Schlagwort-Archive: Cretaceous

SDSM 64281

SDSM 64281, also known as „Ornithurine C“ is mentioned in a study from 2011 that deals with the extinction of several bird clades at the end of the Cretaceous. [1]

This form is apparently known from at least one fragmented coracoid and comes from a bird that in life must have had a weight of about 3 kg. Unfortunatley the study fails to inform if this form is known from only the aforementioned single coracoid, and if not, if its remains were recovered only from the earliest Paleocene layers or if they were also recovered from the lates Cretaceous layers as it is the case with all other bird remains in the study.:

One of these species, Ornithurine C, is [also or only?] known from the Paleocene and therefore represents the only Maastrichtian bird known to cross the K–Pg boundary.“ 

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Apparently, this species is known from at least four coracoids or remains of such, and they are named as  „SDSM 64281A“, „SDSM 64281B“, „UCMP 175251“, and  „MOR 2918“ and most are indeed of Late Cretaceous age, but just not all of them.

According to the authors this species might be identical with a species that was named as Graculavus augustus Hope, a bird that apparently belongs to the Charadriiformes but was very much unlike any of the charadriiform birds living today, in life it may have appeared like some kind of giant stone-curlew aka. thick-knee. [2]

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References:

[1] Nicholas R. Longrich; Tim Tokaryk; Daniel J. Field: Mass extinction of birds at the Cretaceous-Paleogene (K-Pg) boundary. PNAS 108 (37) 15253-15257. 2011 
[2] Nicholas R. Longrich; Tim Tokaryk; Daniel J. Field: Mass extinction of birds at the Cretaceous-Paleogene (K-Pg) boundary. PNAS 108 (37) 15253-15257. 2011. Supplementary Information

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edited: 09.12.2019

Elal’s Mountain Swan – Kookne yeutensis

This new bird has recently been reported from Argentinia, and its name apparently is taken from the Aonikenk language, which is or was spoken by the Mapuche of southern Argentinia and its translation is given in the title.

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The new genus and species is known so far from a single bone, an incomplete right coracoid, whose „combination of characters strongly suggests anseriform affinities“.

That means that this species obvioulsy was an anseriform, some duck- or goose-like bird, more or less similar to other Late Cretaceous or Early Paleocene species.

Let’s see if there will be more remains to be discovered in the future.

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References:

[1] Fernando. E. Novas; Federico. L. Agnolin; Sebastián Rozadilla; Alexis M. Aranciaga-Rolando; Federico Brisson-Egli; Matias J. Motta; Mauricio Cerroni; Martín D. Ezcurra; Agustín G. Martinelli; Julia S. d ́Angelo; Gerardo Alvarez-Herrera; Adriel R. Gentil; Sergio Bogan; Nicolás R. Chimento; Jordi A. García-Marasà; Gastón Lo Coco; Sergio E. Miquel; Fátima F. Brito; Ezequiel I. Vera; Valeria S. Perez Loinaze; Mariela S. Fernández & Leonardo Salgado: Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina. Revista del Museo Argentino de Ciencias Naturales, n. s. 21(2): 217-293. 2019

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edited: 07.12.2019

A very snappy bird with strange trousers – Cruralispennia multidonta Wang et al.

This tiny thing could be called the „Cretaceous Nicobar Pigeon“, it had somewhat elongated neck feathers, the typical short tail, or rather a not-a-tail-at-all tail so typical for many of those strange Cretaceous enantiornithine birds that we now already know.

The strange-feathered creature comes from China, where it lived some 130 Million years ago in the late Early Cretaceous.

The genus name refers to its crural feathers (bird trousers) which are actually found in many birds, but here they are shaped like nothing ever seen before, maybe like a thin sheet of ceratin with a chewed end, or brush-like end, not at all like a feather. The species name again refers to its multi-toothed beak.

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a sketch of which I hope that I can produce a painting from some day ….

The bird reached a size of about 10 to maybe 11 or 12 cm when fully grown. The body feathers appear to have been more hair- than feather-like, and they may have been dark, while those on its neck were somewhat elongated and apparently were even glossy [1] … why not. 

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Unfortunatly I could not find any plant species from the same place and time.

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References:

[1] Min Wang; Jingmai K. O’Connor; Yanhong Pan; Zhonghe Zhou: A bizarre Early Cretaceous enantiornithine bird with unique crural feathers and an ornithuromorph plough-shaped pygostyle. Nature Communications 8: 1-12. 2017

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edited: 22.01.2019; 22.03.2019; 19.11.2019

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

Strange feet from the Cretaceous – Part 3

Enantiophoenix electrophyla Cau & Arduini from the Late Cretaceous of Lebanon, roughly the size of a recent European Starling.

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somewhat more than just a sketch, this piece took me some hours

This species is known from parts of a foot and some very few further remains.

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References:

[1] Andrea Cau & Paolo Arduini: Enantiophoenix electrophyla gen. et sp. nov. (Aves, Enantiornithes) from the Upper Cretaceous (Cenomanian) of Lebanon and its phylogenetic relationships. ATTI della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano 149(2): 293-324. 2008

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edited: 14.07.2019

Strange feet from the Cretaceous – Part 1

Elektorornis chenguangi Xing, O’Connor, Chiappe, McKellar, Carroll, Hu, Bai & Lei, a bird from the Cretaceous era described just now.

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just a quick life-sized (!) sketch, gummy bear for size comparison

This bird is known only by a single leg with an unusually elongated middle toe and parts of the wing.

I will come back to that bird somewhat later ….

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References:

[1] Lida Xing; Jingmai K. O’Connor; Luis M. Chiappe; Ryan C. McKellar; Nathan Carroll; Han Hu; Ming Bai; Fuming Lei: A new enantiornithine bird with unusual pedal proportions found in amber. Current Biology 29: 1-6. 2019

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edited: 12.07.2019

And yet another sketch …

… this time of Eoalulavis hoyasi Sanz, Chiappe, Perez-Moreno, Buscalioni, Moratalla, Ortega & Poyato-Ariza.

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This probably somewhat semiaquatic bird was described in 1996 from Las Hoyas near the city of Cuenca, Spain.  The decomposing plant in the background is a cycad, Almargemia dentata (Heer) Florin, from roughly about the same place and time.

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edited: 13.07.2017