Golovneva, L., Zolina, A., Volynets, E., and Bugdaeva, E.
Biological Communications 2026; 71(2): 169-176
Two species of herbaceous angiosperms, Kuvshinia oleynikovii, gen. et sp. nov., and Kangauzia ussuriensis, gen. et sp. nov., are reported from the lower Albian Frentsevka Formation of southern Primorye, Russian Far East. They come from the autochthonous locality Bolshoy Kuvshin, comprising ferns and herbaceous angiosperms that were a part of a pioneer wetland open community occupying low flat plains between river channels. Kuvshinia oleynikovii is reconstructed as aquatic herbaceous submerged or partly emerged plant, with long curved flexible stem and alternate large petiolate, suborbicular to ovate leaves, with crenulate margin and pinnate brochidodromous venation. It probably grew in shallow, calmly flowing channels. Kangauzia ussuriensis was a small partly submerged plant with a shortened stem, thin roots and a rosette of several petiolate cordate leaves with crenate margin and actinodromous venation. Most likely, Kangauzia was a seedling. This plant could develop on flat plains between river channels or alongside slow-flowing streams and could be submerged or emerged depending on the periodically changing water level.
