Zhang Fa, Boonmee Saranyaphat, Monkai Jutamart, Yang Xiao-Yan, Xiao Wen
Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand Center of Excellence in Fungal Research, Mae Fah Luang University Chiang Rai Thailand.
Institute of Eastern-Himalaya Biodiversity Research, Dali University, Dali, China Institute of Eastern-Himalaya Biodiversity Research, Dali University Dali China.
Biodivers Data J. 2022 Dec 16;10:e96642. doi: 10.3897/BDJ.10.e96642. eCollection 2022.
Nematode-trapping fungi are a highly specialised group in fungi and are essential regulators of natural nematode populations. At present, more than 130 species have been discovered in Zygomycota (Zoopagaceae), Basidiomycota (), and Ascomycota (Orbiliaceae). Amongst them, nematode-trapping fungi in Orbiliaceae have become the research focus of carnivorous fungi due to their abundant species. During the investigation of carnivorous fungi in Yunnan, China, four fungal strains isolated from burned forest soil were identified as two new nematode-trapping species in (Orbiliaceae), based on multigene phylogenetic analysis and morphological characters.
sp. nov. is characterised by its ellipsoid, 1-2-septate macroconidia, clavate or bottle-shaped, 0-1-septate microconidia and unbranched, simple conidiophores. sp. nov. is characterised by fusiform or spindle-shaped, 2-4-septate conidia and unbranched, simple conidiophores. Both of them produce constricting rings to capture nematodes. The phylogenetic analysis, based on combined ITS, TEF1-α and RPB2 sequences, determined their placement in . forms a basal lineage closely nested with (YMF1.03993). forms a sister lineage with (1.01429), a (YMF1.00119) and (FWY03-25-1).
捕线虫真菌是真菌中一个高度特化的类群，是天然线虫种群的重要调控者。目前，在接合菌门（虫霉科）、担子菌门（）和子囊菌门（圆盘菌科）中已发现130多个物种。其中，圆盘菌科的捕线虫真菌因其物种丰富而成为食虫真菌的研究热点。在中国云南食虫真菌的调查中，基于多基因系统发育分析和形态特征，从火烧后的森林土壤中分离出的4株真菌菌株被鉴定为圆盘菌科（）中的两个新的捕线虫物种。
新种的特征是其椭圆形、具1-2个隔膜的大分生孢子，棒状或瓶状、具0-1个隔膜的小分生孢子以及无分支的简单分生孢子梗。新种的特征是梭形或纺锤形、具2-4个隔膜的分生孢子以及无分支的简单分生孢子梗。它们都产生收缩环来捕获线虫。基于ITS、TEF1-α和RPB2序列组合的系统发育分析确定了它们在中的位置。形成一个基部谱系，紧密嵌套于（YMF1.03993）。与（1.01429）、（YMF1.00119）和（FWY03-25-1）形成姐妹谱系。
