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REVISION OF THE NEARCTIC SPECIES OF LAUXANIA (DIPTERA: LAUXANIIDAE)

Published online by Cambridge University Press:  31 May 2012

Joëlle R. Pérusse  and
Terry A. Wheeler
Joëlle R. Pérusse
Affiliation:
Department of Natural Resource Sciences, McGill University, Macdonald Campus, Ste-Anne-de-Bellevue, Quebec, Canada H9X 3V9
Terry A. Wheeler*
Affiliation:
Department of Natural Resource Sciences, McGill University, Macdonald Campus, Ste-Anne-de-Bellevue, Quebec, Canada H9X 3V9
*
1 Author to whom all correspondence should be addressed (E-mail: wheeler@nrs.mcgill.ca).
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Abstract

The North American species of Lauxania Latreille are revised. The genus contains five Nearctic species: L. albiseta Coquillett, L. glabrifronssp.nov., L. kafaristasp.nov., L. nigrimana Coquillett, and L. shewellisp.nov. All Nearctic species are illustrated and keyed. Consistent genitalic differences between Nearctic and Palaearctic specimens of the species usually identified as Lauxania cylindricornis (Fabricius) justify the recognition of the Nearctic specimens as a distinct species (L. shewelli). The male genitalia of Lauxania represent two types: the apparently plesiomorphic type has a simple rodlike phallapodeme, membranous phallus, and pointed unbranched postgonites; the apomorphic type has the phallapodeme expanded into a sclerotized hood surrounding the base of the phallus, a convoluted sclerotized phallus, and branched postgonites. These two genitalic types also occur in the related genus Calliopum Strand, which provides strong evidence that these genera, as currently recognized, may not be monophyletic relative to one another.

Résumé

Les espèces nord américaines du genre Lauxania Latreille sont révisées. Ce genre regroupe cinq espèces néarctiques : L. albiseta Coquillet, L. glabrifronssp.nov., L. kafaristasp.nov., L. nigrimana Coquillet and L. shewellisp.nov. Cellesci sont illustrées et une clé est incluse. Des différences génitaliques constantes entre les spécimens néarctiques et paléarctiques chez l’espèce généralement identifiée comme Lauxania cylindricornis (Fabricius) justifient la reconnaissance des spécimens néarctiques comme espèce distincte (L. shewelli). Chez les mâles, il existe deux types distincts d’organes génitaux : le premier apparemment plésiomorphique où le phallapodème est cylindrique, le phallus, membraneux et les postgonites, pointus et sans ramification. Chez le second type, présumément apomorphique, le phallapodeme est sclérotizé et entoure la base du phallus, le phallus est sclerotizé et convoluté, et les postgonites, ramifiés. Ces deux mêmes types génitaliques se retrouvent aussi chez le genre Calliopum Strand, ce qui indiquerait que Lauxania et Calliopum, tels que présentement définis, peuvent ne pas être monophylétiques.

Type
Articles
Information
The Canadian Entomologist , Volume 132 , Issue 4 , August 2000 , pp. 411 - 427
Copyright
Copyright © Entomological Society of Canada 2000

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