| Abstrakt: |
DichotomiusHope, 1838 (Coleoptera: Scarabaeidae: Scarabaeinae) is a very abundant and diverse genus of dung beetles of the New World ecosystems, with about 190 species, distributed in four subgenera. Luederwaldt (Separata Rev Mus Paul 14: 3–13 1929) proposed the division of subgenera into sections (now species groups) based mainly on characters of external morphology. Based on Luederwaldt’s proposal, progress has been made in recent years in the taxonomic revision of the genus; however, inconsistencies have been found in the subgeneric division and species groups proposed by this author. Based on the external morphology and the male genital organ of the all type material and other material deposited in fifteen entomological collections, in this paper, the redefinition and taxonomic revision of the Dichotomius mormonspecies group is carried out. The new definition of the group and the species key are presented. Five species are included in the group: Dichotomius conicollis(Blanchard, 1846) (Bolivia), Dichotomius larsenisp. nov. (Bolivia), Dichotomius mormon(Ljungh, 1799) (Argentina, Brazil, and Paraguay), Dichotomius ohausi(Luederwaldt, 1923) (Brazil, Colombia, Ecuador, and Peru), and Dichotomius talaus(Erichson, 1847) stat. rev. (Bolivia, and Peru). The lectotypes for D. conicollis, Copris ephialtesMannerheim, 1829, Copris nasutaCastelnau, 1840, Copris protensusPerty, 1830, D. ohausi, and D. talauswere designated. For each of the species that are included in the group, the following information is presented: taxonomic history, species’ citation in published literature, description or redescription of males and females, list of material examined, photographs of the external morphology, illustrations of male genital organ and its endophallites, and distribution map. |
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