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VICARIANCE EVENTS IN THE BIOGEOGRAPHICAL HISTORY OF PANSCOPUS SCHÖNHERR WEEVILS IN NORTH AMERICA (COLEOPTERA: CURCULIONIDAE: ENTIMINAE)

Published online by Cambridge University Press:  31 May 2012

T.G. Spanton
T.G. Spanton
Affiliation:
Department of Entomology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3
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Abstract

A phylogenetic hypothesis of relationships among the species of the broad-nosed weevil genus Panscopus Schönherr indicates sister-taxon relationships between pairs of species, and pairs of ancestral lineages, which today exhibit disjunctions between their geographical distributions. The range disjunctions in these sister lineages appear to correlate with known geological or palaeoecological events. These correlates suggest dates of later Eocene to Miocene for some branching points in the phylogeny. These observations are consistent with the hypothesis that one or more ancestral form(s) of Panscopus were extant by the Eocene or earlier, and that most of the cladogenesis in the history of this genus occurred likely in middle to late Tertiary times. These hypotheses, in turn, suggest that adelognathan weevils must be a much older group than the oldest known representative fossils would suggest (Eocene), and that they likely arose during the Mesozoic.

Résumé

Une hypothèse phylogénétique sur les relations entre les espèces de charançons du genre Panscopus Schönherr indique l’existence de liens de parenté entre des paires d’espèces et des paires de lignées ancestrales qui ont aujourd’hui des répartitions géographiques bien séparées. L’éloignement entre ces lignées soeurs semble en corrélation avec des événements géologiques ou paléoécologiques connus. Ces relations indiquent que certains embranchements dans l’arbre phylogénique se seraient produits entre la fin de l’Éocène et la Miocène. Ces observations supportent l’hypothèse selon laquelle une ou plusieurs formes ancestrales de Panscopus étaient déjà présentes à l’Éocène ou même avant, et selon laquelle la cladogénènse au cours de l’histoire du genre s’est produite probablement entre le milieu et la fin du Tertiaire. Ces hypothèses indiquent à leur tour que les charançons adélognathes sont probablement un groupe plus ancien que ne le permettent de croire les fossiles représentatifs les plus vieux que nous connaissions (Éocène) et que le groupe existe probablement depuis le Mésozoïque.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 3 , June 1994 , pp. 457 - 470
Copyright
Copyright © Entomological Society of Canada 1994

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