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Darwinopterus camposi, new pterosaur from Cretaceous of China + pterosaur wing bone laminarity (free pdfs)
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Ben Creisler
Mar 1, 2025, 2:55:08 PMMar 1
to DinosaurMa...@googlegroups.com
Ben Creisler
New pterosaur papers not yet mentioned:
Darwinopterus camposi sp. nov.
Xin Cheng, Shunxing Jiang, Renan A.M. Bantim, Juliana M. Sayão, Antônio Á.F. Saraiva, Xi Meng, Alexander W.A. Kellner & Xiaolin Wang (2025)
A new species of Darwinopterus (Wukongopteridae, Pterosauria) from western Liaoning provides some new information on the ontogeny of this clade
Anais da Academia Brasileira de Ciências 97(Suppl. 1): e20240707
doi: https://doi.org/10.1590/0001-3765202520240707
https://www.scielo.br/j/aabc/a/fbbdmLJJcwNKwxdPrtHDpVc/abstract/?lang=en
Free pdf:
https://www.scielo.br/j/aabc/a/fbbdmLJJcwNKwxdPrtHDpVc/?format=pdf&lang=en
The Wukongopteridae is an important pterosaur clade from the Yanliao Biota, combining features of basal and derived pterosaurs. So far, the Wukongopteridae consists of five species divided into three genera: Wukongopterus lii, Darwinopterus modularis, Darwinopterus linglongtaensis, Darwinopterus robustodens, and Kunpengopterus sinensis. Here we report a new species, Darwinopterus camposi sp. nov., based on an almost complete skeleton (IVPP V 17957). The new species is referred to Darwinopterus due to the presence of an elongated posterior region of the skull and the bony premaxillary crest that starts about the anterior margin of the nasoantorbital fenestra. It differs from all other wukongopterids by having the dorsal margin of the premaxillary crest straight, without an extensive dorsal projection and presenting a smooth lateral surface. Furthermore, D. camposi sp. nov. has eighteen and fourteen teeth on each side of the upper and lower jaws, respectively, and the fourth phalanx of the wing finger shorter than the first. IVPP V 17957 shows some fused postcranial bones, like the extensor tendon process to the first wing finger phalanx, but also has unfused premaxilla and frontal, which provides further information about wukongopterid ontogeny.
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Free pdf:
https://www.scielo.br/j/aabc/a/CytKXLqbgLtVSJQqJ4JfRmy/?format=pdf&lang=en
Powered flight has evolved separately in three tetrapod clades: pterosaurs, birds (avian dinosaurs), and bats. To meet the challenges of powered flight, tetrapods acquired structural, mechanical, and physiological adaptations. Circumferential vascular canals, forming laminar bone, have been proposed to be an adaptation linked to withstanding torsional loading during flight in birds. However, whether laminarity serves as an indicator of biomechanical torsion in pterosaurs, remains to be elucidated. Through a comparative statistical approach, we investigate the association between cortical bone laminarity and skeletal stress in pterosaur flight. For the first time, the presence of laminarity in pterosaur bones was analyzed to observe torsion in bones associated with flight, using thirty-five thin sections of the tapejarid Caiuajara dobruskii, Anhangueridae, and Dsungaripteroidea pterosaurs. We conclude that adaptive relationships arise between bone microstructure and biomechanical function, with forelimb elements (humerus, ulna, and wing phalanges) exhibiting higher laminarity rates compared to hindlimb bones. Additionally, the results provide insights into the possible flight style of these pterosaurs through comparison with bird groups. The presence of laminarity in pterosaurs and birds, but not in bats, highlights that this feature, once considered exclusive to birds, may have convergently evolved in pterosaurs and birds.
=======
Free pdf:
Darwinopterus camposi sp. nov.
