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A REVISION OF THE GENERA MYCETOPORUS MANNERHEIM AND ISCHNOSOMA STEPHENS (COLEOPTERA: STAPHYLINIDAE: TACHYPORINAE) OF NORTH AND CENTRAL AMERICA

Published online by Cambridge University Press:  31 May 2012

J.M. Campbell
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Abstract

The North and Central American species formerly placed in the genus Mycetoporus are revised. Two genera are recognized, Mycetoporus Mannerheim and Ischnosoma Stephens, each with 18 species. The morphological and historical basis for this division is discussed. Ten species of Mycetoporus are described as new: bipunctatu, floridensis, impunctatus, neomexicanus, nidicola, pacificus, rufohumeralis, segregatus, smetanai, and triangulatus. Ten species of Ischnosoma are described as new: arizonense, ashei, costale, durangoense, fimbriatum, hermani, lecontei, mexicanum, pecki, and suteri. Mycetoporus boreelus J. Sahlberg, a species restricted to the Palearctic region, is removed from synonymy with M. nigrans Mäklin and Mycetoporus insignis Mäklin is found to be a junior synonym of M. americanus Erichson. Mycetoporus discalis, M. punctatissimus, and M. punctulatus, all species described by Hatch (1957), are transferred to the genus Bryoporus subgenus Bryophacis and the name Tachinus humidus Say is treated as a nomen dubium in the genus Mycetoporus.The usage of the generic names Mycetoporus Mannerheim and Ischnosoma Stephens is discussed. The North American species of the genus Mycetoporus are placed in six species groups and those of the genus Ischnosoma are placed in four species groups.A neotype is designated for Mycetoporus nigrans Mäklin and lectotypes are designated for M. americanus Erichson, M. insignis Mäklin, M. tenuis Horn, M. lucidulus LeConte, M. consors LeConte, Ischnosoma pictum (Horn) and I. flavicolle (LeConte). The following species were transferred from Mycetoporus to Ischnosoma and are new combinations: pictum Horn, splendidum Gravenhorst, flavicolle LeConte, virginiense Bernhauer, coxale Sharp, hospitale Fall, californicum Bernhauer and Schubert, and curtipenne Bernhauer.All genera, species groups, and species are described and the species are illustrated with line drawings and scanning electron photomicrographs. Keys are provided to distinguish the genera Mycetoporus and Ischnosoma and for all the species in each genus. The New World distribution of each species is mapped. The biology of each species, if known, is discussed.

Résumé

Ce travail comprend une révision des espèces d'Amérique du Nord et d'Amérique Centrale inclues auparavant dans le genre Mycetoporus. On distingue deux genres, Mycetoporus Mannerheim et Ischnosoma Stephens, chacun renfermant 18 espèces. L'auteur discute des données morphologiques et historiques supportant cette division. On décrit 10 espèces nouvelles dans le genre Mycetoporus, soit bipunctatus, floridensis, impunctatus, neomexicanus, nidicola, pacificus, rufohumeralis, segregatus, smetanai, et triangulatus, et 10 autres dans le genre Ischnosoma, soit arizonense, ashei, costale, durangoense, fimbriatum, hermani, mexicanum, pecki, lecontei, et suteri. Mycetoporus boreelus J. Sahlberg, une espèce paléarctique, n'est plus considérée comme un synonyme récent de M. nigrans, et Mycetoporus insignis Mäklin est placé en synonymie avec M. americanus Erichson. On transfert les espèces Mycetoporus discalis, M. punctatissimus, et M. punctulatus, toutes décrites par Hatch (1957), au sous-genre Bryophacis du genre Bryoporus et on traite le nom Tachinus humidus Say comme un nomen dubium dans le genre Mycetoporus.

L'auteur discute de l'usage des noms génériques Mycetoporus Mannerheim et Ischnosoma Stephens. On répartit les espèces nord-américaines du genre Mycetoporus en six groupes d'espèces et celles du genre Ischnosoma en quatre groupes d'espèces.

On désigne un néotype pour Mycetoporus nigrans Mäklin et des lectotypes pour M. americanus Erichson, M. insignis Mäklin, M. tenuis Horn, M. lucidulus LeConte, M. consors LeConte, Ischnosoma pictum (Horn) et I. flavicolle (LeConte). L'auteur transfert les espèces suivantes du genre Mycetoporus au genre Ischnosoma : pictum Horn, splendidum Grevenhorst, flavicolle LeConte, virginiense Bernhauer, coxale Sharp, hospitale Fall, californicum Bernhauer et Schubert, et curtipenne Bernhauer; ces noms constituent de nouvelles combinaisons.

Dans ce travail, les genres, groupes d'espèces et espèces sont décrits et les espèces illustrées au moyen de dessins et de photographies au microscope électronique à balayage. Il existe des tableaux pour différencier les genres Mycetoporus et Ischnosoma ainsi que les espèces de chaque genre. Enfin, la répartition géographique de chaque espèce est illustrée et la biologie des taxa, si connue, est discutée.

Type
Research Article
Information
The Memoirs of the Entomological Society of Canada , Volume 123 , Supplement S156 , 1991 , pp. 3 - 169
Copyright
Copyright © Entomological Society of Canada 1991

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