Abstract
AbstractThere is a debate about the systematic status of Leptobathynellidae Noodt, 1965. Are they a highly specialized offshoot of Parabathynellidae or do they deserve separate familial status? The arguments for the latter point of view are critically evaluated and as a result it is suggested to merge Leptobathynellidae with Parabathynellidae as had already been done earlier. Separate familial status for Leptobathynellidae would leave Parabathynellidae as a paraphyletic rest. The probably most plesiomorphic species within Bathynellidae is Baicalobathynella magna (Bazikalova, 1954), which belongs to the first Bathynellacea ever described. Its redescription presented here adds important new details. The morphological differences between Bathynellidae and Parabathynellidae are listed. There is some confusion about the year of publication of their names. The correct citations are: Bathynellidae Grobben, 1905 and Parabathynellidae Noodt, 1965.
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