to the Paraguayan town Concepción water mites were sampled in one shallow lake and four ponds, so-called Tajamares. These waters are characterized briefly in their abiotic aspects. The six net catches had as a result 29 species out of 13 genera and 5 families. Six species are new to science. Just a single species is found in 7 out of 13 genera. The genus Koenikea is the one with the largest species number, namely 7. Only a few species show greater abundances. Many species have markedly inferior abundances: of 10 species only a single individual could be caught. Not a single species occurred in all five waters

Elenco y biogeografía de los ácaros acuáticos (Acari, Parasitengona, Hydrachnidia) de Sudamérica

Checklist and catalog publications demonstrate a clear connection between basic taxonomy and biodiversity issues. According to some estimates, only 10-30% of all global species have been named. As in other fields, catalogs provide an important source of information concerning species diversity in freshwater ecology. <br /><br /> South America is a continent dominated by freshwater ecosystems. The tremendous habitat diversity created by this landscape supports a high number of arthropods, including water mites, which belong to the hyperdiverse group Acari. South America has a substantial task ahead in cataloging its biodiversity.<br /><br /> Much has been published on water mites in South America. In fact, according to Besch, water mites were the most studied with the exception of Europe up until the 1960’s. Most of the collections were conducted by two acarologists (Lundblad and Karl Viets) during the 1940’s. Today, the collection, identification and description process of water mites is slower. In the 1980’s, the north-american acarologist D. R. Cook produced two lengthy papers about neotropical water mites in four regions of South America. Recently, several Argentine acarologists have published papers on water mites from diverse habitats and regions in South America.<br /><br /> The catalog presented here includes information regarding 6 superfamilies, including 23 families in 118 genera of true water mites (Hydrachnidia, Parasitengona, Acari). It also includes the references concerning the species, distribution in various regions of South America and –as far as known– habitat.<br /><br /> At present, there are 916 species from several authors cataloged in 11 countries in South America. The degree of knowledge varies greatly from country to country, with numerous entries for Brazil and none for French Guiana.<br><br>Las publicaciones de catálogos y listados de especies determinan una clara conexión entre taxonomía básica y temas relacionados con la biodiversidad. Según algunas estimaciones, solo el 10-30% del número total de especies ha sido nominado.<br /><br /> El trabajo que se presenta aquí insumió años de trabajo, en la catalogación de los verdaderos ácaros acuáticos Parasitengona de América del Sur. Se agrega además información sobre la distribución por regiones y hábitats conocidos para las especies.<br /><br /> Hasta el presente hay 6 superfamilias, 23 familias, 118 géneros y 916 especies catalogados en 11 países de América del Sur. El grado de conocimiento varía enormemente de país a país con numerosos datos de Brasil y ninguno de Guayana Francesa

Hidracáridos (Acari, Hydrachnidia) de la cuenca Andina del río Beni, Bolivia Hydracarids (Acari, Hydrachnidia) from the Andean basin of Beni river, Bolivia

<abstract language="eng">Water mites from Andean part of the Bolivian Amazonian rivers were examined. A new species is described, Limnesia aymara. New records and redescription are made for Hygrobatella multiacetabulata Cook,1980, Atractides brasiliensis (Lundblad, 1937) and Krendowskia convexa (Ribaga, 1902). A new subgenus Schwoerbelobatella for hygrobatelids poliacetabulated is proposed and characterized. Ecological characteristics of the river area sampled and ecological preferences of the analyzed species are discussed