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The classification of the Neotropical   Cybistrinae   Sharp, 1880 (  Coleoptera  :   Adephaga  :   Dytiscidae  ) is extensively revised based on a phylogenetic analysis of morphological features of the group. A new genus,    Nilssondytes    gen. nov.  is described for a unique new species,    Nilssondytes   diversus    sp. nov.  from Venezuela. The New World genus,    Megadytes    Sharp, 1882, with several subgenera, was found to not be monophyletic. The type species of    Megadytes   ,    Dytiscus   latus    Fabricius, 1801 and the species    Cybister   parvus    Trémouilles, 1984 were found to be monophyletic together, and phylogenetically more closely related to    Cybister    Curtis, 1827 than to other speciesassigned   to    Megadytes    sensu stricto, which were found to also be monophyletic. The name    Megadytes    is here restricted to include only    Megadytes   latus    and    Megadytes   parvus   . These two speciesassigned   to this newly restricted genus concept are reviewed and diagnosed. A new genus,    Metaxydytes    gen. nov. , is erected to include all the other species currentlyassigned   to   Megadytes   sensu stricto. The current subgenus names assigned toMegadytes  ,Bifurcitus    Brinck, 1945,Paramegadytes    Trémouilles &amp; Bachmann, 1980, andTrifurcitus    Brinck, 1945, are elevated to genus rank since they are variously paraphyletic. The two speciesassigned   to   Cybister  ( Neocybister )  Miller, Bergsten &amp; Whiting, 2007,   Cybister  ( Neocybister )  festae   Griffini, 1895, and   Cybister  ( Neocybister )  puncticollis   (Brullé, 1837) re reviewed and diagnosed with the former redescribed and its type specimens considered for the first time since its description. Another evidently new species and possible new genus,    Megadytes    species, IR57 ( Ribera et al. 2008 ), from Peru, is also characterized, but not formally treated because of lack of important data for the single, partial specimen. Diagnostic features are illustrated for the entire group.

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﻿Reclassification of   Cybistrinae   Sharp, 1880 in the Neotropical Region (  Coleoptera  ,   Adephaga  ,   Dytiscidae  ), with description of new taxa

﻿Reclassification of Cybistrinae Sharp, 1880 in the Neotropical Region ( Coleoptera , Adephaga , Dytiscidae ), with description of new taxa

Reclassification of Cybistrinae Sharp, 1880 in the Neotropical Region ( Coleoptera , Adephaga , Dytiscidae ), with description of new taxa