The study of 38 samples of aquatic fauna from Venezuela increased the number of known species here from 28 to 66 . Fifteen new species for science are described . A list of Copepoda known from the other regions of South America is presented . From this list, it can be said that only 50% of the inland water Copepoda living actually in Venezuela are known.
Sixteen species of Copepoda were recorded in this first detailed study of Costa Rican zooplankton. Two of these species are halophile. Notes are given on some of the species and their distribution. One new species found will be described elsewhere. The Costa Rican fauna resembles in composition the fauna of other Central American and Caribbean regions. Relatively few species were recorded. This is partly due to a low intensity of sampling but also to the paucity of lentic habitats. The occurrence of two circumtropical species of Mesocyclops is interesting.16 esptces de Coptpodes ont Ctt inventorites au cours d'une premiere etude dttaillke du zooplankton dulcaquicole de Costa Rica. Deux des espbces trouvtes sont halophiles. Des remarques sont faites a propos de quelques esptces et de leur rkpartition. Une nouvelle esptce est nouvelle -elle sera dtcrite par ailleurs.La faune de Costa Rica resemble par sa composition a celle des autres pays d'Amkrique centrale et des iles caraibes. Relativement peu d'esptces sont nottes. La faible intensitk de l'tchantillonnage mais aussi la pauvretk en habitats limniques en sont responsables. La presence de deux esptces circumtropicales de Mesocyclops est intkressante.
Studies on tropical freshwater zooplankton which commenced in the mid-19th century have been intensified during the past twenty years or so . The whole region, barring a few areas, has been investigated, including very recently tropical Australia . The widely scattered literature is briefly summarized with comments . Some general distributional patterns are emerging . There is a dearth of ecological studies especially on seasonality and production . Systematics lags behind the North Temperate zone in most tropical regions .
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