Xin Cheng, Shunxing Jiang, Renan A.M. Bantim, Juliana M. Sayão, Antônio Á.F. Saraiva, Xi Meng, Alexander W.A. Kellner & Xiaolin Wang (2025)
A new species of Darwinopterus (Wukongopteridae, Pterosauria) from western Liaoning provides some new information on the ontogeny of this clade
Anais da Academia Brasileira de Ciências 97(Suppl. 1): e20240707
doi: https://doi.org/10.1590/0001-3765202520240707
https://www.scielo.br/j/aabc/a/fbbdmLJJcwNKwxdPrtHDpVc/abstract/?lang=en
Free pdf:
https://www.scielo.br/j/aabc/a/fbbdmLJJcwNKwxdPrtHDpVc/?format=pdf&lang=en
The Wukongopteridae is an important pterosaur clade from the Yanliao Biota, combining features of basal and derived pterosaurs. So far, the Wukongopteridae consists of five species divided into three genera: Wukongopterus lii, Darwinopterus modularis, Darwinopterus linglongtaensis, Darwinopterus robustodens, and Kunpengopterus sinensis. Here we report a new species, Darwinopterus camposi sp. nov., based on an almost complete skeleton (IVPP V 17957). The new species is referred to Darwinopterus due to the presence of an elongated posterior region of the skull and the bony premaxillary crest that starts about the anterior margin of the nasoantorbital fenestra. It differs from all other wukongopterids by having the dorsal margin of the premaxillary crest straight, without an extensive dorsal projection and presenting a smooth lateral surface. Furthermore, D. camposi sp. nov. has eighteen and fourteen teeth on each side of the upper and lower jaws, respectively, and the fourth phalanx of the wing finger shorter than the first. IVPP V 17957 shows some fused postcranial bones, like the extensor tendon process to the first wing finger phalanx, but also has unfused premaxilla and frontal, which provides further information about wukongopterid ontogeny.
====
Free pdf:
Esaú Victor de Araújo, Jorge Cubo, Mariana Valéria de Araújo Sena, Renan Alfredo Machado Bantim, Luiz Carlos Weinschütz, Alexander Wilhelm Armin Kellner & Juliana Manso Sayão
Wing bone laminarity in Pterosaurs: insights into torsional adaptations for flight evolution
Anais da Academia Brasileira de Ciências 97(Suppl. 1): e20240540
doi: https://doi.org/10.1590/0001-3765202520240540
https://www.scielo.br/j/aabc/a/CytKXLqbgLtVSJQqJ4JfRmy/abstract/?lang=en
Esaú Victor de Araújo, Jorge Cubo, Mariana Valéria de Araújo Sena, Renan Alfredo Machado Bantim, Luiz Carlos Weinschütz, Alexander Wilhelm Armin Kellner & Juliana Manso Sayão
Wing bone laminarity in Pterosaurs: insights into torsional adaptations for flight evolution
Anais da Academia Brasileira de Ciências 97(Suppl. 1): e20240540
doi: https://doi.org/10.1590/0001-3765202520240540
https://www.scielo.br/j/aabc/a/CytKXLqbgLtVSJQqJ4JfRmy/abstract/?lang=en
Free pdf:
https://www.scielo.br/j/aabc/a/CytKXLqbgLtVSJQqJ4JfRmy/?format=pdf&lang=en
Powered flight has evolved separately in three tetrapod clades: pterosaurs, birds (avian dinosaurs), and bats. To meet the challenges of powered flight, tetrapods acquired structural, mechanical, and physiological adaptations. Circumferential vascular canals, forming laminar bone, have been proposed to be an adaptation linked to withstanding torsional loading during flight in birds. However, whether laminarity serves as an indicator of biomechanical torsion in pterosaurs, remains to be elucidated. Through a comparative statistical approach, we investigate the association between cortical bone laminarity and skeletal stress in pterosaur flight. For the first time, the presence of laminarity in pterosaur bones was analyzed to observe torsion in bones associated with flight, using thirty-five thin sections of the tapejarid Caiuajara dobruskii, Anhangueridae, and Dsungaripteroidea pterosaurs. We conclude that adaptive relationships arise between bone microstructure and biomechanical function, with forelimb elements (humerus, ulna, and wing phalanges) exhibiting higher laminarity rates compared to hindlimb bones. Additionally, the results provide insights into the possible flight style of these pterosaurs through comparison with bird groups. The presence of laminarity in pterosaurs and birds, but not in bats, highlights that this feature, once considered exclusive to birds, may have convergently evolved in pterosaurs and birds.
=======
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