A revision of the southern South American genus Bolborhinum Boucomont (Coleoptera: Geotrupidae: Bolboceratinae)

Abstract

The genus Bolborhinum Boucomont (Coleoptera: Geotrupidae: Bolboceratinae: Bolboceratini) is revised and now contains eight species: B. geotrupoides (Laporte), B. laesicolle (Fairmaire), B. nasutum (Fairmaire and Germain), B. seai (Martínez), B. shajovskoyi (Martínez), B. tricorne (Solier), B. trilobulicorne new species, and B. tubericeps (Fairmaire). The genus Bolborhinum is redescribed and a key to species in English and Spanish, a checklist, distributional and temporal data, and designation of lectotypes and neotypes are given. All species in the genus are diagnosed and illustrated, and distributional records with maps for all species are included. Additionally, some observations on the natural history of Bolborhinum species are presented. One new synonym is proposed: Bolboceras binasutum Fairmaire and Germain is synonymized under Bolborhinum geotrupoides. Lectotypes are designated for the following species-group names: Bolboceras binasutum Fairmaire and Germain (a junior synonym of Bolborhinum geotrupoides), Bolboceras distinguendum Fairmaire and Germain (a junior synonym of Bolborhinum geotrupoides), Bolboceras laesicolle Fairmaire (now Bolborhinum laesicolle), Bolboceras nasutum Fairmaire and Germain (now Bolborhinum nasutum), Bolboceras tetraodon Redtenbacher (a junior synonym of Bolborhinum tubericeps), Bolboceras tricorne Solier (now Bolborhinum tricorne), and Bolboceras tubericeps Fairmaire (now Bolborhinum tubericeps). Neotypes are designated for the following species-group names: Bolboceras andicola Philippi (a junior synonym of Bolhorhinum nasutum), Bolboceras bicorne Philippi (a junior synonym of Bolborhinum tubericeps), Bolboceras excavatum Philippi (a junior synonym of Bolborhinum laesicolle), and Bolboceras geotrupoides Laporte (now Bolborhinum geotrupoides). Additionally, we here elevate the subgenera Pereirabolbus Martínez and Zefevazia Martínez to the generic level based on morphological comparisons with the genus Bolborhinum. As a result, the following combinations reflect this change in status: Pereirabolbus castaneus (Klug), Pereirabolbus tucumanensis (Boucomont), Zefevazia cantisanii (Martínez), Zefevazia peruana (Boucomont), Zefevazia quinquedentata (Felsche), and Zefevazia rosascostai Martínez. These changes are congruent with the generic concepts of Bolboceratinae from other parts of the world, and with the modern classification of the group. Copyright © 2008 Magnolia Press.