William Marcos da Silva

Occurrence of the freshwater jellyfish Craspedacusta sowerbii (Lankester, 1880) (Hydrozoa, Limnomedusae) in a calcareous lake in Mato Grosso do Sul, Brazil

The occurrence of the freshwater jellyfish Craspedacusta sowerbii (=sowerbyi) Lankester, 1880 was recorded in April 2006 in the Lagoa Misteriosa water body, a calcareous lake (doline) in Mato Grosso do Sul State, Brazil. Only Rotifera composed the zooplankton community was composed only of Rotifera and the environment was meso-eutrophic system. The nomenclature of C. sowerbii is discussed with regard to the use of the correct spelling and an alternative one. The distributions of C. sowerbii in Brazil include eight states and in South America the distribution includes four countries.

First Record of the Peritrich Trichodina diaptomi (Protozoa: Ciliophora) on a South American Calanoid Notodiaptomus deitersi (Poppe, 1890) (Crustacea: Copepoda)Basson and Van As, 1991

ABSTRACT. The ciliate Trichodina was recorded on the calanoid Notodiaptomus deitersi in a shallow, eutrophic reservoir, located in the centre‐west of Brazil. The species was confirmed as Trichodina diaptomi, a species widely distributed in Europe, Africa, Asia and Australia. It was observed moving freely over the carapace of the copepod, and using its adhesive disc. This is the first record for the species in the Americas.

First Record of the Peritrich Trichodina diaptomi Basson and Van As, 1991 (Protozoa: Ciliophora) on a South American Calanoid Notodiaptomus deitersi (Poppe, 1890) (Crustacea: Copepoda)

ABSTRACT. The ciliate Trichodina was recorded on the calanoid Notodiaptomus deitersi in a shallow, eutrophic reservoir, located in the centre‐west of Brazil. The species was confirmed as Trichodina diaptomi, a species widely distributed in Europe, Africa, Asia and Australia. It was observed moving freely over the carapace of the copepod, and using its adhesive disc. This is the first record for the species in the Americas.

DNA extraction and ITS2 (internal transcribed spacer 2) gene sequences of some Brazilian freshwater copepods

Copepods, one o f the most important plankton components in freshwater, are identified by small appendices and other morphological structures. But taxonomy based only on morphological structures results in imprecision and incorrectly identified organisms, which affects ecological studies such as biogeography, evolution, competition, and environmental bioindicators. tribute to understanding the ecological behavior of copepods. Some isolated efforts using molecular biology on freshwater copepods using molecular biology have been made by WYNGAARD et al. (1995), GRISHANIN et al. (1996) and THUM (2004), but as yet no coordinated effort has been made to identify markers and create a gene bank for these organisms. A gene bank would allow comparison o f species from different continents, different subspecies, and species from impacted and non-impacted environments. Gene banks can also be powerful tools in evolutionary studies, as demonstrated by GIRIBET et al. (2001) and New skills to increase accuracy in identification are required. Molecular biology can certainly con-

Checklist dos Copepoda Cyclopoida de vida livre de água doce do Estado de São Paulo, Brasil

The biodiversity of Cyclopoida copepods of Sao Paulo State was studied during the Program BIOTA/ FAPESP. Samples were collected from 207 water bodies of the 22 Units of Management of Water Resources (UGRHI). From the 39 registered species, 6 were new records from Sao Paulo State. The new species Thermocyclops iguapensis is a species restricted to the Atlantic coast (Silva & Matsumura-Tundisi 2005a). For some species corrections of identification were made: species identified as Mesocyclops kieferi, Mesocyclops brasilianus, and Paracyclops fimbriatus are in reality respectively Mesocyclops ogunnus, Mesocyclops meridianus and Paracyclops chiltoni. These corrections are important since their populations can be indicators of the trophic conditions as verified by Silva & Matsumura-Tundisi (2002) for the reservoirs of the lower and middle Tiete

Diurnal variation in planktonic crustacean population densities in a marginal lake of the Brazilian Pantanal

Studies on the zooplankton of marginal lakes in Brazíl, especially in the centre-west region that includes the Pantanal wetland, consist primarily of taxonomic inventories; ecological estimates of abundance have generally considered each system as a whole (NEvEs et al. 2003 and references therein). Information on horizontal and vertical distributions of zooplankton, including diurnal and seasonal changes, and their potential food items (phytoplankton) and potential predators (invertebrates, fish) within any particular lake is lacking. Such information is important when considering interactions between species (PERTICARRARI et ai. 2004, PELICICE et ai. 2005, lGLESIAS et al. 2007). W e analyzed the vertical distribution of the crustacean zooplankton during a 12-hour period in the open water of a shallow marginallake in the Pantanal wetland.