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1 April 2009 Affinities of Palaeospiza bella and the Phylogeny and Biogeography of Mousebirds (Coliiformes)
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Palaeospiza bella was described as an oscine songbird in the late 19th century. The late Eocene age of the holotype specimen would make it the oldest Northern Hemisphere record of the Passeriformes. However, few recent workers have accepted the placement of P. bella within Passeriformes, and the higher relationships of this fossil have remained controversial. We show that P. bella is a member of the Coliiformes (mousebirds) and represents the latest North American occurrence of a clade with an exclusively African extant distribution. Coliiformes are now known from the latest Paleocene to the approach of the Eocene-Oligocene boundary in North America. We present a redescription of P. bella and a new phylogenetic analysis of fossil and living Coliiformes based on a matrix including 49 characters and 18 ingroup taxa. The results of this analysis place P. bella in Colii, the clade comprising taxa more closely related to Coliidae (crown mousebirds) than to the extinct Sandcoleidae. The oldest stem-group Coliiformes are late Paleocene (about 56.2–56.6 Ma) in age. However, no fossil taxon can be confidently placed within the crown clade Coliidae at present. Phylogenetic results imply that a minimum of three mousebird dispersals from Europe to North America occurred during the Early Cenozoic. Review of the early Eocene fossil Eocolius walkeri from the London Clay shows that this taxon lacks convincing coliiform synapomorphies and should be removed from the clade.

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Daniel T. Ksepka and Julia A. Clarke "Affinities of Palaeospiza bella and the Phylogeny and Biogeography of Mousebirds (Coliiformes)," The Auk 126(2), 245-259, (1 April 2009).
Received: 22 October 2007; Accepted: 1 August 2008; Published: 1 April 2009

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