The Nymphalidae is a family of about 5,000 species of butterflies which are distributed throughout most of the world. These are usually medium sized to large butterflies. Many species are brightly colored and they include popular species such as the emperor, admirals, tortoiseshells and fritillaries. However, the underwings are dull and in some species look remarkably like dead leaves, or are much paler, producing a cryptic effect that helps the butterfly disappear into its surroundings.
In adult butterflies, the first pair of legs are small or reduced, giving the family the other names of four-footed or brush-footed butterflies. The caterpillars are hairy or spiky with projections on the head, and the chrysalids have shiny spots.
The forewing has the submedial vein (vein 1) unbranched and in one subfamily forked near base; medial vein with three branches, veins 2, 3 and 4; veins 5 and 6 arising from the points of junction of the discocellulars; subcostal vein and its continuation beyond apex of cell, vein 7, with never more than four branches, veins 8-11 ; 8 and 9 always arising from vein 7, 10 and also 11 sometimes from vein 7 but more often free, i.e. given off by the subcostal vein before apex of cell.1
The hindwing has internal (1a) and precostal veins. The cell in both wings closed or open, often closed in the fore, open in the hind wing. Dorsal margin of hind wing channelled to receive the abdomen in many of the forms.1
Antennae always with two grooves on the underside; club variable in shape. Throughout the family the front pair of legs in the male, and with three exceptions (Libythea, Pseudergolis and Calinaga) in the female also, is reduced in size and functionally impotent; in some the atrophy of the fore legs is considerable, e.g. Danainae and Satyrinae In many of the forms of these subfamilies the fore legs are kept pressed against the underside of the thorax, and are in the male often very inconspicuous.1
Systematics and phylogeny
The phylogeny of the Nymphalidae is complex. Several taxa are of unclear position, reflecting the fact that some subfamilies were formerly well-recognized as distinct families due to insufficient study.
Some species migratory. Caterpillars sometimes covered in spines. Host plants include Acanthaceae, Caprifoliaceae, Convolvulaceae, Euphorbiaceae, Fagaceae, Flacourtiaceae, Lamiaceae, Loranthaceae, Moraceae, Plantaginaceae, Poaceae, Rubiaceae, Rutaceae, Salicaceae, Sapindaceae, Scrophulariaceae, Urticaceae and Verbenaceae.3
Wahlberg, Niklas; Weingartner, Elisabet & Nylin, Sören (2003): Towards a better understanding of the higher systematics of Nymphalidae (Lepidoptera: Papilionoidea). Molecular Phylogenetics and Evolution28: 473–484. doi:10.1016/S1055-7903(03)00052-6PDF fulltext