ZooKeys 476: The New World Whirligig Beetles of the Genus Dineutus Macleay, 1825 (Coleoptera, Gyrinidae, Gyrininae, Dineutini)

About this book

For the first time, all the New World members of the whirligig beetle genus Dineutus Macleay, 1825 are treated in a single published work. This monograph treats all 18 species and 6 subspecies of the genus found in the New World, providing dorsal and ventral habitus images of both sexes, illustrations of the male genitalia from three different views, and introduces a new external species-specific character – the male mesotarsal claws. Identification keys are provided for the genera of whirligig beetles, and for all species and subspecies of the genus Dineutus, within the New World. General distribution maps are also included in the work as are lectotype designations for several species. The primary goal of this monograph is to allow for the accurate identification of any member of Dineutus within the New World.

Contents

Introduction   3
Material and methods   5
On the homology of the gyrinid anatomy and terminology   7
Structures of taxonomic importance   8
Taxonomy   13
Key to the adults of the genera of Gyrinidae within the New World   13
Key to the adults of the New World species of Dineutus   13
   Dineutus amazonicus Hatch, 1930   22
   Dineutus americanus (Linnaeus, 1767)   23
   Dineutus angustus LeConte, 1878   27
   Dineutus assimilis (Kirby, 1837)   31
   Dineutus carolinus LeConte, 1868   37
   Dineutus ciliatus (Forsberg, 1821)   45
   Dineutus discolor Aubé, 1838   49
   Dineutus emarginatus (Say, 1825)   53
   Dineutus hornii Roberts, 1895   58
   Dineutus longimanus (Olivier, 1791)   62
   Dineutus longimanus cubensis Ochs, 1927   63
   Dineutus longimanus jamaicensis Ochs, 1938   66
   Dineutus longimanus longimanus (Olivier, 1795)   69
   Dineutus longimanus portoricensis Ochs, 1924   72
   Dineutus mexicanus Ochs, 1925, stat. n.   76
   Dineutus nigrior Roberts, 1895   80
   Dineutus productus Roberts, 1895   84
   Dineutus robertsi Leng, 1911   89
   Dineutus serrulatus LeConte, 1868   92
   Dineutus serrulatus analis Régimbart, 1883   94
   Dineutus serrulatus serrulatus LeConte, 1868   99
   Dineutus solitarius Aubé, 1838   103
   Dineutus sublineatus (Chevrolat, 1834)   108
   Dineutus truncatus Sharp, 1873   116
Specimens of uncertain placement   120
Dineutus sp. near mexicanus   120
Checklist of the New World species of Dineutus   126
Acknowledgements   127
References   128

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