A new species of Notodiaptomus Kiefer ( Crustacea , Copepoda , Calanoida , Diaptomidae ) from Brazil

Description of a new species of Diaptomidae (Crustacea, Copepoda, Calanoida) Notodiaptomus oliveirai is given from the material obtained at a reservoir at Barra Bonita, SP in 1992. The new species is very similar to Notodiaptomus henseni Dahl 1894 although both species can be found in the same locality, constituting two distinct populations. Notodiaptomus oliveirai seems to be endowed with great adaptability to changes in environmental conditions, extending its distribution to all the hydrographic basins in the state of São Paulo.


Introduction
This material was collected during the expeditions carried out from 1992 to 1996 in the Project: "Comparative studies between Barra Bonita and Jurumirim reservoirs inserted respectively in the Tietê River and Paranapanema River basins on biogeophysical processes basis" coordinated by J.G. Tundisi and financed by FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo) (Tundisi, 1994).
The drawings of the main pieces that characterise the species were made up by Espindola (1994) from Barra Bonita reservoir specimens, by camera lucida, and the pictures were taken from images captured in the microscope based on the specimens occurring in the same reservoir, but from samplings carried out in 2000 (BIOTA-FAPESP, 2003).
The type specimens are deposited in the collection of DCBU (Departamento de Ecologia e Biologia Evolutiva at the Universidade Federal de São Carlos, São Paulo, Brazil).
Holotype, ♂, body size: 1.15 mm; general aspect of male as in Figure 1; right antenna of male as in Figure 3a, 3b; 5 th leg of male presents the terminal claw relatively short almost the same length as the second segment of exopodite and the proximal margin of second segment of exopodite is half the distal margin with a strong concavity in the inner margin (Figure 5a, 5b).
Paratypes, ♀, 1.29 mm of length; general aspect of female as in Figure 4a, 4b; right 5 th leg of female as in Figure 5a, 5b where it can be seen that the endopodite corresponds to half the size of the first exopodite.
Notodiaptomus oliveirai spec.nov. is probably a species adapted to the eutrophic conditions of reservoirs as have been observed in Barra Bonita reservoir.It was registered in this locality in 1992, July, at first in small number, but in 1993, became more abundant and in 2002, it was the most abundant species, outnumbering Notodiaptomus iheringi dominant in the Calanoida population of Barra Bonita reservoir (Tundisi et al., 2008).
In recent studies carried out in 350 water bodies (reservoirs, lakes and ponds) in São Paulo state (BIOTA/ FAPESP, 2003), Notodiaptomus oliveirai spec.nov.was species present a knob at the proximal inner corner of basipodite II, but the shape of the second segment of exopodite is different, without inner margin concavity present in this new species (see figures in Kiefer, 1936).

Geographical Distribution of
Recursos Hídricos, in São Paulo state) showing that the species was present in most of the watersheds of São Paulo state, except the Alto Tietê river, Mantiqueira, Mogi Guaçu river, Pardo river and Paraná river basin (UGRHI São José dos Dourados).
The new species seems to have a great plasticity in relation to environmental conditions, and it has wide distribution, probably due to the ability of rapid dispersion mechanisms.It is found in great number in the main watersheds of São Paulo State after the first record that occurred in 1992, in the Barra Bonita Reservoir.
Notodiaptumus oliveirai spec.nov. in São Paulo State, Brazil, and its Ecology (Figure6)The new species was recorded for the first time inBarra Bonita Reservoir, São Paulo State, Brazil, in 1992,