Bone histological correlates for air sacs and their implications for understanding the origin of the dinosaurian respiratory system

Markus Lambertz, Filippo Bertozzo, P. Martin Sander

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Air sacs are an important component of the avian respiratory system, and corresponding structures also were crucial for the evolution of sauropod dinosaur gigantism. Inferring the presence of air sacs in fossils so far is restricted to bones preserving internal pneumatic cavities and foramina as osteological correlates. We here present bone histological correlates for air sacs as a new potential identification tool for these elements of the respiratory system. The analysis of several avian and non-avian dinosaur samples revealed delicate fibres in secondary trabecular and secondary endosteal bone that in the former case (birds) is known or in the latter (non-avian dinosaurs) assumed to have been in contact with air sacs, respectively. The bone histology of this ‘pneumosteal tissue’ is markedly different from those regions where muscles attached presenting classical Sharpey's fibres. The pneumatized bones of several non-dinosaurian taxa do not exhibit the characteristics of this ‘pneumosteum’. Our new histology-based approach thus can be instrumental in reconstructing the origin of air sacs among dinosaurs and hence for our understanding of this remarkable evolutionary novelty of the respiratory system.
Original languageEnglish
Number of pages5
JournalBiology Letters
Volume14
Issue number1
Early online date03 Jan 2018
DOIs
Publication statusPublished - Jan 2018

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Air Sacs
air sacs
Dinosaurs
respiratory system
Respiratory System
bones
Bone and Bones
histology
Histology
Gigantism
Birds
fossils
Muscles
muscles
dinosaurs
birds

Keywords

  • bone histology
  • , respiratory biology
  • dinosaurs

Cite this

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title = "Bone histological correlates for air sacs and their implications for understanding the origin of the dinosaurian respiratory system",
abstract = "Air sacs are an important component of the avian respiratory system, and corresponding structures also were crucial for the evolution of sauropod dinosaur gigantism. Inferring the presence of air sacs in fossils so far is restricted to bones preserving internal pneumatic cavities and foramina as osteological correlates. We here present bone histological correlates for air sacs as a new potential identification tool for these elements of the respiratory system. The analysis of several avian and non-avian dinosaur samples revealed delicate fibres in secondary trabecular and secondary endosteal bone that in the former case (birds) is known or in the latter (non-avian dinosaurs) assumed to have been in contact with air sacs, respectively. The bone histology of this ‘pneumosteal tissue’ is markedly different from those regions where muscles attached presenting classical Sharpey's fibres. The pneumatized bones of several non-dinosaurian taxa do not exhibit the characteristics of this ‘pneumosteum’. Our new histology-based approach thus can be instrumental in reconstructing the origin of air sacs among dinosaurs and hence for our understanding of this remarkable evolutionary novelty of the respiratory system.",
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Bone histological correlates for air sacs and their implications for understanding the origin of the dinosaurian respiratory system. / Lambertz, Markus; Bertozzo, Filippo; Sander, P. Martin .

In: Biology Letters, Vol. 14, No. 1, 01.2018.

Research output: Contribution to journalArticle

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