Aulacoseira nivalis

(W.Sm.) English and Potapova 2009      Category: Centric
BASIONYM: Melosira nivalis W.Sm. in Grev. 1855
SYNONYM(S): Aulacoseira  distans var. nivalis (W.Sm.) E.Y.Haw. | Melosira  distans var. nivalis  (W.Sm.) Kirchner 
REPORTED AS: Aulacoseira  pfaffiana  ((Reinsch) Krammer 1991) 

Aulacoseira muzzanensis


Aulacoseira nivaloides

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova | Jonathan English - January 2011
Diameter: 6-18 µm
Mantle Height: 2.5-6 µm
Rows of areolae in 10 µm: 12-16


Frustules are cylindrical and form short chains. Valves are 6-18 µm in diameter, with a mantle height of 2.5-6 µm. The ratio of the mantle height to valve diameter is usually less than 1, so the valves are often observed in valve view. The mantle has straight sides and the valve face is flat. Rows of mantle areolae are straight, slightly inclined to the right (dextrorse), 12-16 in 10 µm, with 2-6 elongated areolae in each row. The height of the collum is approximately 1/3 of the mantle height. The valve face is covered by large areolae, 0.5-0.9 µm in diameter. The spines are pointed and narrow with anchor-shaped ends, and originate from every pervalvar costa. The ringleiste is very shallow. There is one rimoportula on the mantle near the ringleiste.

Original Description

Basionym: Melosira nivalis
Author: W.Sm. in Grev. 1855
Diameter: 5-18 µm
Rows of areolae in 10 µm:

Original Description

Frustules subcylindrical; valves sub-hemispherical,• distinctly cellulate; cellules circular; extremities of valves more or less truncate. Breadth of filament •0002” to •0007”. v.v.

Original Images

Cite This Page:
Potapova, M., and English, J. (2011). Aulacoseira nivalis. In Diatoms of the United States. Retrieved April 26, 2018, from

Species: Aulacoseira nivalis

Contributor: Marina Potapova | Jonathan English

Reviewer: Sarah Spaulding


English, J. and Potapova, M. (2009). Aulacoseira pardata sp. nov., A. nivalis comb. nov., A. nivaloides comb. et stat. nov., and their occurrences in Western North America. Proceedings of the Academy of Natural Sciences of Philadelphia 158(1):37-48. 10.1635/053.158.0102

Greville, R.K. (1855). Report on a collection of Diatomaceae made in the district of Braemar by Professor Balfour and Mr. Gerge Lawson. Annals and Magazine of Natural History, 2nd series, 15:252-261.

Haworth, E.Y. (1988). Distribution of diatom taxa of the old genus Melosira (now mainly Aulacoseira) in Cumbrian waters. In: Round, F.E. (ed.), 1988, Algae and the aquatic environment. Contributions in honour of J.W.G. Lund. Biopress Ltd., Bristol, pp. 138-167.

Tuji, A. (2010). Examination of type material of Melosira nivalis W.Sm. (Bacillariophyceae) and its synonymy with Aulacoseira pfaffiana (Reinsch) Krammer. Bull. Natl. Mus. Nat. Sci. ser. B. 36.

Tuji, A. and Williams, D.M. (2006). Examination of type material for Aulacoseira pfaffiana (Bacillariophyceae) with special reference to the position of its rimoportula. Bull. Natn. Sci. Mus., Tokyo, Ser. B, 32(3), pp. 117–121.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID: 10065

Autecology Discussion