Bush-warbler

The Japanese bush-warbler (Horornis diphone) probably belongs in a different genus.

Bush-warblers (or bush warblers) are small insectivorous songbirds belonging to the genera Cettia, Horornis, and Bradypterus. They were formerly placed in the "wastebin" Old World warbler family. Neither genus as traditionally delimited is believed to be monophyletic.^[1]

Due to their external similarity convergently acquired by strong selective pressures due to the identical habitat, they were occasionally believed to be close relatives. However, they belong to two well-distant families in the Sylvioidea, the "warbler-and-babbler" superfamily:

Cettia, the cettiid bush-warblers or typical bush-warblers, belong in the Cettiidae, an ancient sylvioid lineage related to long-tailed tits.^[1]
Horornis, the horornid bush-warblers, also belonging in the Cettiidae, an ancient sylvioid lineage related to long-tailed tits.^[1]
Bradypterus, the megalurid bush-warblers, belong to in the Megaluridae, the grass-warbler family which is closely related to the Malagasy warblers and the peculiar black-capped donacobius from South America, formerly believed to be an aberrant wren.^[1]

Footnotes

1 2 3 4 Alström et al. (2006)

References

Alström, P.; Ericson, P.G.P.; Olsson, U. & Sundberg, P. (2006): Phylogeny and classification of the avian superfamily Sylvioidea. Mol. Phylogenet. Evol. 38(2): 381–397. doi:10.1016/j.ympev.2005.05.015 PMID 16054402 PDF fulltext

Genera and members of the Cettiidae family

Genera	Pholidornis – tit hylia (formerly in Remizidae) Hylia – green hylia (tentatively placed here) Abroscopus – Abroscopus warblers (3 species) Urosphena – stubtails (5 species) Tesia – tesias (5 species) Horornis – (14 species) Cettia – typical bush warblers (4 species) Tickellia – broad-billed warbler Phyllergates - (2 species) Scotocerca - streaked scrub warbler

Abroscopus	Black-faced warbler Rufous-faced warbler Yellow-bellied warbler

Cettia	Bush-warbler Cetti's warbler Chestnut-crowned bush warbler Chestnut-headed tesia Grey-sided bush warbler

Horornis	Aberrant bush warbler Bougainville bush warbler Brown-flanked bush warbler Fiji bush warbler Hume's bush warbler Japanese bush warbler Manchurian bush warbler Palau bush warbler Philippine bush warbler Shade bush warbler Sunda bush warbler Tanimbar bush warbler Yellow-bellied bush warbler

Phyllergates	Mountain tailorbird Rufous-headed tailorbird

Urosphena	Asian stubtail Bornean stubtail Neumann's warbler Pale-footed bush warbler Timor stubtail

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