… just a list (in alphabetical order) of the hypothetical birds (marked in green letters) that once may have existed within the Polynesian triangle, in a rather conservative approach!

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Acrocephalidae

Acrocephalus kerearako ssp. ”Atiu’
Acrocephalus kerearako ssp. ‘Ma’uke’
Acrocephalus musae ssp. ‘Bora Bora’
Acrocephalus musae ssp. ‘Maupiti’
Acrocephalus sp. ‘Austral Islands’
Acrocephalus sp. ‘Palmyra Atoll’

Alcedinidae

Todiramphus sp. ‘Makatea’
Todiramphus sp. ‘Me’eti’a’
Todiramphus sp. ‘Raivavae’
Todiramphus sp. ‘Rimatara’
Todiramphus sp. ‘Rurutu’
Todiramphus sp. ‘Tubuai’
Todiramphus tutus ssp. ‘Miti’aro’
Todiramphus ‘veneratus ssp.’ ‘Huahine’
Todiramphus ‘veneratus ssp.’ ‘Ra’iatea’

Anatidae

Anas sp. ‘Kiritimati’

Anatidae gen. & sp. ‘Ni’ihau Moa nalo’

Apodidae

Aerodramus sp. ‘Austral Islands’ 
Aerodramus sp. ‘Ma’uke’
Aerodramus sp. ‘Miti’aro’
Aerodramus sp. ‘Rarotonga’

Ardeidae

Butorides striata ssp. ‘Austral Islands’
Butorides striata ssp. ‘Cook Islands’
Butorides striata ssp. ‘Samoa’
Butorides striata ssp. ‘Tonga’

Nycticorax sp. ‘Samoa’ – may have survived on the Manu’a Islands (probably Ta’u) until the 1930s [3]

Columbidae

Ducula sp. ‘Pitcairn Island’

Macropygia sp. ‘Cook Islands’
Macropygia sp. ‘Fiji’
Macropygia sp. ‘Samoa’
Macropygia sp. ‘Tonga’

Pampusana sp. ‘Pitcairn Island’ [4]
Pampusana sp. ‘Raivavae’ [4]
Pampusana sp. ‘Rapa’ [4]
Pampusana sp. ‘Rimatara’ [4]

Ptilinopus sp. ‘Pitcairn Island’

Estrildidae

Erythrura sp. ‘Rotuma’
Erythrura sp. ‘Tonga’
Erythrura sp. ‘Wallis & Futuna’

Fringillidae

Chloridops sp. ‘Ni’ihau’

Hemignathus sp. ‘Ni’ihau’
Hemignathus sp. ‘Ni’ihau Akialoa’
Hemignathus sp. ‘Ni’ihau Nukupu’u’

Loxioides sp. ‘Ni’ihau’

Loxops sp. ‘Ni’ihau’

Magumma sp. ‘Ni’ihau’

Oreomystis sp. ‘Ni’ihau’

Paroreomyza montana ssp. ‘Kaho’olawe’

Rhodacanthis sp.’Ni’ihau’

Telespiza sp. ‘Ni’ihau’

Xestospiza sp. ‘Ni’ihau’

Hemiprocnidae

Hemiprocne (mystacina) ssp. ‘Fiji’ 

Hirundinidae

Hirundo javanica ssp. ‘Samoa’
Hirundo sp. ‘Austral Islands’ 
Hirundo sp. ‘Cook Islands’
Hirundo sp. ‘Mangareva’

Lamproliidae

Lamprolia sp. ‘Kadavu’
Lamprolia sp. ‘Viti Levu’

Locustellidae

Megalurulus rufa ssp. ‘Kadavu’
Megalurulus rufa ssp. Taveuni

Megapodiidae

Megapodius sp. ‘Rotuma’
Megapodius sp. ‘Samoa’
Megapodius sp. ‘Wallis & Futuna’

Meliphagidae

Gymnomyza sp. ‘Kadavu’

Myzomela sp. ‚Futuna‘
Myzomala sp. “Uvea‘

Mohoidae (endemic family)

Moho sp. ‘Ni’ihau’

Monarchidae

Monarcha sp. ‘Bora Bora’
Monarcha sp. ‘Huahine’
Monarcha sp. ‘Makatea’
Monarcha sp. ‘Mangaia’
Monarcha sp. ‘Maui Nui’
Monarcha sp. ‘Mo’orea’
Monarcha sp. ‘Ni’ihau’
Monarcha sp. ‘Ra’iatea/Taha’a’

Myiagra sp. ‘Rotuma’
Myiagra sp. ‘Tongatapu’

Motacillidae

Anthus novaeseelandiae ssp. ‘Macquarie Island’

Pachycephalidae

Pachycephala jacquinoti ssp. ‘Ha’apai Islands’
Pachycephala jacquinoti ssp. ‘Tongatapu’

Pandionidae

Pandion cristatus ssp. ‘Fiji’

Petroicidae

Petroica pusilla ssp. ”Eua’
Petroica pusilla ssp. ‘Tongatapu’
Petroica pusilla ssp. ‘Vava’u Islands’
Petroica pusilla ssp. ‘Wallis & Futuna’

Psittacidae

Cyanoramphus sp. ‘Bora Bora’
Cyanoramphus sp. ‘Cook Islands’
Cyanoramphus sp. ‘Huahine’
Cyanoramphus sp. ‘Raivavae’
Cyanoramphus sp. ‘Rimatara’
Cyanoramphus sp. ‘Rurutu’
Cyanoramphus sp. ‘Tubuai’
Cyanoramphus zealandicus ssp. ‘Mo’orea’

