Morphological analysis of air sacs in red-winged tinamou (Rhynchotus rufescens Temminck, 1815)

Katia Aparecida da Silva Viegas; Karina Padula; Eduardo Henrique Martins; Luiz Eduardo Cruz dos Santos Correia; Josineudson Augusto II de Vasconcelos Silva; André Luis Filadelpho

doi:10.1590/1809-6891v25e-79886E

Authors

Katia Aparecida da Silva Viegas Universidade Estadual Paulista "Júlio de Mesquita Filho" (Unesp), Campus Botucatu, São Paulo, Brasil https://orcid.org/0000-0003-3077-478X
Karina Padula Universidade Estadual Paulista "Júlio de Mesquita Filho" (Unesp), Campus Botucatu, São Paulo, Brasil https://orcid.org/0000-0001-6244-7412
Eduardo Henrique Martins Universidade Estadual Paulista "Júlio de Mesquita Filho" (Unesp), Campus Botucatu, São Paulo, Brasil https://orcid.org/0000-0003-1137-7367
Luiz Eduardo Cruz dos Santos Correia Universidade Estadual Paulista "Júlio de Mesquita Filho" (Unesp), Campus Botucatu, São Paulo, Brasil https://orcid.org/0000-0002-2925-1116
Josineudson Augusto II de Vasconcelos Silva Universidade Estadual Paulista "Júlio de Mesquita Filho" (Unesp), Campus Botucatu, São Paulo, Brasil https://orcid.org/0000-0002-0049-1546
André Luis Filadelpho Universidade Estadual Paulista "Júlio de Mesquita Filho" (Unesp), Campus Botucatu, São Paulo, Brasil https://orcid.org/0000-0002-3749-7853

DOI:

https://doi.org/10.1590/1809-6891v25e-79886E

Abstract

Anatomical descriptions of partridges’ air sacs of the species Rhynchotus rufescens are scarce.
This study aimed to evaluate the air sacs of this species. Ten cadaveric specimens of adult partridges,
approximately 1 year old, were collected, and latex perfusion was used to solidify the material. The
cervical air sac of a red-winged tinamou is smaller and has a more irregular conformation than other air
sacs. The thoracic air sacs are symmetrical, and the cranial thoracic air sacs are smaller than the caudal
ones. The abdominal air sacs are asymmetrical, and the largest ones extend themselves to the cloaca.
Only one clavicular air sac was found, with three subdivisions: right, left, and medial. Additionally, right
and left extrathoracic portions were found, passing under the clavicle. In one of the animals, the latexfilled
humeri were found, and in three other ribs, vertebral diverticula were present. There is no clear
relationship between taxonomy and biology versus the quantity and conformation of air sacs, because
different animals with taxonomic proximity present differences. This study enhances species-specific
anatomical knowledge of this species of partridge.

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