A taxonomic revision of the genus Conidiobolus (Ancylistaceae, Entomophthorales): four clades including three new genera Author Nie, Yong Anhui Provincial Key Laboratory for Microbial Pest Control, Anhui Agricultural University, Hefei 230036, China & School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan 243002, China Author Yu, De-Shui Anhui Provincial Key Laboratory for Microbial Pest Control, Anhui Agricultural University, Hefei 230036, China Author Wang, Cheng-Fang Anhui Provincial Key Laboratory for Microbial Pest Control, Anhui Agricultural University, Hefei 230036, China Author Liu, Xiao-Yong State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China Author Huang, Bo Anhui Provincial Key Laboratory for Microbial Pest Control, Anhui Agricultural University, Hefei 230036, China text MycoKeys 2020 66 55 81 http://dx.doi.org/10.3897/mycokeys.66.46575 journal article bhuang@ahau.edu.cn http://dx.doi.org/10.3897/mycokeys.66.46575 1314-4049-66-55 A633A7E04ED752E9A6123DA654ED24D7 Microconidiobolus B. Huang & Y. Nie gen. nov. Etymology. Referring to small discharged primary conidia. Type species. Microconidiobolus paulus (Drechsler) B. Huang & Y. Nie. Description. Mycelia colourless. Primary conidiophores simple and short, bearing a single primary conidia. Primary conidia forcibly discharged, multinucleate, colourless, globose to obovoid, usually small, mostly less than 20 μm . Only globose replicative conidia produced, similar and smaller than primary conidia. Chlamydospores globose, formed terminally on hyphae or from globose cells by thickening of the wall. Zygospores formed in axial alignment with two conjugating segments, globose to ellipsoidal, smooth and yellowish. Notes. This genus includes three species producing smaller primary conidia (mostly less than 20 μm ) without microspores or capilliconidia compared to other Conidiobolus spp. These three species are C. nodosus , C. paulus and C. terrestris . According to the taxonomic scheme of Conidiobolus by King (1977) , C. undulatus is a synonym of C. paulus , which is supported herein by molecular evidence (Figure 1 ). However, the phylogeny does not support C. nodosus and C. terrestris as synonyms of C. lachnodes , since the former two were located in clade IV and the latter in clade II (Figure 1 ). Therefore, we accept the taxonomic status at species level for C. nodosus and C. terrestris , based on the morphological and phylogenetic analyses.