Landcare Research - Manaaki Whenua

Landcare-Research -Manaaki Whenua

Pinnularia segariana Foged

Pinnularia segariana; image by Cathy Kilroy (NIWA)

Type slide

Outflow from Ngongotaha Trout Hatchery, North Island, New Zealand. Foged Collection, New Zealand No. 506/1966, Natural History Museum, Denmark.

Institution holding the type material


Known distribution

In addition to the type locality, reported in a Juncus swamp between Taihape and Waiouru, North Island, New Zealand.


Dedicated to the New Zealand biologist E. C. M. Segar.


The valves are linear-lanceolate with faintly protracted, broadly rounded apices, 15-20 µm long and 5-6 µm broad. The axial area is lanceolate, the central area forms a rather broad transverse fascia. The raphe is straight with central nodules faintly deflected in the same direction, and the terminal fissures also deflected in the same direction. Transapical striae, 14-15 in 10 µm, are radiate towards the middle of the valve, but convergent towards the apices.

Description reproduced with kind permission of Koeltz Scientific Books.


Images published online with kind permission of the Natural History Museum of Denmark.

Funding from TFBIS (Terrestrial and Freshwater Biodiversity Information System), administered by the New Zealand Department of Conservation, is gratefully acknowledged.


Foged N 1979. Diatoms in New Zealand, the North Island. A. R. Gantner Verlag KG, Vaduz. 130 p.