Boat-shaped in valve view; raphes on only one valve, the other valve lacking a central space between the striae; single cells may be enco...
Centric diatom (cells round in valve view, square to rectangular in girdle view). Often forms long filaments of cylindrical cells joined ...
Cells drum-shaped; radiating lines absent from valve face; may be joined weakly at the edges of the valves to form chains.
Boat-shaped in valve view, with prominent ribs (costae) running across the valve face, also visible in girdle view; single cells may be e...
Boat-shaped to elongate in valve face outline; striae meet edge of central sternum; although single cells may be encountered, presence of...
Cylindrical cells, round in valve view and square to rectangular in girdle view. Numerous discoidal golden-brown chloroplasts. Forms long...
Valve face outline is narrow and elongated, with a pronounced swelling in the middle and smaller swellings at the ends; striae meet the e...
![[Achnanthes], Lake Waihola, X640. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/achnanthes__FillMaxWzMwMCwyMDBd.jpg)
![[Aulacoseira], Lake Hayes, X640. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/aulacoseira__FillMaxWzMwMCwyMDBd.jpg)
![[Cerataulina], lower Taieri River, X160. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/cerataulina160__FillMaxWzMwMCwyMDBd.jpg)
![[Diatoma], X1000. Photo: Phil Novis, Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/diatoma_phil1000__FillMaxWzMwMCwyMDBd.jpg)
![[Fragilaria], Waiorau tarn, X640 Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/fragilaria640b__FillMaxWzMwMCwyMDBd.jpg)
![[Melosira], X1000. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/melosira3__FillMaxWzMwMCwyMDBd.jpg)
![[Tabellaria], upper Taieri River, X640. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/tabellaria__FillMaxWzMwMCwyMDBd.jpg)