Caudalmost thoracic vertebrae of anseriform birds in right lateral view. A, Chauna torquata (Anhimidae; SMF 11885). B, Anseranas semipalmata (Anseranatidae; SMF 19902). C, A. semipalmata (SMF 11276). D, Aythya australis (Anatidae; SMF 17945). E, Callonetta leucophrys (Anatidae; SMF 18330). F, juvenile Merganetta armata (Anatidae; SMF 14859). G, Dendrocygna viduata (Anatidae; SMF 2418). Abbreviations: lop, lateral openings; plc, pleurocoel. The scale bars equal 10 mm.

 
 
  Part of: Mayr G (2021) On the occurrence of lateral openings and fossae (pleurocoels) in the thoracic vertebrae of neornithine birds and their functional significance. Vertebrate Zoology 71: 453-463. https://doi.org/10.3897/vz.71.e71268