Eclectus infectus ssp. ‘Fiji’

Vini kuhlii ssp. ‘Society Islands’ – may have survived on Bora Bora until the 1830s [1]

Rallidae

Fulica sp. ‘Fiji’

Gallinula sp. ‘Tonga’

Gallirallus sp. ‘Aitutaki’
Gallirallus sp. ‘Alofi’
Gallirallus sp. ”Atiu’
Gallirallus sp. ‘Bora Bora’
Gallirallus sp. ‘Fatu Hiva’
Gallirallus sp. ‘Futuna’
Gallirallus sp. ‘Mai’ao’
Gallirallus sp. ‘Makatea’
Gallirallus sp. ‘Ma’uke’
Gallirallus sp. ‘Miti’aro’
Gallirallus sp. ‘Mo’orea’
Gallirallus sp. ‘Niau’
Gallirallus sp. ‘Ra’iatea’
Gallirallus sp. ‘Raivavae’
Gallirallus sp. ‘Rarotonga’
Gallirallus sp. ‘Rimatara’
Gallirallus sp. ‘Rotuma’
Gallirallus sp. ‘Savai’i’
Gallirallus sp. ‘Taveuni’
Gallirallus sp. ‘Ua Pou’
Gallirallus sp. ”Uvea’
Gallirallus sp. ”Upolu’

Porphyrio sp. ‘Bora Bora’
Porphyrio sp. ‘Fatu Hiva’
Porphyrio sp. ‘Mo’orea’
Porphyrio sp. ‘Nuku Hiva’
Porphyrio sp. ‘Rarotonga’
Porphyrio sp. ‘Tahiti’
Porphyrio sp. ‘Ua Huka’
Porphyrio sp. ‘Ua Pou’

Zapornia sp. ‘Aitutaki’
Zapornia sp. ‘Alofi’
Zapornia sp. ‘Anaa’
Zapornia sp. ”Atiu’
Zapornia sp. ‘Bora Bora’
Zapornia sp. ‘Eiao’
Zapornia sp. ‘Fatu Hiva’
Zapornia sp. ‘Futuna’
Zapornia sp. ‘Hiva Oa’
Zapornia sp. ‘Huahine’
Zapornia sp. ‘Kaho’olawe’
Zapornia sp. ‘Lana’i’
Zapornia sp. ‘Mai’ao’
Zapornia sp. ‘Makatea’
Zapornia sp. ‘Mangareva’
Zapornia sp. ‘Ma’uke’
Zapornia sp. ‘Maupiti’
Zapornia sp. ‘Me’eti’a’
Zapornia sp. ‘Miti’aro’
Zapornia sp. ‘Mohotani’
Zapornia sp. ‘Mo’orea’
Zapornia sp. ‘Niau’
Zapornia sp. ‘Ni’ihau’
Zapornia sp. ‘Pitcairn Island’
Zapornia sp. ‘Ra’iatea’
Zapornia sp. ‘Raivavaea’
Zapornia sp. ‘Rapa’
Zapornia sp. ‘Rarotonga’
Zapornia sp. ‘Rimatara’
Zapornia sp. ‘Rotuma’
Zapornia sp. ‘Rurutu’
Zapornia sp. ‘Savai’i’
Zapornia sp. ‘Taha’a’
Zapornia sp. ‘Tahuata’
Zapornia sp. ‘Tetiaroa’
Zapornia sp. ‘Tubuai’
Zapornia sp. ‘Tupai’
Zapornia sp. ‘Ua Pou’
Zapornia sp. ”Upolu’
Zapornia sp. ”Uvea

Rhipiduridae

Rhipidura sp. ”Eua’
Rhipidura sp. ‘Tongatapu’

Scolopacidae

Coenocorypha sp. ‘Kermadec Islands’
Coenocorypha sp. ‘Macquarie Island’

Strigidae

Grallistrix sp. ‘Lana’i’
Grallistrix sp. ‘Ni’ihau’

Sturnidae

Aplonis sp. ‘Austral Islands‘ 
Aplonis sp. ‘Bora Bora’
Aplonis sp. ‘Mangaia’ – may have survived into the late 19th/early 20th century [2]
Aplonis sp. ‘Mai’ao’
Aplonis sp. ‘Maupiti’
Aplonis sp. ‘Mo’orea’
Aplonis sp. ‘Tahiti’

Turdidae

Myadestes lanaiensis ssp. ‘Kaho’olawe’
Myadestes sp. ‘Ni’ihau’

Turdus sp. ‘Wallis & Futuna’

Zosteropidae

Zosteropidae gen. & sp. ‘Samoa’

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Let’s see which of ‘my’ hypothetical birds will be discovered in the future.   😛

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References:

[1] M. L. I. Duperrey: Voyage autour du monde: Exécuté par Ordre du Roi, Sur la Corvette de Sa Majesté, La Coquille, pendant les années 1822, 1823, 1824, et 1825, par M. L. I. Duperrey; Zoologie, par Mm. Lesson et Garnot. Paris: Arthus Bertrand 1828 
[2] F. W. Christian: List of Mangaia birds. The Journal of the Polynesian Society 29(114): 87. 1920
[3] J. S. Armstrong: Hand-list to the Birds of Samoa. John Bale, Sons and Danielsson, London 1932
[4] M. Bruce; N. Bahr; N. David: Pampusanna vs. Pampusana: a nomenclatural conundrum resolved, along with associated errors and oversights. Bulletin of the British Ornithologists‘ Club. 136: 86–100. 2016

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edited: 14.07.2020