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Psyche
Volume 2009 (2009), Article ID 675242, 7 pages
http://dx.doi.org/10.1155/2009/675242
Research Article

Comparative Study of the Morphology of the Ovipositor of Platygaster diplosisae (Hymenoptera: Platygasteridae) and Aprostocetus procerae (Hymenoptera: Eulophidae) Two Parasitoids Associated with the African Rice Gall Midge, Orseolia oryzivora (Diptera: Cecidomyiidae)

1Institut de l'Environnement et de Recherches Agricoles (INERA), Station de Farako-Bâ 01, BP 910, Bobo-Dioulasso 01, Burkina Faso
2FAO 12, BP 210, Ouagadougou 12, Burkina Faso
3Equipe d'Ecobiologie des Insectes Parasitoïdes, Campus de Beaulieu, Faculté des Sciences, Université de Rennes I, Avenue du Général Leclerc, F-34042 Rennes Cedex , France

Received 23 October 2008; Revised 9 January 2009; Accepted 23 March 2009

Academic Editor: Bethia King

Copyright © 2009 Souleymane Nacro and Jean-Pierre Nénon. 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.

Abstract

We studied the morphology of the ovipositor of Platygaster diplosisae (Hymenoptera: Platygasteridae) and Aprostocetus procerae (= Tetrastichus pachydiplosisae) (Hymenoptera: Eulophidae), two parasitoids associated with the African rice gall midge (AFRGM), and Orseolia oryzivora (Diptera: Cecidomyiidae). Scanning electron microscope techniques were used for this study. The ovipositor of P. diplosisae was short (40  m), and most of the sensillae found on it were mechanoreceptors and located on the distal portion of the 3rd valvulae. These sensillae may be involved in selection of an egg or larval host. The shortness of this ovipositor may be an adaptation to a host whose egg envelope thickness is not more than 0.7  m. The ovipositor of A. procerae was 30 times (1.2 mm) the length of the P. diplosisae ovipositor. It was not only well equipped with mechanoreceptive sensillae, but these sensillae were very diverse and distributed along the length of the valvulae. The 10 denticulations of the lancet of this ovipositor allow this parasitoid to exploit hosts that are not otherwise readily accesible. These two parasitoids share the same resource by infesting different life stages of the host. The ovipositor of each species of parasitoid enhanced resource sharing, due to its length and its sensillae type and distribution.