Rotational symmetry of cell face outline is 360 degrees with one end broader than other, though may be only slightly; may be ~violin shap...
Rotational symmetry of cell face outline is 360 degrees ; one end is a reflection of the other (but the halves are not), i.e. semi-circul...
Rotational symmetry of cell face outline 180 degrees, one end is a reflection of the other, as are the two halves.
Rotational symmetry of cell face outline 180 degrees, with the ends being opposite reflections of each other.
![[Gomphoneis] on mucilaginous stalks, X640. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/gomphoneis2__FillMaxWzMwMCwyMDBd.jpg)
![[Cymbella], X400. Photo: Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/cymbella400__FillMaxWzMwMCwyMDBd.jpg)
![[Pinnularia], Tuakitoto outlet, X640. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/pinnularia__FillMaxWzMwMCwyMDBd.jpg)
![[Nitzschia], Kaikorai tributary, X400. Photo: Otago Regional Council & Manaaki Whanua](/assets/Tools-And-Resources/Identification/algae/nitzschia2__FillMaxWzMwMCwyMDBd.jpg)