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Larval respiratory systems of two anthomyiid flies, Delia radicum and Delia antiqua (Diptera: Anthomyiidae)1

Published online by Cambridge University Press:  02 April 2012

D.G. Biron ,
D. Coderre ,
S. Fournet ,
J.P. Nénon ,
J. Le Lannic  and
G. Boivin
D.G. Biron*
Affiliation:
Département des Sciences Biologiques, Université du Québec à Montréal, Case postale 8888, succursale Centre Ville Montréal, Québec, Canada H3C 3P8
D. Coderre
Affiliation:
Département des Sciences Biologiques, Université du Québec à Montréal, Case postale 8888, succursale Centre Ville Montréal, Québec, Canada H3C 3P8
S. Fournet
Affiliation:
SILEBAN, Gatteville-Phare, France
J.P. Nénon
Affiliation:
Laboratoire d'écobiologie des insectes parasitoïdes, Université de Rennes I, Campus de Beaulieu, avenue du général Leclerc, 35 042 Rennes CEDEX, France
J. Le Lannic
Affiliation:
Laboratoire d'écobiologie des insectes parasitoïdes, Université de Rennes I, Campus de Beaulieu, avenue du général Leclerc, 35 042 Rennes CEDEX, France
G. Boivin
Affiliation:
Horticultural Research and Development Centre, Agriculture and Agri-Food Canada, 430 boulevard Gouin, Saint-Jean-sur-Richelieu, Quebec, Canada J3B 3E6
*
3Corresponding author (e-mail: [email protected]).
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Abstract

The first-instar larvae of Delia radicum (L.) and Delia antiqua (Meigen) enter host plants to feed in galleries. These galleries can be filled by a liquid resulting from the putrefaction of the host. In this study, we show that D. radicum and D. antiqua larvae have a metapneustic respiratory system in the first instar and an amphipneustic respiratory system in the second instar, as observed in the majority of cyclorrhaphous Diptera. In addition, we observed four spatulate, ramified structures on the postabdominal spiracles in all three larval instars. We propose that these structures facilitate gas exchange (CO2 and O2), especially in the first-instar larvae when they feed in liquid-filled galleries.

Résumé

Les larves de premier stade de Delia radicum (L.) et de Delia antiqua (Meigen) s'insèrent dans les plantes hôtes et y creusent des galeries pour se nourrir. La putréfaction de l'hôte peut remplir ces galeries de liquide. Notre étude montre que les larves de D. radicum et de D. antiqua possèdent au premier stade un système respiratoire métapneustique et au second stade un système respiratoire amphipneustique, comme c'est le cas chez la plupart des diptères cyclor rhaphes. De plus, il existe quatre structures ramifiées en forme de spatules sur les stigmates abdominaux postérieurs chez les larves des trois stades. Nous croyons que ces structures facilitent les échanges gazeux (CO2 et O2), particulièrement au premier stade, lorsque les larves s'alimentent dans des galeries remplies de liquide.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 137 , Issue 2 , April 2005 , pp. 163 - 168
Copyright
Copyright © Entomological Society of Canada 2005

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Footnotes

1

Contribution 335/2005.03.01R of the Horticultural Research and Development Centre, Agriculture and Agri-Food Canada, Saint-Jean-sur-Richelieu.

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