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Eolimna (Naviculaceae)

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Diagnostic features

Valves identical, both possessing a raphe (i.e. the genus is biraphid).  Frustules oval in valve view, less than 20µm in length (very small), although a range of lengths may occur.  Central area "bow tie" shaped. Chloroplasts golden brown, parietal, lying against the edges of the valve. May be difficult to distinguish from Sellaphora.

[Eolimna], X1000. Photo: Phil Novis, Manaaki Whenua Image
Eolimna, X1000. Photo: Phil Novis, Manaaki Whenua

Typical habitats

The specimens photographed were from a lowland river

Classification

Kingdom Chromista
Phylum Ochrophyta
Class Bacillariophyceae
Order Naviculales
Family Naviculaceae
Common name Diatoms