Landcare Research - Manaaki Whenua

Landcare-Research -Manaaki Whenua

Achnanthes crosbyana Foged

Achnanthes crosybana

Type slide

Lagoon on the Coromandel Peninsula, North Island, New Zealand. Foged Collection, New Zealand No. 487/1966, Natural History Museum, Denmark.

Institution holding the type material


Known distribution

Coromandel, North Island, New Zealand.


Dedicated to the New Zealand biologist L. H. Crosby.


Valves broadly lanceolate with rostrate apices, 20-45 µm long and 8-14 µm broad. The raphe valve has a straight raphe, a narrow lanceolate axial area, and a fairly broad asymmetrical central area. 12-14 radiate transapical striae in 10 µm. The rapheless valve has a narrow lanceolate axial area, in the middle of the valve somewhat dilated in an asymmetrical central area. 10-14 radiate transapical striae in 10 µm.

Description reproduced with kind permission from Koeltz Scientific Books.


Images displayed 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.


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