Belongs within: Picidae.
Picumnus, piculets, is a genus of small, short-tailed woodpeckers with laterally converging white bars on the outer tail feathers and a white stripe on the central feathers (Winkler & Christie 2002).
Picumnus Temminck 1825B94
|--P. innominatus Burton 1836BKB15, WC02
| |--P. i. innominatus [incl. P. simlaensis]WC02
| |--P. i. chinensis (Hargitt 1881)WC02
| `--P. i. malayorum Hartert 1912 [incl. P. avunculorum]WC02
`--+--P. nebulosus Sundevall 1866BKB15, WC02
`--+--+--+--P. pygmaeus (Lichtenstein 1823)SF17, WC02 [=Picus pygmaeusWC02]
| | `--P. varzeae Snethlage 1912SF17, WC02
| `--+--+--P. minutissimus (Pallas 1782)SF17, WC02 [=Picus minutissimusWC02]
| | `--P. spilogaster Sundevall 1866SF17, WC02
| | |--P. s. spilogaster [incl. P. leucogaster]WC02
| | |--P. s. orinocensis Zimmer & Phelps 1950WC02
| | `--P. s. pallidus Snethlage 1924WC02
| `--+--P. temminckii Lafresnay 1845SF17, WC02
| `--+--P. steindachneri Taczanowski 1882SF17, WC02
| `--+--P. albosquamatus d’Orbigny 1840SF17, WC02 [incl. P. albosquamatus corumbanusWC02]
| | |--P. a. albosquamatusWC02
| | `--P. a. guttifer Sundevall 1866 [incl. P. asterias, P. sagittatus]WC02
| `--+--P. cirratus Temminck 1825SF17, WC02
| | |--P. c. cirratusWC02
| | |--P. c. confusus Kinnear 1927WC02
| | |--P. c. macconnelli Sharpe 1901WC02
| | |--P. c. pilcomayensis Hargitt 1891WC02
| | |--P. c. thamnophiloides Bond & Meyer de Schauensee 1942WC02
| | `--P. c. tucumanus Hartert 1909WC02
| `--P. dorbignyanus Lafresnaye 1845SF17, WC02 [=P. dorbygnianus (l. c.)WC02]
| |--P. d. dorbignyanusWC02
| `--P. d. jelskii Taczanowski 1882WC02
`--+--+--P. castelnau Malherbe 1862SF17, WC02
| `--P. subtilis Stager 1968SF17, WC02
`--+--P. rufiventris (Bonaparte 1837)BKB15, SS66 [=Asthenurus rufiventrisSS66]
| |--P. r. rufiventrisWC02
| |--P. r. brunneifrons Stager 1968WC02
| `--P. r. grandis Carriker 1930WC02
`--+--+--P. exilis (Lichtenstein 1823)BKB15, WC02 [=Picus exilisWC02]
| | |--P. e. exilisWC02
| | |--P. e. alegriae Hellmayr 1929WC02
| | |--P. e. buffoni Lafresnaye 1845WC02
| | |--P. e. clarus Zimmer & Phelps 1946WC02
| | |--P. e. pernambucensis Zimmer 1947WC02
| | |--P. e. salviniSF17
| | `--P. e. undulatus Hargitt 1889WC02
| `--P. squamulatus Lafresnaye 1854SF17, WC02
| |--P. s. squamulatusWC02
| |--P. s. apurensis Phelps & Aveledo 1987WC02
| |--P. s. lovejoyi Phelps & Aveledo 1987WC02
| |--P. s. obsoletusWC02
| `--P. s. rohli Zimmer & Phelps 1944WC02
`--+--+--P. lafresnayi Malberbe 1862SF17, WC02
| | |--P. l. lafresnayiWC02
| | |--P. l. punctifrons Taczanowski 1886WC02
| | |--P. l. pusillus Pinto 1936WC02
| | `--P. l. taczanowskii Domaniewski 1925WC02
| `--P. pumilus Cabanis & Heine 1863WC02
`--+--P. aurifrons Pelzeln 1870BKB15, WC02
| |--P. a. aurifronsWC02
| |--P. a. borbae Pelzeln 1870WC02
| |--P. a. flavifrons Hargitt 1889WC02
| |--P. a. juruanus Gyldenstolpe 1941WC02
| |--P. a. purusianus Todd 1946WC02
| |--P. a. transfasciatus Hellmayr & Gyldenstolpe 1937WC02
| `--P. a. wallacii Hargitt 1889WC02
`--+--P. olivaceus Lafresnaye 1845SF17, WC02
| |--P. o. olivaceus [incl. P. malleolus]WC02
| |--P. o. dimotus Bangs 1903WC02
| |--P. o. eisenmanni Phelps & Aveledo 1966 (see below for synonymy)WC02
| |--P. o. flavotinctus Ridgway 1889 [incl. P. olivaceus panamensis]WC02
| |--P. o. harterti Hellmayr 1909WC02
| `--P. o. tachirensis Phelps & Gilliard 1941WC02
`--P. sclateri Taczanowski 1877SF17, WC02
|--P. s. sclateriWC02
|--P. s. parvistriatus Chapman 1921WC02
`--P. s. porcullae Bond 1954WC02
Picumnus incertae sedis:
P. cinnamomeus Wagler 1829WC02
|--P. c. cinnamomeusWC02
|--P. c. perijanus Zimmer & Phelps 1944WC02
|--P. c. persaturatus Haffer 1961WC02
`--P. c. venezuelensis Cory 1913WC02
P. fulvescens Stager 1961 [incl. P. limae saturatus]WC02
P. fuscus Pelzeln 1870WC02
P. granadensis Lafresnaye 1847WC02
|--P. g. granadensisWC02
`--P. g. antioquensis Chapman 1915WC02
P. limae Snethlage 1924WC02
P. nigropunctatus Zimmer & Phelps 1950AP21, WC02
Picumnus olivaceus eisenmanni Phelps & Aveledo 1966 [incl. P. olivaceus perijanus non Zimmer & Phelps 1944]WC02
*Type species of generic name indicated
References
[AP21] Arlott, N., & B. van Perlo. 2021. Collins Birds of the World. William Collins.
[B94] Bock, W. J. 1994. History and nomenclature of avian family-group names. Bulletin of the American Museum of Natural History 222: 1–281.
[BKB15] Burleigh, J. G., R. T. Kimball & E. L. Braun. 2015. Building the avian tree of life using a large-scale, sparse supermatrix. Molecular Phylogenetics and Evolution 84: 53–63.
[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.
[SF17] Shakya, S. B., J. Fuchs, J.-M. Pons & F. H. Sheldon. 2017. Tapping the woodpecker tree for evolutionary insight. Molecular Phylogenetics and Evolution 116: 182–191.
[WC02] Winkler, H., & D. A. Christie. 2002. Family Picidae (woodpeckers). In: Hoyo, J. del, A. Elliott & J. Sargatal (eds) Handbook of the Birds of the World vol. 7. Jacamars to Woodpeckers pp. 296–555. Lynx Edicions: Barcelona.