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Fossil feathers from the Hawaiian flightless ibis (Apteribis sp.): plumage coloration and systematics of a prehistorically extinct bird

Published online by Cambridge University Press:  14 July 2015

Carla J. Dove
Affiliation:
Division of Birds, Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, P.O. Box 37012, Washington, DC, 20013-7012, USA, ,
Storrs L. Olson
Affiliation:
Division of Birds, Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, P.O. Box 37012, Washington, DC, 20013-7012, USA, ,

Abstract

A nearly complete skeleton of an adult Hawaiian flightless ibis (Apteribis sp.) was recovered from a vaulted dry lava tube in association with remains of contour feathers. This is the first documentation of the genus Apteribis from the island of Lanai and provides the only record of the nature of the plumage in any of the prehistorically extinct species of birds known from the Hawaiian Islands. Light and scanning electron microscope analyses of structure of the pennaceous and plumulaceous (downy) portions of these feathers confirmed their placement with the ibises (Threskiornithidae). Within that family, the microscopic structure of the downy feathers is most similar to that of the New World ibises of the genus Eudocimus, thus corroborating molecular evidence of the derivation of Apteribis from Eudocimus. Plumage color was a combination of brown-black and ivory-beige/light brown suggestive of that of juveniles of Eudocimus. Plumage coloration in Apteribis may thus have evolved through the same processes of paedomorphosis that gave rise to flightlessness.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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