On two Antarctic species of Oswaldella Stechow, 1919: O. shetlandica Stepan'yants, 1979 and O. elongata spec. nov. (Cnidaria Hydrozoa) (Notes on Antarctic hydroids, II)

Two species of the antarctic hydroid genus Oswaldella Stechow, 1919, are considered. The first, described by Stepan'yants (1979) as a subspecies, O. billardi shetlandica, has been raised to specific level and will henceforth be indicated as Oswaldella shetlandica Stepan'yants, 1979. A second species is described as Oswaldella elongata spec. nov. Both species are differentiated against the remaining known species of Oswaldella; new records are added and the geographical distribution is discussed. Resumen: Se considera la posición sistemática de dos especies del género Oswaldella Stechow, 1919. Una de ellas, descrita por Stepan'yants (1979) como una subespecie de Oswaldella billardi Briggs, 1938, es elevada al nivel específico y pasa a denominarse Oswaldella shetlandica Stepan'yants, 1979. La segunda especie se describe como Oswaldella elongata spec. nov. Se remarcan las diferencias de estas dos especies con las restantes especies del género y se presentan los datos existentes sobre la autoecología de ambas especies.