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Revision of Nearctic species of Cerodontha (Cerodontha) (Diptera: Agromyzidae)

Published online by Cambridge University Press:  31 May 2012

Stéphanie Boucher
Stéphanie Boucher*
Affiliation:
Department of Natural Resource Sciences, McGill University, Macdonald Campus, Ste-Anne-de-Bellevue, Quebec, Canada H9X 3V9
*
1 E-mail: sboucher@nrs.mcgill.ca).
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Abstract

The Nearctic fauna of the subgenus Cerodontha (Cerodontha) Rondani is revised and contains 10 species: C. aduncasp.nov. (Mexico), C. dorsalis (Loew) (widespread Nearctic, eastern Palaearctic, Neotropical), C. gracilis Spencer (western Nearctic), C. inflatasp.nov. (Mexico), C. occidentalis Sehgal (northwestern Nearctic), C. occidoparvasp.nov. (western Nearctic), C. tolucasp.nov. (Mexico), C. trispinata Spencer (Mexico), C. trispinella Spencer (Mexico), and C. trispinosa Spencer (Mexico). All Nearctic species are described and illustrated and a key to species is provided. There are two colour forms of the widespread Nearctic species C. dorsalis: a pale eastern form and a dark western form, although there is overlap in the geographic distribution of the two forms and intermediates exist. The six Mexican species are known from a total of only nine specimens, suggesting that the diversity of this subgenus in Mexico and Central America may be higher than currently known.

Résumé

La faune néarctique du sous-genre Cerodontha (Cerodontha) Rondani est révisée et contient 10 espèces : C. aduncasp.nov. (Mexique), C. dorsalis (Loew) (répandue dans la zone néarctique, palaéarctic est, néotropicale), C. gracilis Spencer (ouest néarctique), C. inflatasp.nov. (Mexique), C. occidentalis Sehgal (nord-ouest néarctique), C. occidoparvasp.nov. (ouest néarctique), C. tolucasp.nov. (Mexique), C. trispinata Spencer (Mexique), C. trispinella Spencer (Mexique) et C. trispinosa Spencer (Mexique). Toutes les espèces de la région néarctique sont décrites et illustrées, et une clé d'identification des espèces est donnée. Cerodontha dorsalis, l'espèce très répandue dans la zone néarctique, existe sous deux formes : une forme pâle de l'est et une forme foncée de l'ouest, mais il peut y avoir un chevauchement dans la distribution des deux formes, de plus, une forme intermédiaire existe. Jusqu'à maintenant, sur un total de seulement neuf spécimens, six espèces Mexicaines sont connues, ce qui porte à croire que la diversité de ce sous-genre au Mexique et en Amérique centrale est probablement plus élevée.

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 5 , October 2002 , pp. 577 - 603
Copyright
Copyright © Entomological Society of Canada 2002

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