二重奏希望,1838年(鞘翅目:Scarabaeidae:Scarabaeinae)是新世界生态系统中非常丰富和多样的粪甲虫属,大约有190个物种,分布在四个亚属中。Luederwaldt(SeparataRevMusPaul14:3-131929)提出了将亚属划分为主要基于外部形态特征的部分(现为物种组)。根据Luederwaldt的提议,近年来,该属的分类学修订取得了进展;然而,在作者提出的亚属划分和物种组中发现了不一致之处。根据15个昆虫学集合中沉积的所有类型材料和其他材料的外部形态和男性生殖器官,在本文中,重新定义和分类学修订了Dichotomius摩门教徒物种组。提出了该群体的新定义和物种键。该组包括5种:双歧杆菌(Blanchard,1846)(玻利维亚),拉森尼二重奏。11月。(玻利维亚),摩门教徒二重奏(Ljungh,1799年)(阿根廷,巴西,和巴拉圭),Dichotomiusohausi(Luederwaldt,1923年)(巴西,哥伦比亚,厄瓜多尔,和秘鲁),和二重奏talaus(埃里克森,1847)统计。rev.(玻利维亚,和秘鲁)。D.conicollis的样品,科普里斯·埃菲阿尔特斯·曼纳海姆,1829年,CoprisnasutaCastelnau,1840年,CoprisprotensusPerty,1830年D.Ohausi,和D.talaus被指定。对于该组中包含的每个物种,提供以下信息:分类历史,已发表文献中的物种引文,对男性和女性的描述或重新描述,检查的材料清单,外部形态的照片,男性生殖器官的插图和它的内膜,和分布图。
Dichotomius Hope, 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 mormon species 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 larseni sp. 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 ephialtes Mannerheim, 1829, Copris nasuta Castelnau, 1840, Copris protensus Perty, 1830, D. ohausi, and D. talaus were 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.