Some rotifers from coastal lakes of Brazil, with description of a new rotifer, Lepadella (Xenolepadella) curvicaudata n. sp.

Abstract

Four relatively rare, two common rotifers and one rotifer new to science are described from some coastal lakes near Rio de Janeiro, Brazil . Each rotifer is described in detail, and several are accompanied by illustrations and mensuration data . Geographic distribution and individual habitats of the rotifers are also discussed . Several species show a larger geographic distribution than previously known .

Seasonal variation, distribution and interrelationships of rotifers in Opa Reservoir, Nigeria

“…This species was restricted to the riverine station which had the highest conductivity and alkalinity in the reservoir water. Some correlation between conductivity and zooplankton numbers was also found in vegetation flanking the main channel of the Zambesi River (Welcomme, 1985), while Turner (1990b) suggested that warm water hardness and alkalinity were primary preferred environmental conditions for certain Lecane species. It seems likely that conductivity and alkalinity are very important contributing environmental factors in the seasonal cycle, distribution and abundance of Lecane curvicornis in Opa Reservoir.…”