The genus Merodon Meigen, 1803 is distributed across the Palaearctic and Afrotropical Regions. The present work summarizes the knowledge from recent taxonomic and systematic revisions and includes an identification key for the five monophyletic lineages (namely albifrons, aureus, avidus-nigritarsis, desuturinus and natans), 24 species groups, two species subgroups and 10 unplaced species, along with diagnosis and illustrations. A list of 234 taxa, including 194 described and 40 undescribed species, is appended. Most of the species are distributed in the Palaearctic (209 taxa, 181 described), while 27 species (14 described) are known from the Afrotropical Region. Three lineages (aureus, desuturinus and natans) are present in the Afrotropical Region, as well as in the Palaearctic. The Afrotropical melanocerus species group of the desuturinus lineage and the bombiformis species group of the aureus lineage are endemic to the Afrotropical Region, and all other species groups belong to the Palaearctic fauna. The albifrons lineage contains six species groups (albifrons, constans, equestris, geniculatus, ruficornis and rufus) and two unplaced taxa. The aureus lineage includes five species groups (aureus, bombiformis, funestus, nanus and spinitarsis). The avidus-nigritarsis lineage is divided into 10 species groups (aberrans, aurifer, avidus, clavipes, fulcratus, italicus, nigritarsis, pruni, serrulatus and tarsatus) and eight unplaced taxa. The desuturinus lineage contains two species groups: the Afrotropical melanocerus group, with the melanocerus and planifacies subgroups plus the species M. cuthbertsoni Curran, 1939, and the Palaearctic murorum species group. The natans lineage consists of the natans species group plus the species M. segetum Fabricius, 1794.

中文翻译：

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Merodon Meigen属的分类学复杂性，1803年（双翅目，Syrphidae）

Merodon Meigen属1803年分布在古北非地区。本工作总结了最近的分类学和系统修订的知识，并包括五个单系谱系（即白化病，金黄色葡萄球菌，抗鸟粪病，地龙和纳坦），24个物种组，两个物种亚组和10个未放置物种的识别码。诊断和插图。附有234个分类单元的清单，包括194个已描述物种和40个未描述物种。大多数物种分布在古太平洋（209个分类群，描述为181个），而从非洲地区已知27个物种（描述为14个）。在非洲地区和古北美洲，存在着三种谱系（金黄色葡萄球菌，金鱼藻和扁豆）。Desuturinus谱系的非洲嗜黑变种种群和金黄色葡萄球谱系的bombiformis种群是非洲地区特有的，所有其他物种群都属于古北动物群。albifrons世系包含六个物种组（albifron，constans，equestris，geniculatus，ruficornis和rufus）和两个未放置的分类单元。金黄色葡萄球菌谱系包括五个种类组（金黄色葡萄球菌，庞氏菌，真菌，七叶虫和刺棘鱼）。Avidus-nigritarsis世系分为10个物种组（Aberrans，aurifer，Avidus，锁骨，fulcratus，Italicus，Nigritarsis，pruni，serrulatus和tarsatus）和八个未放置的分类群。Desuturinus世系包含两个物种组：嗜黑性黑素瘤组，包括黑色素和浮萍亚组，以及M. cuthbertsoni Curran，1939年，和古北极物种组。natans谱系由natans物种组加上物种M.segetum Fabricius（1794年）组成。