Schlagwort-Archive: Oligocene

Winnicavis gorskii Bocheński, Tomek, Wertz, Happ, Bujoczek & Świdnicka

This is the “newest” of the European Oligocene birds with “brittly limbs”, this time only the wingbones are preserved. These are unlike the wingbones of any other passerine bird known so far, extant or extinct.

The bird was small, about the size of a Great Tit (Parus major L.), I will see if I am able to make some kind of reconstruction, whatsoever. [1]

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References:

[1] Zbigniew M. Bocheński, Teresa Tomek, Krzysztof Wertz, Johannes Happ, Małgorzata Bujoczek & Ewa Świdnicka: Articulated avian remains from the early Oligocene of Poland adds to our understanding of Passerine evolution. Palaeontologia Electronica 21(2). 2018

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Let’s have a little update here.

I’ve made a little sketch, based on a Great Tit, however, knowing that this bird was not related to any of the modern Passeriformes, I thought of a little songbird-like creature resembling some of the Australian/Papuan “primitive” songbirds.

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my reconstruction, the bird reached a size of about 15 cm or in other words was indeed about the size of a Great Tit; remember, only the wing bones and some impressions of several wing feathers are known

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edited: 24.09.2018; 14.08.2019

ZPALWr. A/4003

We spoke about Oligocene birds with brittly legs before … this one is a small fossil, a slab and its counter slab of course containing a single foot, a ca. 3,6 cm long right foot only retaining the first and the second toe.

This partial foot was compared to many other bird forms and it was found that it most closely resembled the foot of columbiform birds, that is pigeons and doves.

If this indeed was a columbiform bird it is now the oldest known of its kind – since true pigeons and doves actually apear in the fossil record quite late, with the oldest remains coming from the Miocene era respectively from the border of the Late Oligocene and the Early Miocene.

However, ZPALWr. A/4003, being only a partial foot, is not enough to fully constitute its taxonomic affinities. [1]

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Assuming that this fossil indeed is of a true a pigeon, it must have reached a life size of about 25 cm.

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References:

[1] Zbigniew M. Bocheński; Teresa Tomek; Ewa Świdnicka: A columbid-like avian foot from the Oligocene of Poland. Acta Ornithologica 45(2): 233-236. 2010

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edited: 11.08.2019

The fossil record of birds from the James Ross Basin, West Antarctica

You may know that I’m a bit obsessed with the birds of the Paleocene era, partly because we know so much of a nothing about them, especially about those from the Early Paleocene, the beginning of the „T-time“, the time immediately after the K/T extinction event.

Now, there’s now a new paper out that is somewhat a review of the birds that existed at around exactly this time, the K/T boundary … on the continent of Antarctica to be more precicely, but also beyond that time up to the Oligocene. [1]

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I have not yet read it completely, but since nearly all bird fossils from that area are limited to single bones or sometimes partial skeletons, it does not shed so much new light on the previous records.

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References:

[1] Carolina Acosta Hospitaleche; Piotr Jadwiszczak; Julia A. Clarke; Marcos Cenizo: The fossil record of birds from the James Ross Basin, West Antarctica. Advances in Polar science 30(3): 250-272. 2019

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edited: 25.07.2019