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[dinosaur] New Eocene accipitrid species from Wyoming + new Pliocene penguin from New Zealand

Ben Creisler

Recent Cenozoic avian papers:

?Palaeoplancus dammanni n.âsp.Â

Gerald Mayr & ÂThomas Perner (2020)
A new species of diurnal birds of prey from the late Eocene of Wyoming (USA) â one of the earliest New World records of the Accipitridae (hawks, eagles, and allies).
Neues Jahrbuch fÃr Geologie und PalÃontologie - Abhandlungen 297(2): 205 - 215
DOI: 10.1127/njgpa/2020/0921

We describe a new species of the Accipitridae (hawks, eagles, and allies) from the late Eocene of North America. ?Palaeoplancus dammanni n.âsp. is based on a nearly complete tarsometatarsus from the Chadronian of Wyoming (USA) and is the fifth accipitrid species from the White River Group. If correctly assigned to the taxon Palaeoplancus, the new species is likely to be a stem group representative of the Accipitridae, and together with âButeoâ antecursor it is among the earliest New World records of the Accipitridae. Some of the diagnostic features of ?P. dammanni indicate a strong development of muscles controlling the hallux andâsecond toe, which are likely to have been correlated with a particular â albeit unknown â foraging behavior or prey type.


Free pdf:

Eudyptes atatu sp. nov.Â

Daniel B. Thomas, Alan J. D. Tennyson, R. Paul Scofield, Tracy A. Heath, Walker Pett and Daniel T. Ksepka (2020)
Ancient crested penguin constrains timing of recruitment into seabird hotspot.
Proceedings of the Royal Society B: Biological Sciences 287(1932): 20201497
doi: https://doi.org/10.1098/rspb.2020.1497

Free pdf:

New Zealand is a globally significant hotspot for seabird diversity, but the sparse fossil record for most seabird lineages has impeded our understanding of how and when this hotspot developed. Here, we describe multiple exceptionally well-preserved specimens of a new species of penguin from tightly dated (3.36â3.06 Ma) Pliocene deposits in New Zealand. Bayesian and parsimony analyses place Eudyptes atatu sp. nov. as the sister species to all extant and recently extinct members of the crested penguin genus Eudyptes. The new species has a markedly more slender upper beak and mandible compared with other Eudyptes penguins. Our combined evidence approach reveals that deep bills evolved in both crested and stiff-tailed penguins (Pygoscelis) during the Pliocene. That deep bills arose so late in the greater than 60 million year evolutionary history of penguins suggests that dietary shifts may have occurred as wind-driven Pliocene upwelling radically restructured southern ocean ecosystems. Ancestral area reconstructions using BioGeoBEARS identify New Zealand as the most likely ancestral area for total-group penguins, crown penguins and crested penguins. Our analyses provide a timeframe for recruitment of crown penguins into the New Zealand avifauna, indicating this process began in the late Neogene and was completed via multiple waves of colonizing lineages.


Ancient crested penguin fossil found in New ZealandÂ



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