Resting spores. Lugol sample (BF)
Life-form: Cells united in chains, pelagic or on ice
Size: Diameter: 10-50 µm
Resting spore: +
Note: The Baltic material is referred to a special form or variety (Syvertsen & Hasle 1988)
Distinctive features: Collar close to valve apex
Similar species:
Distribution: Arctic, Oslofjorden, Gullmarsfjorden, Baltic
Literature:
Hasle, G. R. & Syvertsen, E. E. 1996. Marine diatoms. In: Tomas,
C. R. (ed.) Identifying marine diatoms and dinoflagellates. Academic
Press, Inc., San Diego, p. 5-385.
Heimdal, B. R. 1973. The fine structure of the frustules of Melosira nummuloides and M. arctica (Bacillariophyceae). Norw. J. Bot. 205: 139-149.
Syvertsen, E. E. & Hasle, G. R. 1988. Melosira arctica in the Baltic Sea and in the Oslofjord (a preliminary note). USDQR Report 12: 79-84