Belongs within: Thraupidae.
Dacnis is a genus of tanagers with thin, sharp-pointed bills; males are blue whereas females are greenish (Hilty 2011).
Dacnis Cuvier 1816H11
|--D. albiventris (Sclater 1852) [=Pipraeidea albiventris, Hemidacnis albiventris]H11
|--D. analisSS66
|--D. berlepschi Hartert 1900H11
|--D. cayana (Linnaeus 1766)H11 (see below for synonymy)
| |--D. c. cayanaH11
| |--D. c. baudoana Meyer de Schauensee 1946H11
| |--D. c. callaina Bangs 1905H11
| |--D. c. coerebicolor Sclater 1851H11
| |--D. c. glaucogularis Berlepsch & Stolzmann 1896H11
| |--D. c. nepaea Bangs 1898H11
| |--D. c. paraguayensis Chubb 1910H11
| `--D. c. ultramarina Lawrence 1864H11
|--D. egregia Sclater 1855H11
| |--D. e. egregiaH11
| `--D. e. aequatorialis Berlepsch & Taczanowski 1884H11
|--D. flaviventer d’Orbigny & Lafresnaye 1837H11
|--D. hartlaubi Sclater 1855 [=Pseudodacnis hartlaubi]H11
|--D. lineata (Gmelin 1789) [=Motacilla lineata]H11
|--D. melanotisSS66
|--D. nigripes Pelzeln 1856H11
|--D. speciosaSS66
|--D. venusta Lawrence 1862H11
| |--D. v. venustaH11
| `--D. v. fuliginata Bangs 1908H11
`--D. viguieri Oustalet 1883H11
Dacnis cayana (Linnaeus 1766)H11 [=Motacilla cayanaH11; incl. Coereba cyaneaB94, Caereba (l. c.) cyaneaB94, Nectarinia cyanocephala cyaneaB94]
*Type species of generic name indicated
References
[B94] Bock, W. J. 1994. History and nomenclature of avian family-group names. Bulletin of the American Museum of Natural History 222: 1–281.
[H11] Hilty, S. L. 2011. Family Thraupidae (tanagers). In: Hoyo, J. del, A. Elliott & D. A. Christie (eds) Handbook of the Birds of the World vol. 16. Tanagers to New World Blackbirds pp. 46–329. Lynx Edicions: Barcelona.
[SS66] Sclater, P. L., & O. Salvin. 1866. Catalogue of birds collected by Mr. E. Bartlett on the River Uyacali, Eastern Peru, with notes and descriptions of new species. Proceedings of the Zoological Society of London 1866: 175–201.