Copelatus cf. tenebrosus

Family: Dytiscidae
Subfamily: Copelatinae
Tribe: Copelatini

Habitat: Wetland

General appearance: Body outline fairly continuous; hind claws are of equal length; pronotum narrowly but clearly bordered laterally; Six conspicious elytra striae; all elytra striae ends near prosternal side; hind coxal lines well impressed and nearly touching median line, turning outward at a near-right angle into hind coxal process. Differ from Copelatus oblitus by that two of the elytra striae on each sides close to the sides and one close to the middle do not end close to the base of elytra.

 

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.