Table of Contents
ISRN Zoology
Volume 2011, Article ID 170829, 3 pages
Research Article

The Spiral Organ Responsible for Producing Sound Signals, an Essential Taxonomic Character in the Phylogenetic Analysis of the Genus Hamadryas (Nymphalidae: Biblidinae): The Case of Hamadryas chloe chloe (Stoll) [1787] from South America

Sistema de Estudios de Posgrado en Biología, Escuela de Biología, Universidad de Costa Rica, 2060 San José, Costa Rica

Received 24 January 2011; Accepted 6 March 2011

Academic Editor: E.-I. Izawa

Copyright © 2011 Luis Ricardo Murillo-Hiller. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Dissections and scientific illustrations were done of the spiral organ located in the forewing subcostal vein of H. chloe, which was compared with other Hamadryas species that produce audible sound signals. Important differences were found; for example, in H. chloe, this organ is split into many independent pieces called membrane discs, whereas in the others species, it consists of just a single spiral. Implications for systematic analysis are discussed, with support from observations on ecology, chorology, and male genitalia.