Rhantus sp.
Family: Dytiscidae
Subfamily: Colymbetinae
Tribe: Colymbetini
Habitat: Wetland
General appearance: Dense black speckles on yellow elytra. Prosternal process convex to carinate.
Reference:
Pederzani, F. (1995). Keys to the identification of the genera and subgenera of adult Dytiscidae (sensu lato) of the world (Coleoptera Dytiscidae). Atti dell'Accademia Roveretana degli Agiati, a, 244, 5-83.