贵州喀斯特森林中鳞翅虫草属一新种:长链鳞翅虫草OA

Samsoniella is an important genus recently segregated from the Isaria-like complex,characterized by high species diversity,a wide range of hosts,and broad ecological distribution.During field investigations in the karst region of Guizhou,a cordycipitoid specimen was collected from a broad-leaved forest in Baiyunshan Scenic Area,Changshun county,Guizhou Province.Through isolation and purification,morphological examination,and phylogenetic analyses based on a five-locus dataset(nrSSU,nrLSU,tef-1 α,rpb1 and rpb2),the specimen was confirmed as a new species,and herein named Samsoniella longicatenata.Phylogenetic analyses reveal that S.longicatenata is closely related to S.coccinellidicola,S.guizhouensis,S.pupicola,S.simplicola,and S.tiankengensis.However,it can be clearly distinguished from these related species by its phialides that are solitary or opposite,lacking basal swelling,and conidia that are typically arranged in long chains(20-30 conidia per chain).In addition,a relatively comprehensive phylogenetic framework for the genus Samsoniella was reconstructed using a combined five-gene dataset,resolving five major phylogenetic clades within the genus.It is found that ITS sequences exhibit widespread haplotype sharing among different Samsoniella species.The discovery of S.longicatenata enriches the current knowledge on species diversity of Samsoniella from the karst forests of Guizhou.The genus-level phylogenetic framework established here demonstrates that ITS is unsuitable as a molecular marker for species identification and phylogenetic inference within this genus.Further studies on species diversity of Samsoniella in the karst forests of Guizhou are needful.