Hypolimnas misippus, the Danaid eggfly,[2][3] mimic,[3] or diadem, is a widespread species of nymphalid butterfly.

Males are in a singular form, appearing blackish with distinctive white spots that are fringed in blue.

A broad, oval, white discal patch extends from costa to the middle of interspace 2, edged with a diffused dusky black border.

A very broad medio-discal white band stretches from the costa to the dorsum, intersected at the apex of interspace 1 a by a transverse black mark.

[15] This absence contributes to presence of intermediate forms, due to lack of model species causing variability in mimicry.

The inner margin of this black area follows a line crossing the cell obliquely and curving round to near apex of interspace 1a.

[13] Hindwing: It is characterized by a transverse round spot located in interspace 7, with the terminal margin is notably broadly black.

The underside presents a paler tawny-yellow hue, contrasting with deeper tawny coloration of the disc on the forewing.

Specifically, the oblique series of elongate spots appears yellowish, and the central portion of the black apical region consists of a tawny hue.

The head is equipped with two long, thick branched black spines thats serve as defensive adaptations.

[13] Food plant: The larvae primarily feed on the leaves of Portulaca oleracea (common purslane, also known as little hogweed, or pursley), and Asystasia lawiana.

It is variegated and streaked with bistre, particularly around the head and tail regions, providing further adaptations to the environment.

The vibrant colours of the Plain Tiger advertise its unpalatable nature to predators around, so the Danaid female sends out the same signal, regardless of it not being toxic.