Four species are recognized within the Agabus (Gaurodytes) brunneus group, A. brunneus (Fabricius), A. didymus (Olivier), A rufulus Fairmaire and A. ramblae new species, from the eastern Iberian peninsula and the Balearic Islands. Agabus brunneus, A. rufulus and A. ramblae form a complex of closely related species distinguished mainly by aedeagal characters. A key of the species of the A. brunneus groups is provided, as well as some information about the known distribution, habitat and ecology of A. ramblae.
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Millán et al. (2001) studied this question.