First record of extra-abdominal processes in adult Odonata
International Journal of Odonatology, Volume 19, Issue 1-2, Pages 53-61, 2016
Published: 2 April 2016 (Received: 9 October 2015, Accepted: 22 March 2016)
Paired extra-abdominal processes (ap) were found in the pleural region of abdominal segments 6–9 in adult Odonata for the first time. They are unsegmented bulge-like or rod-like structures of different size, degree of sclerotization and movability. A short search across odonatan families has shown that ap are inherent for all studied Aeshnidae and for some other Anisoptera. A comparative study of final stadium larvae has shown that ap appear as remnants of larval lateral spines originally situated on larval tergites. This fact provides evidence about the complex nature of the pleural region in the Aeshnidae imago which includes part of the area of the larval tergite.
Issue section: Review