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All New World members of the whirligig beetle genus    Dineutus    Macleay, 1825 are treated. The New World    Dineutus    are found to be composed of 18 species and 6 subspecies: one species,    Dineutus   mexicanus    Ochs, 1925,  stat. n.  is elevated from subspecies to species rank, and the subspecies    D.   carolinus   mutchleri    Ochs, 1925,  syn. n.  is synonymized here with the typical form. Lectotypes are designated for    D.   discolor    Aubé, 1838,    D.   metallicus    Aubé, 1838,    D.   solitarius    Aubé, 1838,    D.   analis    Régimbart, 1883, and    Gyrinus   longimanus    Olivier, 1795. Each taxonomic unit is provided with a taxonomic history, type locality, diagnosis, distribution, habitat information, and a discussion section. The aedeagus and male mesotarsal claws are illustrated, and dorsal and ventral habitus images of both sexes, for each species and subspecies are provided. General distribution maps are provided for all taxonimc units. A key to the genera of New World   Gyrinidae  , as well as all the New World    Dineutus    species is provided. General    Dineutus    anatomy as well as a clarification of homology and anatomical terms is included.

The New World whirligig beetles of the genus Dineutus Macleay, 1825 ( Coleoptera , Gyrinidae , Gyrininae , Dineutini )