The taxon comprises ~150 species in ~9 families. 

Genus-level classification of extant Picidae. 

References

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Benz BW, Robbins MB, and Zimmer KJ (2015), Phylogenetic relationships of the Helmeted Woodpecker (Dryocopus galeatus): a case of interspecific mimicry?, Auk 132, 938-950. (free pdf)

Bi D, Ding H, Wang Q, Jiang L, Lu W, Wu X, Zhu R, Zeng J, Zhou S, Yang X, and Kan X (2019), Two new mitogenomes of Picidae (Aves, Piciformes): sequence, structure and phylogenetic analyses, Int. J. Biol. Macromol. 133, 683-692. (abstract)

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Johansson US, and Ericson PGP (2003), Molecular support for a sister group relationship between Pici and Galbulae (Piciformes sensu Wetmore 1960), J. Avian Biol. 34, 185-197. (abstract)

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Ogolowa BO, Brelsford A, Fjeldså J, Fulgione A, Hadjioannou L, Henderson EC, Moyle RG, Moysi M, Nwankwo EC, Rancilhac L, Smith TB, von Holdt BM, and Kirschel ANG (2025), Plio-Pleistocene climatic fluctuations and divergence with gene flow drive continent-wide diversification in an African bird, Mol. Evol. 34, e:17770. (pdf)

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Ostrow EN, Catanach TA, Bates JM, Aleixo A, and Weckstein JD (2023), Phylogenomic analysis confirms the relationships among toucans, toucan-barbets, and New World barbets but reveals paraphyly of Selenidera toucanets and evidence for mitonuclear discordance, Ornithology 140, e:ukad022. (free pdf)

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Sangster G, Gregory SMS, and Dickinson EC (2023), The correct authorship of the family-group name Nesoctitini (Picidae), Avian Syst. 2, 1-3. (pdf)

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Tamashiro RA, White NE, Braun MJ, Faircloth BC, Braun EL, and Kimball RE (2019), What are the roles of taxon sampling and model fit in tests of cyto-nuclear discordance using avian mitogenomic data?, Mol. Phylogenet. Evol. 130, 132-144. (abstract)

Webb DM, and Moore (2005), A phylogenetic analysis of woodpeckers and their allies using 12S, Cyt b, and COI nucleotide sequences (class Aves; order Piciformes), Mol. Phylogenet. Evol. 36, 233-248. (abstract)

Witt CC (2004), “Rates of molecular evolution and their application to neotropical avian biogeography”, Ph.D. dissertation, Louisiana State University. (pdf)