Avramenko A.S., Cherepanova M.V., Georgiev A.A.
Phytotaxa 2026; 760(2): 138–148
The present paper describes the diatom species Aulacoseira khankaica sp. nov. based on detailed light and scanning electron microscopy observations. Its morphological features are compared with those of similar Aulacoseira species. The new species is described from the Middle Miocene sediments of the Khanka Basin, Primorsky Kray (Russian Far East). Aulacoseira khankaica is characterized by short chains joined by spatulate spines, straight rows of small areolae on the valve mantle, a narrow ringleiste and sessile rimoportulae located on the valve rim. The finding of A. khankaica provides additional information on the distribution of centric diatoms in the Middle Miocene.
