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PHYLOGENY AND BIOGEOGRAPHY OF EUSTILICUS SHARP (COLEOPTERA: STAPHYLINIDAE: PAEDERINAE): RE-EVALUATION BASED UPON A NEW AND RELICT SPECIES FROM THE EDWARDS PLATEAU OF TEXAS

Published online by Cambridge University Press:  31 May 2012

Henry E. Frania
Henry E. Frania
Affiliation:
Department of Entomology, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, Canada M5S 2C6
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Abstract

Adults and larvae of Eustilicus relictus sp.nov. are described from the Edwards Plateau of Texas. The species is brachypterous and lives in deep leaf litter. Morphological characters of both stages indicate that E. relictus belongs in its own group and has a near-basal phylogenetic position in the genus. I infer that the group to which E. relictus belongs was in the United States before formation of the dry belt which currently separates mesic areas of the United States and Mexico. All other species of Eustilicus in the United States belong to younger groups that spread north from Mexico much later.

Résumé

On trouvera ici la description des larves et des adultes d’Eustilicus relictus sp.nov. du plateau Edwards au Texas. Il s’agit d’une espèce brachyptère qui habite dans les litières épaisses de feuilles. Les caractéristiques morphologiques des larves et des adultes indiquent qu’E. relictus appartient à son propre groupe et se situe presque à la base de l’arbre phylogénique du genre. Je conclus que le groupe auquel appartient E. relictus habitait les États-Unis avant la formation de la bande xérique qui sépare maintenant les régions humides des États-Unis et du Mexique. Toutes les autres espèces d’Eustilicus des États-Unis appartiennent à des groupes plus récents qui se sont répandus depuis le Mexique vers le nord beaucoup plus tard.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 3 , June 1994 , pp. 493 - 501
Copyright
Copyright © Entomological Society of Canada 1994

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References

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