First partial skeleton of Delphinornis larseni Wiman, 1905, a slender-footed penguin from the Eocene of Antarctic Peninsula

Jadwiszczak, Piotr; Mörs, Thomas

doi:10.26879/933

Cited by 7 publications

(11 citation statements)

References 44 publications

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“…Although apparent, the medial intertarsal groove is shallower than that of all comparable extant species. The lateral intertarsal groove is present and deep, similar to the condition in extant species as well as the extinct taxa Delphinornis, Marambiornis, and Mesetaornis (Myrcha et al, 2002;Jadwiszczak & Mörs, 2019). The groove does not taper strongly distally, as in Marambiornis and Mesetaornis.…”

Section: Systematic Paleontologysupporting

confidence: 59%

“…The plantar opening of the distal vascular foramen is more distally positioned (Fig. 4B) than in Marambiornis and Mesetaornis and is similar in morphology to that of Delphinornis (Myrcha et al, 2002;Jadwiszczak & Mörs, 2019). Based on these traits, we assign this fossil to Delphinornis.…”

Section: Systematic Paleontologymentioning

confidence: 64%

“…The distally-opening passage of the m. extensor brevis digiti IV is confluent with the distal vascular foramen (Fig. 4A), as in Delphinornis, Marambiornis, and Mesetaornis (Myrcha et al, 2002;Hoffmeister, 2014;Jadwiszczak, 2015;Jadwiszczak & Mörs, 2019). The plantar opening of the distal vascular foramen is more distally positioned (Fig.…”

Section: Systematic Paleontologymentioning

confidence: 93%

“…A distal vascular foramen is present (Figs. 4A-4B) as in taxa from the Paleocene of New Zealand, including Muriwaimanu, as well as the small Antarctic taxa Delphinornis, Marambiornis, and Mesetaornis (Myrcha et al, 2002;Chávez Hoffmeister, 2014;Jadwiszczak, 2015;Jadwiszczak & Mörs, 2019). The distally-opening passage of the m. extensor brevis digiti IV is confluent with the distal vascular foramen (Fig.…”

Section: Systematic Paleontologymentioning

confidence: 96%

“…The trochlea of metatarsal II is positioned more medially than those of all comparable extant penguin species (Figs. 4A-4B and 4D), resulting in a wide medial intertrochlear incisure that appears most similar to that of Delphinornis (Myrcha et al, 2002;Jadwiszczak & Mörs, 2019). A distal vascular foramen is present (Figs.…”

Section: Systematic Paleontologymentioning

confidence: 96%

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New mammalian and avian records from the late Eocene La Meseta and Submeseta formations of Seymour Island, Antarctica

Davis

Torres

Musser

et al. 2020

PeerJ

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The middle–late Eocene of Antarctica was characterized by dramatic change as the continent became isolated from the other southern landmasses and the Antarctic Circumpolar Current formed. These events were crucial to the formation of the permanent Antarctic ice cap, affecting both regional and global climate change. Our best insight into how life in the high latitudes responded to this climatic shift is provided by the fossil record from Seymour Island, near the eastern coast of the Antarctic Peninsula. While extensive collections have been made from the La Meseta and Submeseta formations of this island, few avian taxa other than penguins have been described and mammalian postcranial remains have been scarce. Here, we report new fossils from Seymour Island collected by the Antarctic Peninsula Paleontology Project. These include a mammalian metapodial referred to Xenarthra and avian material including a partial tarsometatarsus referred to Gruiformes (cranes, rails, and allies). Penguin fossils (Sphenisciformes) continue to be most abundant in new collections from these deposits. We report several penguin remains including a large spear-like mandible preserving the symphysis, a nearly complete tarsometatarsus with similarities to the large penguin clade Palaeeudyptes but possibly representing a new species, and two small partial tarsometatarsi belonging to the genus Delphinornis. These findings expand our view of Eocene vertebrate faunas on Antarctica. Specifically, the new remains referred to Gruiformes and Xenarthra provide support for previously proposed, but contentious, earliest occurrence records of these clades on the continent.

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Section: Systematic Paleontologysupporting

confidence: 59%

Section: Systematic Paleontologymentioning

confidence: 64%