Coranarta cordigera, the small dark yellow underwing, is a moth of the family Noctuidae.

Forewing blackish, dusted with pale grey scales especially in basal and marginal areas, the median being darker, or even black; inner and outer lines deep black; reniform stigma large and white with a grey lunule in it ; orbicular small, grey and obscure; hindwing yellow with a broad black marginal border, the costal margin grey; ab.

variegata Tutt is a rare form, in which the dark median area is traversed by a grey band between the stigmata, the space between outer and submarginal line filled in with black to form a fascia, and another following the basal line; — in suffusa Tutt the whole wing is black except the pale marginal area and the white reniform; — aethiops Hofm.

has the entire wing black except the stigma; — while carbonaria Christ, from Siberia resembles aethiops above, but the underside of forewing is yellow with the marginal areas dark.

— Larva purplish-red : dorsal line pale yellow, with dark oblique streaks beyond segment 4, meeting on the dorsum; subdorsal lines obscurely paler; spiracular line yellow with a black upper edge; spiracles yellow, each accompanied by a yellow blotch; sometimes the larva is wholly blackish, with the markings all obscured.