TY JOUR TI MORPHOLOGICAL VARIABILITY OF SOME WIDESPREAD AND RARE SPECIES OF THE GENUS NAVICULA (BACILLARIOPHYTA) KW Kilmez River (Udmurtia) KW phytobenthos KW Bacillariophyta KW Navicula KW morphology KW electron microscopy JO Transactions of Papanin Institute for Biology of Inland Waters RAS AU Genkal, S.I. AU Goskova, S.M. PY 2026 IS PB Papanin Institute for Biology of Inland Waters Russian Academy of Sciences