Azygosporus B. Huang & Y. Nie, 2021

Cai 1, Yue, Nie *, Yong, Zhao, Heng, Wang, ZiMin, Zhou, ZhengYu, Liu, XiaoYong & Huang, Bo, 2021, Azygosporus gen. nov., a synapmorphic clade in the family Ancylistaceae, MycoKeys 85, pp. 161-172 : 161

Azygosporus B. Huang & Y. Nie gen. nov.

Etymology.

Referring to produce azygospores.

Type species.

Azygosporus parvus (Drechsler) B. Huang & Y. Nie.

Description.

Mycelia colorless. Primary conidiophores simple, bearing single primary conidia. Primary conidia forcibly discharged multinucleate, colourless, globose to subglobose, small, less than 22.5 μm. Producing only globose or subglobose replicative conidia, similar to and smaller than primary conidia. Azygospores formed in the middle region of the old hyphal segments. Mature azygospores colourless or yellowish, smooth, without thickening or less thickening (0.5-1.2 μm).

Notes.

Azygosporus is strongly supported as monophyletic and is distinguished from other Ancylistaceae lineages by the synapomorphy of azygospore production. Therefore, we classify this lineage as a new genus, named Azygosporus gen. nov. Azygosporus currently contains only two members: C. parvus (= A. parvus ) and A. macropapillatus sp. nov. (Fig. 1 ). Morphologically, Azygosporus is most similar to Microconidiobolus , which forms small primary conidia (less than 22.5 μm) (Table 2 ). However, the synapomorphy of azygospore production clearly distinguishes Azygosporus from Microconidiobolus and other allied genera of the family.

Figures

Figure 1. ML tree of Coniobolus s. l. using nrLSU + TEF 1 + mtSSU sequences. Entomophthora muscae and Erynia conica are selected as outgroups. Support for each node is shown as MP bootstrap support / ML bootstrap support / Bayesian posterior probability (MPBS / MLBS / BPP) for nodes with MPBS ≧ 70 %, MLBS ≧ 70 %) and BPP ≧ 0.95. The new genus, Azyosporus, and new species, A. macropapillatus, are shown in red, and the new combination is shown in blue.