Konstantinova, N.A., A.A. Vilnet & Yu.S. Mamontov. 2022. How many taxa are in the genus Saccobasis H. Buch? Evidence from integrative taxonomy

Arctoa (2022) 31: 166–180

doi: 10.15298/arctoa.31.18

The genus Saccobasis is revised based on an integrative approach. The name S. polymorpha is synonymized with S. polita because neither molecular nor significant morphological differences were found between these taxa. At the same time, a group of Saccobasis specimens is proposed to be considered a new variety S. polita var. arctica as it forms a separate clade in constructed trees and differs morphologically from previously recognized taxa. Detailed descriptions of the species S. polita and its new variety are provided. The differences between Saccobasis and morphologically similar taxa, as well as the variability of the main features of the genus are considered. The characteristic features of S. polita var. polita and S. polita var. arctica are illustrated with photomicrographs, and the distribution of both taxa is pointed on a map.