It is monotypic containing the species Zeltus amasa, the fluffy tit,[1][2] a small butterfly found in Indomalayan realm.

[6] Zeltus amasa has false eyes, legs, and antennae on the hindwing, which resembles and diverts attention from its real head.

Forewing, pale rufous-brown, four-fifths of the hinder marginal area from the base below vein 2 bluish-white, markings slightly darker than the ground colour; a bar at the end of the cell, edged on both sides with white, a slightly outwardly curved, even discal narrow band of the same width as the cell bar, edged on both sides with white, extending from near the costa to below vein 2, an indistinct similar sub-marginal band without the white edgings.

Hiudwing with the upper portion of a paler rufous-brown, paling hindwards, and becoming pale bluish-grey on the lower two-thirds of the wing; a black sub-basal spot below the costa, a pale bar at the end of the cell, edged on both sides with white, a discal broken band of the same narrow width as on the forewing, edged on both sides with white, in a straight line from the costa to vein 4, a linear mark in the next lower interspace well inwards, and below it a line twice acutely angled, then bending inwards straight on to the abdominal margin above the anal angle, a sub-marginal double series of somewhat lunular marks, the outer series ending in a large black spot in the first interspace just above the upper tail, and another at the anal angle; a terminal fine black line with an inner white line.

Hindwing with the costa narrowly pale, the rest of the wing brown, paling hindwards and becoming white towards the anal angle, a large black sub-terminal spot above the upper tail, a small one at the anal angle, a suffused brownish spot or mark between them, a short double series of brownish lunular marks on the white ground above them.

The male Zeltus rarely visits flowers, and stays on wet or damp patches, or on the leaves which are about 10 feet (3.0 m) above the ground.