| Common joker | 
|  | 
|  | 
|
| Scientific classification | 
| Domain: | Eukaryota | 
 
| Kingdom: | Animalia | 
 
| Phylum: | Arthropoda | 
 
| Class: | Insecta | 
 
| Order: | Lepidoptera | 
 
| Family: | Nymphalidae | 
 
| Genus: | Byblia | 
| Species: | B. anvatara | 
| Binomial name | 
| Byblia anvatara 
 | 
|
| Synonyms | 
| Hypanis vulgaris Staudinger, 1886Byblia anvatara anvatara f. seriata Rothschild and Jordan, 1903Hypanis acheloia Wallengren, 1857Hypanis castanea Butler, 1886Hypanis ilithyia var. vulgaris Staudinger, 1886Byblia acheloia vulgaris ab. albitrimacula Strand, 1911Byblia acheloia ab. holobrunnea Vári, 1976Byblia acheloia acheloia f. similata van Son, 1979Byblia boydi Dixey, 1898Byblia ilithyia var. crameri Aurivillius, 1894Byblia anvatara crameri f. fasciata Rothschild and Jordan, 1903Byblia acheloia ab. infuscata Schultze, 1920Byblia acheloia crameri f. nigrifusa Joicey and Talbot, 1921Byblia acheloia f. greenawayi Stoneham, 1965
 | 
Byblia anvatara, the common joker, is a butterfly of the family Nymphalidae, found in Sub-Saharan Africa.
Wingspan: 38–43 mm in males and 40–45 mm in females. Its flight period is year round.
Larvae feed on Tragia glabrata and Dalechampia capensis.