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Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Subsectio: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Eusaurischia
Cladus: Theropoda
Cladus: Neotheropoda
Infraclassis: Aves
Ordo: Passeriformes
Subordo: Passeri
Infraordo: Passerida
Superfamilia: Passeroidea

Familia: Fringillidae
Subfamilia: Carduelinae
Genus: †Rhodacanthis
Species (4): R. flaviceps – R. forfex – R. litotes – R. palmeri

Rhodacanthis Rothschild, 1892


James, H.F.; Olson, S.L. 2005: The diversity and biogeography of koa-finches (Drepanidini: Rhodacanthis), with descriptions of two new species. Zoological journal of the Linnean Society, 144(4): 527–541. DOI: 10.1111/j.1096-3642.2005.00173.x

Rhodacanthis is an extinct genus of Hawaiian honeycreepers commonly known as koa finches. All four species were endemic to the Hawaiian Islands. Members of this genus were granivores, with bills adapted to the seeds and pods of legumes. The two species that became extinct in the 1890s, R. flaviceps and R. palmeri, inhabited upper elevation mesic forests dominated by koa (Acacia koa) on the island of Hawaiʻi.[1] Both were large birds; R. flaviceps measured 19 cm (7.5 in), while R. palmeri was 23 cm (9.1 in) in length.[2] The combination of a giant bill with brightly colored plumage (yellow for R. flaviceps, orange for R. palmeri) gave the males a very striking appearance. Koa seeds were the preferred food for the two species, but caterpillars were taken if necessary. The two prehistoric species, R. forfex and R. litotes, were denizens of more lowland tropical dry forests and shrublands on Kauaʻi, Maui, and Oʻahu. It is speculated that koaiʻa (Acacia koaia) was an important food source for both species, as their range did not overlap with that of koa. Kanaloa (Kanaloa spp.) pods and ʻaʻaliʻi (Dodonaea viscosa) berries were probably also eaten in addition to the occasional caterpillar.[1]

Rhodacanthis flaviceps Rothschild, 1892 – lesser koa finch (extinct, 1891)
Rhodacanthis forfex James & Olson, 2005 – scissor-billed koa finch (prehistoric)
Rhodacanthis litotes James & Olson, 2005 – primitive koa finch (prehistoric)
Rhodacanthis palmeri Rothschild, 1892 – greater koa finch (extinct, 1896)

See also

James, Helen F.; Storrs L. Olson (2005). "The diversity and biogeography of koa-finches (Drepanidini: Rhodacanthis), with descriptions of two new species" (PDF). Zoological Journal of the Linnean Society. Linnean Society of London. 144 (4): 527–541. doi:10.1111/j.1096-3642.2005.00173.x.


James, Helen F.; Johnathan P. Prince (May 2008). "Integration of palaeontological, historical, and geographical data on the extinction of koa-finches". Diversity & Distributions. 14 (3): 441–451. doi:10.1111/j.1472-4642.2007.00442.x.
Pratt, H Douglas (2002). The Hawaiian Honeycreepers. Oxford University Press. pp. 207–210. ISBN 978-0-19-854653-5.

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