Megadytes

Megadytes is a genus of diving beetles in the family Dytiscidae. They are found in slow-moving or static freshwater habitats throughout most of the Neotropics, ranging from Florida and Mexico, through the West Indies and Central America, to South America as far south as central Argentina. The adult beetles measure about 1.65-4.75 cm long depending on the exact species and the largest is also the largest in the family (together with certain Dytiscus).

Species
Megadytes contains the following 21 species in 4 subgenera:

Subgenus Bifurcitus: Subgenus Megadytes: Subgenus Paramegadytes: Subgenus Trifurcitus: The subgenus and status of these two species are unknown:
 * †Megadytes ducalis Sharp, 1882
 * Megadytes lherminieri (Guérin-Méneville, 1829)
 * Megadytes magnus Trémouilles & Bachmann, 1980
 * Megadytes carcharias Griffini, 1895
 * Megadytes ecuadorius Zimmermann, 1919
 * Megadytes flohri Sharp, 1882
 * Megadytes fraternus Sharp, 1882
 * Megadytes guayanensis (Wilke, 1920)
 * Megadytes guignoti Mouchamps, 1957
 * Megadytes laevigatus (Olivier, 1795)
 * Megadytes latus (Fabricius, 1801)
 * Megadytes marginithorax (Perty, 1830)
 * Megadytes steinheili (Wehncke, 1876)
 * Megadytes australis (Germain, 1854)
 * Megadytes glaucus (Brullé, 1837)
 * Megadytes aubei (Wilke, 1920)
 * Megadytes aubei meridionalis Mouchamps, 1957
 * Megadytes fallax (Aubé, 1838)
 * Megadytes gravidus Sharp, 1882
 * Megadytes obesus Sharp, 1882
 * Megadytes perplexus Sharp, 1882
 * Megadytes robustus (Aubé, 1838)
 * Megadytes costalis (Fabricius, 1775)
 * Megadytes obovatus (Kirby, 1826)