Narrow and elongated in valve view, with slightly flaring ends; although single cells may be encountered, usually found in characteristic...
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...
Valve face outline is elliptical to cross-shaped; striae do not meet at sternum.
Valve face outline is narrow and elongated, with a pronounced swelling in the middle and smaller swellings at the ends; striae meet the e...
Valve face outline is elongated to needle-like; striae meet the edge of a narrow sternum; there is a central area lacking striae.
![[Asterionella], Lake Hayes, X320. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/asterionella__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)
![[Staurosira], X1000. Photo: Phil Novis, Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/staurosira_phil1000__FillMaxWzMwMCwyMDBd.jpg)
![[Tabellaria], upper Taieri River, X640. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/tabellaria__FillMaxWzMwMCwyMDBd.jpg)
![[Ulnaria], X320. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/ulnaria320b__FillMaxWzMwMCwyMDBd.jpg)