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Avian air sacs and neopulmo: their evolution, form and function.

Wilfried Klein1, Vinícius Pereira Ribeiro1, Ray Brasil Bueno de Souza2

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|February 26, 2025
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Summary

This study reviews avian respiratory system structures, focusing on air sacs and the neopulmo, which are less studied than parabronchi. It compiles existing data to analyze their morphology and function in birds.

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airflowgas exchangepulmonary ventilationsystematics

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Area of Science:

  • Comparative anatomy
  • Avian physiology
  • Respiratory system biology

Background:

  • The avian respiratory system comprises parabronchi for gas exchange and air sacs acting as a pump.
  • Palaeopulmonic parabronchi are well-studied, but air sacs and the neopulmo receive less comparative and functional examination.
  • Morphological data for avian air sacs and neopulmo exist for some families and domestic species, but many bird orders remain under-investigated.

Purpose of the Study:

  • To compile and analyze existing data on air sac and neopulmo morphology across diverse avian taxa.
  • To examine the functional and phylogenetic aspects of these understudied respiratory structures.
  • To provide a comprehensive overview of avian air sac and neopulmo biology within current phylogenetic contexts.

Main Methods:

  • Compilation of existing literature and data on avian air sac and neopulmo morphology.
  • Analysis of compiled data in the context of current avian phylogenetic relationships.
  • Discussion of the functional implications of air sac and neopulmo morphology for avian physiology.

Main Results:

  • Significant gaps in detailed morphological and functional data exist for air sacs and neopulmo in numerous avian orders.
  • The study highlights the need for further research into these structures across a broader range of bird species.
  • Analysis reveals insights into the functional roles and evolutionary relationships of these respiratory components.

Conclusions:

  • Air sacs and the neopulmo are crucial but under-examined components of the avian respiratory system.
  • Further comparative research is essential to fully understand the diversity and function of these structures across all avian lineages.
  • This review consolidates current knowledge and identifies key areas for future investigation in avian respiratory biology.