Argyroneta aquatica (Clerck 1757) should be included in Cybaeidae Simon 1898. There is no justification for a monotypic family Argyronetidae; differences from other cybaeids are either specializations for aquatic life or derived with respect to other cybaeids. The features of a recently described Eocene spider, Vectaraneus yulei Selden 2001 are discussed, which place it together with Argyroneta in subfamily Argyronetinae Thorell 1870 of Cybaeidae. Fossil spiders intermediate between Vectaraneus and Argyroneta are reviewed.
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