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APHODIINAE (COLEOPTERA: SCARABAEIDAE) OF THE GALÁPAGOS ISLANDS

Published online by Cambridge University Press:  31 May 2012

Joyce Cook  and
Stewart B. Peck
Joyce Cook*
Affiliation:
Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada K1S 5B6
Stewart B. Peck
Affiliation:
Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada K1S 5B6
*
1 Author to whom all corresponding should be addressed.
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Abstract

The Aphodiine fauna of the Galápagos Islands, Ecuador, is reviewed. Ten species in two genera are now recorded for the archipelago. Two species, Ataenius cristobalensissp.nov. and Ataenius floreanaesp.nov., are described. Ataenius leleupi Petrovitz is placed in synonymy. Two previously described species, Ataenius gracilis (Melsheimer) and Ataenius liogaster Bates, are newly recorded as recent introductions to the islands. A key to species is included. We hypothesize that wing dimorphism for the species of the genus Ataenius Harold endemic to the Galápagos underwent the following evolutionary stages: (1) colonization, (2) adaptation to high-elevation moist forest, and (3) speciation and extinction.

Résumé

On trouvera ici une révision de la faune des Aphodiinés des îles Galápagos, Équateur. On compte maintenant 10 espèces appartenant à deux genres dans l’archipel. Deux espèces, Ataenius cristobalensissp.nov. et A. floreanaesp.nov. sont décrites ici. Ataenius leleupi Petrovitz est mis en synonymie. Deux espèces déjà décrites, Ataenius gracilis (Melsheimer) et Ataenius liogaster Bates sont reconnues comme des introductions récentes dans l’archipel. La clé d’identification présentée ici permettra de distinguer les espèces. Nous croyons que le dimorphisme des ailes chez les espèces endémiques du genre Ataenius Harold dans les îles ont subi les stades évolutifs suivants : (1) la colonisation, (2) l’adaptation à la forêt humide en haute altitude, (3) la spéciation et l’extinction.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 132 , Issue 3 , June 2000 , pp. 281 - 300
Copyright
Copyright © Entomological Society of Canada 2000

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