Navicula cryptotenella has wider valves and acute valve apices. Navicula cryptotenelloides has smaller valves and acute valve apices. Navicula recens is similar to N. eileeniae in the striae pattern in the central part of the valve where short and long striae alternate, but is larger and has coarser striae and areolae.
BioData Reference
Lange-Bertalot 2001 Pl 26 Fig 17-23
BioData Reference
Lange-Bertalot 2001 Pl 26 Fig 8-16