Passerida

Passerida is under the Sibley-Ahlquist taxonomy, one of two "parvorders" contained within the suborder Passeri (standard taxonomic practice would place them at the rank of infraorder). While more recent research suggests that its sister parvorder, Corvida, is not a monophyletic grouping, the Passerida as a distinct clade are widely accepted.

Systematics and phylogeny
The Passerida quite certainly consist of the 3 major subclades outlined by Sibley & Ahlquist (1990). However, their content has been much revised. In addition, it has turned out that not all passeridan lineages neatly fit into this arrangement. The kinglets are so distinct that they might actually form a separate infraorder, as they are only slightly less basal than the Corvoidea or the Picathartidae. See Jønsson & Fjeldså (2006) for details on phylogeny.

Superfamily Melanocharitoidea
This superfamily only contains the berrypecker family.
 * Melanocharitidae: berrypeckers and longbills

Superfamily Cnemophiloidea
Like Melanocharitoidea, this superfamily is monotypic. They were once classed as birds-of-paradise.
 * Cnemophilidae: satinbirds

Superfamily Callaeoidea

 * Notiomystidae: Stitchbird
 * Callaeidae: New Zealand wattlebirds
 * Petroicidae: Australasian robins

Superfamily Picathartoidea

 * Picathartidae: rockfowl
 * Chaetopidae: rockjumpers
 * Eupetidae: Rail-babbler

Superfamily Paroidea

 * Stenostiridae: fairy flycatchers
 * Hyliotidae: hyliotas
 * Remizidae: penduline-tits
 * Paridae: parids

Superfamily Sylvioidea
Mostly insectivores, distribution centered on the Indo-Pacific region. Few occur in the Americas. Nicator-reedling-lark group
 * Nicatoridae: nicators
 * Panuridae: Bearded Reedling
 * Alaudidae: larks

Macrosphenidae group
 * Macrosphenidae: African warblers

Acrocephalus group
 * Pnoepygidae: wren-babblers. Formerly in Timaliidae.
 * Acrocephalidae: marsh- and tree-warblers. Recently split from Sylviidae.
 * Donacobiidae: donacobiuses. Formerly in Troglodytidae.
 * Bernieridae: Malagasy warblers. Members were formerly in Pycnonotidae, Timaliidae and Sylviidae.
 * Locustellidae: grass-warblers and allies. Recently split from Sylviidae.
 * Cisticolidae: cisticolas and allies. Recently split from Sylviidae.

Swallow-bulbul group
 * Hirundinidae: swallows and martins
 * Pycnonotidae: bulbuls

Hylia-aegithelid-cettiid/leaf-warbler group
 * Hyliidae: hylias
 * Aegithalidae: long-tailed tits
 * Cettiidae: ground-warblers and allies. Recently split from Sylviidae.
 * Phylloscopidae: leaf-warblers and allies. Recently split from Sylviidae.

Babbler clade
 * Sylviidae: sylviid warblers
 * Paradoxornithidae: parrotbills
 * Zosteropidae: white-eyes
 * Timaliidae: babblers
 * Pellorneidae: ground-babblers. Formerly in Timaliidae.
 * Leiothrichidae: laughingthrushes. Formerly in Timaliidae.

Superfamily Reguloidea
This superfamily only contains the kinglets.
 * Regulidae: kinglets

Superfamily Bombycilloidea

 * Elachuridae: Spotted Elachura
 * Mohoidae: Hawaiian honeyeaters
 * Ptilogonatidae: silky-flycatchers
 * Dulidae: Palmchat
 * Hypocoliidae: Grey Hypocolius and Hylocitrea
 * Bombycillidae: waxwings

Superfamily Certhioidea

 * Tichodromadidae: Wallcreeper
 * Sittidae: nuthatches and Spotted-creeper
 * Certhiidae: treecreepers
 * Polioptilidae: gnatcatchers
 * Troglodytidae: wrens

Superfamily Muscicapoidea
Mostly insectivores, near-global distribution centered on Old World tropics. One family is endemic to the Americas.

Oxpecker-mockingbird-starling clade
 * Buphagidae: oxpeckers. Formerly in Sturnidae.
 * Mimidae: mockingbirds and thrashers
 * Sturnidae: starlings and mynas

Dipper-thrush-Old World flycatcher clade
 * Cinclidae: dippers
 * Turdidae: thrushes and allies
 * Muscicapidae: Old World flycatchers and chats

Superfamily Passeroidea
Mostly herbivores, near-global distribution centered on Palearctic and Americas. Includes the Nine-primaried oscines (probably a subclade).

Basal Passeroidea
 * Promeropidae: sugarbirds
 * Arcanatoridae: Dapple-throat and allies
 * Dicaeidae: flowerpeckers
 * Nectariniidae: sunbirds
 * Irenidae: fairy-bluebirds
 * Chloropseidae: leafbirds

Core Passeroidea
 * Urocynchramidae: Przewalski's Finch. Recently split from Fringillidae.
 * Peucedramidae: Olive Warbler
 * Prunellidae: accentors

Estrildid clade
 * Ploceidae: weavers
 * Viduidae: indigobirds and whydahs
 * Estrildidae: estrildid finches (waxbills, munias, etc.)

Passerid clade
 * Passeridae: true sparrows

Nine-primaried oscines

 * Motacillidae: wagtails and pipits

Sibley and Monroe's (1990) Fringillidae
 * Fringillidae: true finches

Epifamily Icteroidae
 * Calcariidae: snow buntings and longspurs. Formerly in Emberizidae.
 * Rhodinocichlidae: Rosy Thrush-Tanager. Formerly in Thraupidae.
 * Emberizidae: buntings
 * Passerellidae: American sparrows
 * Phaenicophilidae: palm-tangers and allies
 * Incertae sedis: Teretistris and Zeledonia''
 * Icteridae: icterids
 * Parulidae: New World warblers
 * Mitrospingidae: mitrospingid tanagers
 * Cardinalidae: cardinals
 * Thraupidae: tanagers and allies