Fossil Counterparts of Giant Penguins from the North Pacific

@article{Olson1979FossilCO,
  title={Fossil Counterparts of Giant Penguins from the North Pacific},
  author={Storrs L. Olson and Yoshikazu Hasegawa},
  journal={Science},
  year={1979},
  volume={206},
  pages={688 - 689}
}
New fossils of giant, flightless penguinlike birds have been found in late Oligocene and early Miocene rocks in Japan and in the state of Washington. These birds belong to the order Pelecaniformes, in the extinct family Plotopteridae, previously known by a single fragment of bone from California. Hindlimb and pelvic morphology is most similar to that of Recent anhingas, but the wing is paddlelike and remarkably convergent toward penguins and flightless auks. Both the Plotopteridae and the giant… 
A new genus of penguin-like pelecaniform bird from the Oligocene of Washington (Pelecaniformes: Plotopteridae)
  • S. Olson
  • Biology
    Contributions in science
  • 1980
New specimens from the state of Washington, USA, and from Japan show that the family Plotopteridae Howard, previously known only from a portion of a coracoid from the early Miocene of California,
A new penguin-like bird (Pelecaniformes:Plotopteridae) from the Late Oligocene Tokoro Formation, northeastern Hokkaido, Japan
TLDR
The skeleton of a large bird from Late Oligocene marine strata of the Tokoro Formation, exposed near Abashiri City in northeastern Hokkaido, Japan, represents a new genus and species of the extinct pelecaniform family Plo- topteridae, but differs from that species chiefly in characters of the anterior parts of the skeleton.
A new genus and two new species of gigantic Plotopteridae from Japan (Aves: Pelecaniformes)
TLDR
A new genus and species of wing-propelled, penguin-like diving birds of the order Pelecaniformes found in mid-Tertiary deposits of the North Pacific are named here from previously known but underscribed material upon which much of the authors' knowledge of the family had originally been based.
Fossil Plotopterid Seabirds from the Eo-Oligocene of the Olympic Peninsula (Washington State, USA): Descriptions and Functional Morphology
TLDR
The descriptions and functional results suggest that Tonsala buchanani sustained similar loads in walking, but slightly lower humeral loads during swimming, than a modern penguin, which suggests a swimming mode that is more similar to living alcids, than to the highly-specialised locomotor strategy of living and fossil penguins.
An ornithurine bird from the Late Cretaceous of Alberta, Canada
The partial carpometacarpus of a basal ornithurine bird from the late Campanian of Dinosaur Provincial Park is described. Complete proximal fusion of the wrist and the presence of a pisiform process
New Late Eocene and Oligocene Remains of the Flightless, Penguin-Like Plotopterids (Aves, Plotopteridae) from Western Washington State, U.S.A.
TLDR
Four new plotopterids from late Eocene and Oligocene strata in western Washington State are described and three of which are named and assigned to two new supraspecific taxa, Olympidytes and Klallamornis, gen. nov.
EARLIEST PACIFIC BASIN RECORD OF THE PELAGORNITHIDAE (AVES: PELECANIFORMES)
GERARDO GONZALEZ-BARBA', TOBIAS SCHWENNICKE', JAMES L. GOEDERT2, and LAWRENCE G. BARNES3, 1Departamento de Geologia Marina, Universidad Aut6noma de Baja California Sur, La Paz, Mexico; 2Geology
Pleistocene seabirds from Shiriya, northeast Japan: systematics and oceanographic context
ABSTRACT Seabirds are higher-order predators in the marine ecosystem and hence good indicators of the marine environment. Although the North Pacific has been the focal area for investigations of
Morphometric patterns in Recent and fossil penguins (Aves, Sphenisciformes)
  • B. Livezey
  • Environmental Science
    Journal of zoology
  • 1989
TLDR
Investigation of morphometric patterns within and among the 18 Recent species of Spheniscidae indicated that the families differ in a relatively complex skeletal dimension that only in part reflects overall size, and the need for a phylogenetic analysis of this highly specialized family of winged‐propelled diving birds is stressed.
Bone histology in extant and fossil penguins (Aves: Sphenisciformes)
TLDR
New observations on the long bone microstructure of penguins are presented, based on histological sections from two extant taxa and eight fossil specimens belonging to stem lineages, indicating that the modification of flipper boneMicrostructure continued long after the initial loss of flight in penguins.
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References

SHOWING 1-5 OF 5 REFERENCES
A New Avian Fossil from Kern County, California
The first avian fossil from the Pyramid Hill sands of the San Joaquin Valley, Kern County, California, was presented to the Los Angeles County Museum of Natural History in 1964 by Mr. Dick Bishop of
preparing, or providing information on specimens
  • For collecting,
  • 1979
Japanese specimens are from the Asagai, Ashiya, Hatazu, and Nishisonogi formations [see Y. Hasegawa
  • Proc. 1st Int
  • 1977
For collecting, preparing, or providing information on specimens we thank
The length of a recently collected synsacrum of Anthropornis nordenskjoeldii, the largest or next to largest of the giant fossil penguins