Chlosyne janais

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Crimson patch
Crimson Patch (Chlosyne janais) (9366229301).jpg
Crimson patch caterpillar (Chlosyne janais).jpg
imago and caterpillar
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Nymphalidae
Genus: Chlosyne
Species:
C. janais
Binomial name
Chlosyne janais
Drury, 1782

Chlosyne janais, the crimson patch or janais patch, is a common New World butterfly found from Colombia north through Central America and Mexico to southern Texas, with occasional sightings in southeastern Mexico and northern Texas. The dorsal and ventral wing surface is black with several undulating rows of small white spots on the medial forewings and along all outer wing margins. On each dorsal hindwing is a medial orange-red patch situated anteriorly. The ventral hindwings have a fragmented yellow proximal patch bordered by a thick postmedial band of red that does not reach the wing margins; maximum wingspan is 4.86.7 cm.

Imago at Campeche, Mexico Crimson Patch 6.2018861w.wiki.jpg
Imago at Campeche, Mexico
Wing undersides, Costa Rica Crimson Patch (Chlosyne janais) (52361392367).jpg
Wing undersides, Costa Rica

Adults inhabit the periphery of lowland tropical to subtropical forests, fields, and along streams, where they feed on flower nectar. Reproduction is continuous in the tropics, whereas in temperate areas several broods are produced from July to November. The caterpillars are grey white to green with several transverse rows of fleshly black spines; they feed primarily on acanthus shrubs, especially Anisacanthus wrightii and Odontonema callistachus (in Texas), upon which adult females lay their eggs.

The crimson patch can reach high numbers in the Rio Grande Valley, but the population is periodically killed off by cold snaps; the area is then recolonized by members of the Mexican population. A very similar species is the rosita patch (C. rosita), which is distinguished from the crimson patch by the former's lack of spots on the wing margins.

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