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Largest-known fossil penguin provides insight into the early evolution of sphenisciform body size and flipper anatomy

Published online by Cambridge University Press:  08 February 2023

Daniel T. Ksepka Open the ORCID record for Daniel T. Ksepka [Opens in a new window] ,
Daniel J. Field ,
Tracy A. Heath ,
Walker Pett ,
Daniel B. Thomas ,
Simone Giovanardi  and
Alan J.D. Tennyson
Daniel T. Ksepka*
Affiliation:
Bruce Museum, Greenwich, CT, USA
Daniel J. Field
Affiliation:
Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, UK Museum of Zoology, University of Cambridge, Cambridge, CB2 3EJ, UK
Tracy A. Heath
Affiliation:
Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA 50011, USA
Walker Pett
Affiliation:
Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA 50011, USA
Daniel B. Thomas
Affiliation:
School of Natural Sciences, Massey University, Auckland, 0632 New Zealand,
Simone Giovanardi
Affiliation:
School of Natural Sciences, Massey University, Auckland, 0632 New Zealand,
Alan J.D. Tennyson
Affiliation:
Museum of New Zealand Te Papa Tongarewa, PO Box 467, Wellington, New Zealand
*
*Corresponding author.
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Abstract

Recent fossil discoveries from New Zealand have revealed a remarkably diverse assemblage of Paleocene stem group penguins. Here, we add to this growing record by describing nine new penguin specimens from the late Paleocene (upper Teurian local stage; 55.5–59.5 Ma) Moeraki Formation of the South Island, New Zealand. The largest specimen is assigned to a new species, Kumimanu fordycei n. sp., which may have been the largest penguin ever to have lived. Allometric regressions based on humerus length and humerus proximal width of extant penguins yield mean estimates of a live body mass in the range of 148.0 kg (95% CI: 132.5 kg–165.3 kg) and 159.7 kg (95% CI: 142.6 kg–178.8 kg), respectively, for Kumimanu fordycei. A second new species, Petradyptes stonehousei n. gen. n. sp., is represented by five specimens and was slightly larger than the extant emperor penguin Aptenodytes forsteri. Two small humeri represent an additional smaller unnamed penguin species. Parsimony and Bayesian phylogenetic analyses recover Kumimanu and Petradyptes crownward of the early Paleocene mainland NZ taxa Waimanu and Muriwaimanu, but stemward of the Chatham Island taxon Kupoupou. These analyses differ, however, in the placement of these two taxa relative to Sequiwaimanu, Crossvallia, and Kaiika. The massive size and placement of Kumimanu fordycei close to the root of the penguin tree provide additional support for a scenario in which penguins reached the upper limit of sphenisciform body size very early in their evolutionary history, while still retaining numerous plesiomorphic features of the flipper.

UUID: https://zoobank.org/15b1d5b2-a5a0-4aa5-ba0a-8ef3b8461730

Type
Articles
Information
Journal of Paleontology , Volume 97 , Issue 2 , March 2023 , pp. 434 - 453
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Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Paleontological Society

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