Bacillariophytina

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Mediophyceae

Valve outline bipolar or multipolar, sometimes (secondarily?) circular; valve pattern radiating from a central circular or elongate annulus; rimoportulae central or marginal; sexual reproduction oogamous; auxospore with band-like elements (properizonium) or scales; chloroplasts usually many, small. Chaetoceros, Cymatosira, Ditylum, Odontella, Skeletonema, Thalassiosira.

Bacillariophyceae

Valve outline almost always bipolar; valve pattern organized bilaterally about an elongate axial rib (sternum), as in a feather; rimoportulae generally only one or two per valve or none, sometimes accompanied (or replaced?) by special slits (the ‘raphe’) involved in motility; sexual reproduction morphologically isogamous (although sometimes with behavioural differentiation), involving gametangiogamy; auxospores usually with band-like elements in two series (transverse and longitudinal), forming a ‘perizonium’; chloroplasts usually only 1, 2 or a few and large, but sometimes many and small. Asterionella, Eunotia, Navicula, Nitzschia, Rhaphoneis.

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Ярославская обл., п. Борок, ИБВВ РАН

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