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Common in poor quality streams, lowland rivers

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Diatoms

[Achnanthes], Lake Waihola, X640. Photo: Otago Regional Council & Manaaki Whenua

Achnanthes cf inflata (Achnanthaceae)

Chloroplasts visible inside cells are brown
[Cocconeis], Taieri River, X640. Photo: Otago Regional Council & Manaaki Whenua

Cocconeis placentula (Cocconeidaceae)

Central raphe
[Craticula molestiformis], X1000. Photo: Phil Novis, Manaaki Whenua

Craticula (Stauroneidaceae)

Central raphe
[Cymbella], X400. Photo: Manaaki Whenua

Cymbella (Cymbellaceae)

Rotational symmetry of cell face outline is 360 degrees; one end is a reflection of the other
[Eolimna], X1000. Photo: Phil Novis, Manaaki Whenua

Eolimna (Naviculaceae)

Central raphe
[Eunotia sepentina], north Taranaki, X400. Photo: Taranaki Regional Council & Manaaki Whenua

Eunotia and relatives (Eunotiaceae)

Rotational symmetry of cell face outline is 360 degrees; one end is a reflection of the other
[Fistulifera], X1000. Photo: Phil Novis, Manaaki Whenua

Fistulifera (Naviculaceae)

Central raphe
[Gomphoneis] on mucilaginous stalks, X640. Photo: Otago Regional Council & Manaaki Whenua

Gomphoneis (Gomphonemataceae)

Rotational symmetry of cell face outline is 360 degrees with one end broader than other
[Gyrosigma], Shag River, X400. Photo: Otago Regional Council & Manaaki Whenua

Gyrosigma (Pleurosigmataceae)

Rotational symmetry of cell face outline 180 degrees, with the ends being opposite reflections of each other
[Hantzschia], Lake Tuakitoto, X640. Photo: Otago Regional Council & Manaaki Whenua

Hantzschia (Bacillariaceae)

Rotational symmetry of cell face outline is 360 degrees; one end is a reflection of the other
[Melosira], X1000. Photo: Otago Regional Council & Manaaki Whenua

Melosira varians (Melosiraceae)

Chloroplasts visible inside cells are brown
Naviculoids, Waiwera River, X640. Photo: Otago Regional Council & Manaaki Whenua

Naviculoid diatoms (Naviculaceae)

Central raphe
[Nitzschia], Kaikorai tributary, X400. Photo: Otago Regional Council & Manaaki Whanua

Nitzschia (Bacillariaceae)

Rotational symmetry of cell face outline 180 degrees, with the ends being opposite reflections of each other
[Pinnularia], Lake Tuakitoto, X640. Photo: Otago Regional Council & Manaaki Whenua

Pinnularia (Pinnulariaceae)

Central raphe
[Planothidium], X1000. Photo: Phil Novis, Manaaki Whenua

Planothidium (Achnanthidiaceae)

Central raphe
[Rhoicosphenia], X1600. Photo: Otago Regional Council & Manaaki Whenua

Rhoicosphenia cf curvata (Rhoicospheniaceae)

Central raphe
[Sellaphora], X1000. Photo: Phil Novis, Manaaki Whenua

Sellaphora (Sellaphoraceae)

Central raphe
[Staurosira], X1000. Photo: Phil Novis, Manaaki Whenua

Staurosira (Fragilariaceae)

Raphe absent
[Tabellaria], upper Taieri River, X640. Photo: Otago Regional Council & Manaaki Whenua

Tabellaria flocculosa (Tabellariaceae)

Chloroplasts visible inside cells are brown
[Ulnaria], X320. Photo: Otago Regional Council & Manaaki Whenua

Ulnaria (Fragilariaceae)

Raphe absent